UK Power Networks
DSR 01 005
v4.0
Work On Customer HV Systems
Owner
Name
Peter Vujanic
Title
Head of Health, Safety and Environment
Signature
01 May 2016
Date
Authoriser
Name
Dudley Sparks
Title
Operational Safety Manager
Signature
01 May 2016
Date
This document forms part of the UK Power Networks Integrated Management System and
compliance with its requirements is mandatory. Departure from these requirements may only be
taken with the written approval of the above authoriser.
Revision Record
Version number
4.0
Date published
01/05/2016
Next review date
07/03/2019
Prepared by
D Daintree
What has changed?
Owner name changed, change of name of the HV Consumers Plant Authority
form to HV Consumers Apparatus Authority. Introduction and Purpose and
the Scope have been changed to highlight control functions. Additional
paragraph in section 9.2 highlighting when testing is required by a customer
on their network. Removal of references to regional variations in Introduction
and Purpose
Why has it changed?
Full review for the new 2016 DSRs.
Revision Record
Version number
3.0
Date published
09/10/2015
Next review date
21/06/2018
Prepared by
N. Saunders
Version number
2.0
Date published
16/07/2015
Next review date
21/06/2018
Prepared by
D. Daintree
What has changed?
Added appendices 11 and 12 (example forms) and reference to unregulated
form number
Why has it changed?
Additional information for staff.
What has changed?
Change of authoriser
Why has it changed?
Previous authoriser left company.
This printed document is valid at 31/07/17 check after this date for validity.
Page 1 of 13
UK Power Networks
DSR 01 005
v4.0
Who needs to know?
☐ All UK Power Networks Staff
☒ Asset Management
☒ Capital Programme
☒ Connections
☒ Contractors
☒ Customer Services
☐ Finance
☒ G81 External website
☐ HR & Communications
☒ HSS&TT
☒ In Business HSS
☒ Safety Reps
☒ ICP’s (Independent Connection Providers)
☒ IDNO’s (Independent Distribution
Network Operators)
☐ Information Systems
☒ Meter Operators
☒ Network Operations
☒ EPN
☒ LPN
☒ SPN
☒ Commercial Services
☐ Logistics
☒ Network Control
☒ Network Operations Connections
☐ Transport Services
☐ Strategy and Regulation
☒ UK Power Networks Services
☒ Airports
☒ HS1, DLR & Commercial buildings
☒ MUJV / Allenby
☒ Projects & Business Development
☐ Others (specify)
Contents
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
Introduction and Purpose ............................................................................................ 3
Scope ............................................................................................................................. 3
Objective ....................................................................................................................... 3
References .................................................................................................................... 3
Definitions ..................................................................................................................... 4
Responsibilities ............................................................................................................ 5
Records ......................................................................................................................... 5
General Provisions ....................................................................................................... 5
Ownership/work Scenarios .......................................................................................... 7
Superseded Documents ............................................................................................... 9
Appendix A – Example of Consumer’s Apparatus Authority .................................. 10
Appendix B Example of HV Operational Isolation and Earthing Certificate ........... 11
Appendix C – Forms in Use and Availability............................................................. 13
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UK Power Networks
DSR 01 005
v4.0
1.0 Introduction and Purpose
This document details the procedures to be followed when work and/or operations are
undertaken by UK Power Networks’ staff on a network not controlled by UK Power
Networks.
It also covers situations where a Customer requires isolation of the supply from the UK
Power Networks system to enable them to carry out work on their own apparatus.
2.0 Scope
This Procedure details the actions to be taken under the following circumstances:

Work and/or operations are to be carried out on a Customer’s HV equipment by UK
Power Networks personnel or Contractors, at the Customer’s request.

Isolation and Earthing of UK Power Networks equipment is required to enable the
Customer to carry out work on their own equipment.

Isolation and Earthing of the Customer’s HV equipment is required to enable work on
equipment owned by UK Power Networks.
The arrangements for the operation of the Customer’s HV equipment and for the operation
of UK Power Networks’ equipment at the interface is set out in the Site Responsibility
Schedule (SRS) that should be in place for all HV Customer supplies.
Where a contract exists for UK Power Networks personnel to undertake control, operate
and maintain the Customer’s HV Network on their behalf, this procedure does not apply.
3.0 Objective
The objective of this procedure is to ensure that all operations and work on, or adjacent to,
a high voltage interface, or on the Customer’s private HV network are undertaken in line
with current Distribution Safety Rules and relevant legislation.
4.0 References
DSRs
Distribution Safety Rules
Ofgem
Distribution Code
Electricity at Work Regulations
Electricity Safety, Quality and Continuity Regulations 2002, as
amended (2006)
National Grid
Grid Code
NOP 10 015
HV Site Responsibility Schedules
HSS 01 061
Task Risk Assessment
HSS 01 062
Undertaking On-site (Point of Work) Assessment
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Page 3 of 13
UK Power Networks
DSR 01 005
v4.0
HSS 01 069
Personal Protective Equipment (PPE)
GOP 13
Generic Task Risk Assessment HV & EHV Switching – Ground
Mounted
GOP 17
Generic Task Risk Assessment HV Switching - Overhead
5.0 Definitions
UK Power
Networks network
The electricity network owned by UK Power Networks and normally
operated by UK Power Networks authorised personnel
Customers
Network
An HV electricity network not owned by a Distribution Network
Operator (DNO) and receives an HV supply from a DNO
Site Responsibility
Schedule
A document defining the ownership of equipment and apparatus at
the boundary between a DNO and other networks. It also specifies
which party is responsible for controlling & operating switchgear,
maintenance and issuing documents
Operation &
Maintenance
Agreement
A contractual agreement in place with a customer where UK Power
Networks agrees to operate and maintain their electrical HV/LV
distribution network
HV Consumer
Apparatus
Authority (CAA)
A document signed by the customer which gives authority to a
nominated authorised person to carry out operations, work/and or
control on consumer’s apparatus
A certificate designed to provide written confirmation of isolation
and/or earthing where:
(i)
UK Power Networks authorised personnel request the
Customer’s authorised personnel to carry out switching
operations on Customer’s switchgear to isolate and/or
earth equipment to be worked on;
(ii)
the Customer’s authorised personnel request UK Power
Networks authorised personnel to carry out switching
operations on UK Power Networks equipment or
Customer’s switchgear to isolate and/or earth
apparatus.
or
HV Operational
Isolation and
Earthing (OIE)
Certificate
The OIE Certificate includes sections for either party to request the
isolation and earthing operations and receive written confirmation
of completion, before accepting the circuit. The relevant sections
of the certificate must be completed and the certificate cleared and
cancelled before the equipment is returned to service.
The OIE Certificate is not an authority for UK Power Networks to
operate the customer’s HV equipment, or vice-versa, other than to
operate earth switches to facilitate testing. All other operations
require a written agreement as set out in Section 8.2 of this
procedure
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UK Power Networks
DSR 01 005
v4.0
6.0 Responsibilities
The ownership of any system, plant or equipment generally determines the responsibility for
its control. This will normally be defined in the Site Responsibility Schedule required by the
Distribution Code, which should be in place for all Customer HV supplies (refer to
NOP 10 015).
It is the responsibility of the DNO to ensure that a written agreement has been prepared
and signed by each party involved for each site where work or operations are to be carried
out by UK Power Networks personnel on a Customer’s HV electricity network (see section
8.2 below).
The agreement shall include the Site Responsibility Schedule and a diagram showing the
relationship between the Customers HV Network and the local DNO’s network. All points of
isolation shall be shown, irrespective of voltage. The Schedule and diagram shall be
checked and confirmed by the relevant UK Power Networks Senior Authorised Person as
up to date before any operations or work are carried out on the equipment.
This agreement shall define the extent of any authority of UK Power Networks personnel to
carry out work or operations on the Customer’s HV electricity network.
The customer should provide sufficient records for the safe operation of the equipment such
as network drawings and maintenance records.
Where UK Power Networks are requested, in un-planned or fault situations, to carry out
work on Customer-owned equipment the above mentioned agreement (see Para. 6.2) may
not exist or may not be available. In this case, the UK Power Networks representative shall
collect and physically check information about the network to enable the later completion
and signing of an agreement. A Customer Apparatus Authority form (or equivalent) shall
be signed by the Customer, who shall also provide a written indemnity for UK Power
Networks personnel to operate the Customer’s equipment (see Appendix A).
7.0 Records
UK Power Networks shall provide a Substation Log Book at HV substations that provide a
supply to HV Customers, in which all instances of entry into, operations and work in the UK
Power Networks substation shall be recorded.
A Site Responsibility Schedule is provided for all relevant sites, as described above.
8.0 General Provisions
8.1
Authorisation from UKPN for UKPN staff to work on or operate Customers’
Equipment
8.1.1 Due to the additional risks involving customers’ equipment, the person
carrying out switching operations, or receiving or issuing an HV Operational Isolation
and Earthing Certificate, or receiving an HV Consumer’s Apparatus Authority (CAA)
safety document shall be a Senior Authorised Person (SAP).
8.1.2 UKPN staff appointed as Competent, Authorised or Senior Authorised may
carry out the same (but not extend) their permitted activities/duties on a customer’s
system, except for the limitation stated in 8.1.1 above.
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UK Power Networks
DSR 01 005
v4.0
8.1.3 Staff appointed as Competent or Authorised shall only work on a
Customer’s system under safety documentation issued by a UKPN appointed Senior
Authorised Person.
8.2
Authority from the Customer for UKPN staff to work on or operate Customer’s
Equipment
Before UK Power Networks’ staff can begin operations or work on Customer-owned
apparatus and equipment, the customer’s written authority shall be obtained.
Such an authority may be given in various forms, for example

The schedule of Operation and Maintenance Agreement

Specific contract

HV Consumer’s Apparatus Authority (CAA)
The customer must also indemnify UKPN staff against accidental damage or injury, in
writing (see Appendix A).
8.3
Rules
Work and operations undertaken by UKPN personnel on a Customer’s HV system, must as
far as is reasonably practical, be in accordance with UK Power Network’s Distribution
Safety Rules and all other applicable UKPN operating procedures, unless agreed
otherwise in writing.
In circumstances where UK Power Networks staff are required to work in accordance with
any other companies' safety rules/procedures the requirements are listed in the DSRs
under section 1.2.
8.4
Objection
The UK Power Networks SAP shall have the final decision on whether to operate the
Customer’s switchgear. In the absence of adequate knowledge or proof of adequate
maintenance, additional precautions shall be taken before operating the Customer’s
switchgear. These may include using a Remote Operating Device (ROD) if the customer
consents, or requiring the switchgear to be made dead before operation.
8.5
Inspection of Safety Standards
When operations are carried out on equipment controlled by the customer, the UK Power
Networks’ SAP must accompany the customer’s Authorised Person and satisfy himself that
the isolation and earthing of the equipment has been carried out to the standards required
by UKPN Distribution Safety Rules.
When operations are carried out on equipment controlled by UKPN for the customer, the
customer’s authorised person should be invited to accompany the UK Power Networks’
SAP during the switching operations.
8.6
Use of Switchgear Locks and Safety Locks

On equipment operated by the customer, the customer’s authorised person will apply
his safety locks at each point of isolation from supply.

On equipment operated by UK Power Networks, the UK Power Networks’ SAP will
apply his safety locks at each point of isolation from supply.
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UK Power Networks
DSR 01 005
v4.0

In both cases, the safety lock keys shall be secured in a joint key safe if provided or
available. One unique key safe locking key shall be held by the Customer’s AP and
another shall be held by the UK Power Networks SAP. Alternatively, a similarly
secure system shall be used to ensure that the points of isolation cannot be removed
without the knowledge and consent of both parties.

The keys to locks securing Circuit Main Earth points shall normally be retained by the
person who is to supervise the work.
8.7
Before Work is commenced by UKPN staff
In addition to the requirements above, the following are also required before starting work
on customer’s equipment
9.0

Written instruction from the customer

Risk assessments in accordance with HSS 01 061 and HSS 01 062

The right PPE for the work being undertaken (HSS 01 069)
Ownership/work Scenarios
9.1
Work on Customer’s Equipment by UKPN Personnel
Where a current Operation and Maintenance (O&M) agreement is in place for a piece
of apparatus, all work and operations shall be carried out as if the apparatus were part
of UK Power Networks’ network.
Where work is taking place under a specific contract or CAA (i.e. there is no O&M
agreement), the operations and work carried out does not need to be recorded by
Network Control, however shall be recorded on an HV Switching Schedule which will
be prepared prior to commencing the works (see appendix A).
If work is taking place in the UK Power Networks area, Network Control will be
informed before work starts.
9.1.1
Customer-controlled Switchgear to be operated by the Customer

The UKPN Senior Authorised Person (SAP) shall complete the relevant parts of
the OIE Certificate and return it to the Customer’s Authorised Person (AP).

The Customer’s AP shall then proceed with the isolation and earthing of their HV
equipment. The UKPN SAP shall accompany the Customer’s AP and satisfy
himself that the isolation and earthing of the equipment has been carried out in a
manner commensurate with the UK Power Networks Distribution Safety Rules.

The Customer’s AP shall then apply his own safety locks at each point of Isolation.
The safety lock keys will be secured as detailed in section 8.6 above.

The UK Power Networks SAP shall ensure suitable Caution and Danger notices
are applied in accordance with the UK Power Networks Distribution Safety Rules.

The Customer’s AP shall then complete the relevant sections of the OIE
Certificate to confirm the requested operations have been completed, and return it
to the UK Power Networks’ SAP, who shall acknowledge receipt by signing the
form in the appropriate place.
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UK Power Networks
v4.0

The UK Power Networks SAP shall then issue the appropriate UK Power
Networks safety document(s) in accordance with the UK Power Networks
Distribution Safety Rules. If all other requirements of this procedure have been
met, work may then proceed.

On completion of the work, the safety document(s) shall be cleared and cancelled
in accordance with the UK Power Networks Distribution Safety Rules.

After the safety documents have been cleared and cancelled, the UK Power
Networks SAP shall complete the section of the OIE Certificate which confirms
cancellation of the certificate and return it to the Customer’s AP, along with any
appropriate operational keys.
9.1.2
9.2
DSR 01 005
Customer-controlled Switchgear to be operated by UKPN personnel

The SAP must ensure that all the requirements of section 8 of this document are
satisfied.

The UK Power Networks SAP shall then operate the Customer’s switchgear and
apply his own Safety Locks and Caution/Danger notices in accordance with the
UK Power Networks Distribution Safety Rules and Procedures. An OIE
Certificate is not required under these circumstances.

Work on the equipment shall then proceed under the UK Power Networks
Distribution Safety Rules, using the appropriate UK Power Networks safety
document(s).
Work by the Customer requiring operation of UK Power Networks equipment

Where a Customer wants to carry out work on their own equipment, which can be
energised from equipment controlled by UK Power Networks, the Customer shall
request isolation and earthing using an OIE certificate and return it to the UK
Power Networks SAP.

The UK Power Networks SAP shall then proceed with the isolation and earthing of
the UK Power Networks owned equipment. The Customer’s AP shall be invited to
accompany the UK Power Networks SAP during the switching operations.

The UK Power Networks SAP shall apply his Safety Locks at each point of
Isolation on the UK Power Networks switchgear in the normal manner. Unless
otherwise agreed in the Site Responsibility Schedule there shall be no dual locking
of UK Power Networks switchgear. The safety lock keys will be secured as
detailed in section 8.6 above.

The UK Power Networks SAP shall then confirm completion of the request using
the OIE Certificate and return it to the Customer’s AP who shall acknowledge
receipt by signing the form in the appropriate place. The Customer may then
proceed with the work on their own equipment, using their own safety rules and
documentation.

When testing is required by a customer on their network the Earth may be
removed/re-applied under the supervision of an UK Power Networks SAP as per
section 2B of the OI&E document
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Page 8 of 13
UK Power Networks

9.3
9.4
v4.0
On completion of the work, the Customer’s AP shall complete the section of the
OIE Certificate which confirms cancellation of the certificate and return it to the UK
Power Networks SAP, along with any appropriate operational keys.
Equipment which requires isolation from both UK Power Networks switchgear,
and from switchgear owned by the Customer.

Where the equipment to be worked on requires isolation both from UK Power
Networks controlled switchgear, and from switchgear controlled by the Customer,
the UK Power Networks SAP and the Customer’s AP must work in close liaison to
isolate and earth their respective equipment in accordance with Sections 9.1 and
9.2 of this procedure.

HV Operational Isolation and Earthing Certificates shall be issued by either the
Customer’s AP or the UK Power Networks SAP, depending on which party is to
carry out the work. If work is to be carried out by both UK Power Networks and
the Customer then all OIE Certificates shall be cross-referenced by both parties.
As detailed in Section 8.5, the UK Power Networks SAP shall satisfy himself
that the Customer’s HV switchgear has been isolated and earthed in the
correct manner. The safety lock keys will be stored as described in section
8.6 above.

10.0
DSR 01 005
It is essential that the UK Power Networks SAP and the Customer’s AP continue
to liaise closely during the works, and discuss and agree the vital operational
points in the procedure. All OIE Certificates shall be completed and cancelled
before any equipment is returned to service.
Superseded Documents
LPN COP4
OI G10/- Work on Customer’s High Voltage Equipment
V12/S3/14 Work by Engineers on HV Systems not owned by Eastern Electricity
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Page 9 of 13
UK Power Networks
11.0
DSR 01 005
v4.0
Appendix A – Example of Consumer’s Apparatus Authority
Front
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Page 10 of 13
UK Power Networks
12.0
DSR 01 005
v4.0
Appendix B Example of HV Operational Isolation and Earthing Certificate
Front
OPERATION, ISOLATION AND EARTHING CERTIFICATE: .......................................... Number: .............................................
Substation: ...................................................... Circuit to be Worked on: ............................................
This Document is NOT a Permit-to-Work or Sanction-for-Test
1. ISOLATION
1A. Request
To: ............................................................................................................................................................................................
Please isolate the following apparatus: ......................................................................................................................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Requester’s Name: .................................................................... Job Title: ...............................................................................
Time: ............................................. Date: .................................. Signature: .............................................................................
1B. Issue
Issued to: ................................................................................. UK Power Networks Authorised Person/Customers Authorised I
hereby confirm that the following apparatus has been isolated/and locked off
Points of isolation are: ...............................................................................................................................................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Issued with the consent: ....................................................UK Power Networks Control Engineer/Customers Control Operator
Signed: ........................................ ....................being a UK Power Networks Authorised Person/Customers Authorised Person
Time: ........................................................... Hours Date: ......................................................................................................
2. EARTHING
2A. Request
To: ............................................................................................................................................................................................
Please earth the following apparatus: ........................................................................................................................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Requester’s Name and Job Title: ..............................................................................................................................................
Time: ............................................. Hours Date: ....................... Signature: .............................................................................
2B.
Issue
Issued to .... ......................................................being a UK Power Networks Authorised Person/Customers Authorised Person
..................................................................................................................................................................................................
I hereby confirm that the following apparatus has been earthed
Points of Earthing are: ..............................................................................................................................................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
All work will be undertaken by competent people under a suitable safe system of work.
If the earth(s) are to be removed this must only be under the supervision of UK Power Networks Authorised Person/Customers
Authorised Person.
Issued with the consent of: ................................................UK Power Networks Control Engineer/Customers Control Operator
Signed: ... .........................................................being a UK Power Networks Authorised Person/Customers Authorised Person
Time: ........................................................... Hours Date: ......................................................................................................
UPN1010
3. RECEIPT
I hereby acknowledge receipt of this certificate and Key: ..........................................................................................................
Signed: ........................................................ being a UK Power Networks Authorised Person/Customers
Authorised Person Time: ........................................................... Hours Date:
......................................................................................................
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UK Power Networks
DSR 01 005
v4.0
Back
1.
RETURN & CANCELLATION
I here by declare that all relevant Permits-to-Work and Sanction’s for Test issued on behalf of UK Power Networks/Customer
are now cancelled and all additional earths and staff under my control have been withdrawn.
The operational state of the apparatus is the same as detailed in 2B with the following exceptions (if none state none)
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Signed: ......................................................... being the UK Power Networks/Authorised Person/Customers Authorised Person
Person: .....................................................................................................................................................................................
Time: ........................................................................ Date: .....................................................................................................
I hereby declare that this certificate is now cancelled
Signed: ........................................................ .being the UK Power Networks Authorised Person/Customers Authorised Person
Cancelled with the consent of: ...........................................UK Power Networks Control Engineer/Customers Control Operator
Time: ........................................................................ Date: .....................................................................................................
2. REMOVAL OF EARTHS
5A. Request
To: ............................................................................................................................................................................................
Please remove earths from the following apparatus: .................................................................................................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Points of Earthing are: ..............................................................................................................................................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Requester’s Name: .................................................................... Job Title: ...............................................................................
Time: ............................................. Date: .................................. Signature: .............................................................................
5B. Confirm
Issued to .......................................................... being a UK Power Networks Authorised Person/Customers Authorised Person
I hereby declare that the earths have been removed from the following apparatus: ...................................................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Confirmed with the consent of: ..........................................UK Power Networks Control Engineer/Customers Control Operator
Signed: ......................................................... being the UK Power Networks Authorised Person/Customers Authorised Person
Time: ........................................................................ Date: .....................................................................................................
3. RE-ENERGISING
6A. Request
To: ............................................................................................................................................................................................
Please remove the safety locks and energise the following apparatus: ......................................................................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Requester’s Name: .................................................................... Job Title: ...............................................................................
Time: ............................................. Date: .................................. Signature: .............................................................................
6B. Confirm
I hereby confirm that the locks have been removed and the following apparatus has been energised .......................................
..................................................................................................................................................................................................
..................................................................................................................................................................................................
Re-energised with the consent of: .................................................................................. UK Power Networks Control Engineer
Signed: ..........................................being a UK Power Networks Company’s Authorised Person/Customers Authorised Person
Time: ........................................................................ Date: .....................................................................................................
4. COMPLETION
I hereby confirm that all switching associated with this document is now complete
Signed: ......................................................... being the UK Power Networks Authorised Person/Customers Authorised Person
Time: .......................................................................... Date: ...................................................................................................
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UK Power Networks
13.0
DSR 01 005
v4.0
Appendix C – Forms in Use and Availability
HV Consumer’s Apparatus Authority (CAA)
Office Depot (ref UPN 9016)
HV Operational Isolation and Earthing (OIE)
Certificate
Office Depot (ref UPN1010)
Site Responsibility Schedule
refer to NOP 10 015
HV Switching Schedule template
NOP 60 004a (EPN)
NOP 80 038 a & b (SPN)
Indemnity
See below
Standard Form of Indemnity
It is part of the terms of the arrangement (insert reference) that you shall indemnify UK
Power Networks against any claims which may be made against UK Power Networks in
respect of damage to property whether belonging to you, UK Power Networks, or third
parties and also you shall indemnify UK Power Networks in respect of any claims arising out
of injury to any persons whether they are your employees, or employees of UK Power
Networks or injuries to persons who do not fall into either of the preceding classes except
where negligence on the part of UK Power Networks is admitted by UK Power Networks or
can be proved against UK Power Networks.
If the arrangement referred to above comes into operation, then it is a term and condition of
that arrangement that the indemnity referred to in the preceding paragraph shall come
immediately into effective force and operation.
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