THIS IS A DESIGN GUIDE NOT A SPECIFICATION
Montgomery County Public Schools Facilities Guide
DIVISION 16 – ELECTRICAL
SECTION 16140
WIRING DEVICES
PART 1 – GENERAL
A. Provide a dedicated 20 amp, 208 volt, single phase circuit with a NEMA 6-20R, 20 amp, 208
volt, single phase receptacle for copiers in the Main Office Workroom and in the Media
Center Workroom.
B. Provide NEMA 5-20R duplex receptacles. Device color:
1. Normal – Ivory
2. Emergency – Red
3. Data – Gray with gray device plate
C. Standard receptacle color shall be ivory. Standard device plate color shall be ivory crackle
type.
D. Acceptable manufacturers – Pass & Seymour, Hubbell/Bryant and Leviton.
E. Provide the Command Center with emergency power receptacle, telephone outlet, data outlet
and PA system microphone. Command Center to be located by MCPS.
F. For every radon system pipe, provide a GFCI/weatherproof 20 amp receptacle located on
roof for radon equipment. Locations as selected by the Architect.
G. Installation detail for receptacles located on roof. See Standard Detail E-8.0 on following
pages.
H. For Standard Classroom Front Wall Data and Power arrangement. See Standard Detail E-9.0
on following pages
I.
For Standard Teacher’s Station TV/Data/Voice/Power detail. See Standard Detail E-10.0 on
following pages
J.
Goggle Cases require 200 watts. Multiple cases can be connected to one circuit.
K. Provide a duplex receptacle on each landing of each stair.
L. Kitchen - Provide a push button at the loading dock door connected to a buzzer in the kitchen
office.
M. Kitchen Hood
1. Provide shunt trip circuit breaker for any electrical equipment located under the hood and
connected to the hood fire suppression system.
2. If there is gas feed equipment under the hood, connect gas solenoid valve to the hood
fire suppression system to shut off gas.
N. Kitchen – Provide GFCI receptacles except for refrigerators and freezers.
O. Provide mushroom push button for emergency power shut-off for Elementary and Middle
Schools in the following areas:
1. Boiler Room
2. Tech Lab
P. Provide mushroom push button for emergency power shut-off for High Schools in the
following areas:
1. Boiler Room
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THIS IS A DESIGN GUIDE NOT A SPECIFICATION
2. Applied Tech Center
3. Engineering Research & Design Center
4. All Science Rooms
5. Food Sciences Room.
Q. In Elementary and Middle Schools, Provide two NEMA 14-50R receptacles for kilns. Provide
a two pole 50 amp circuit breaker with 3# 6 + 1 #8 ground in 1” conduit. Interlock exhaust fan
with kiln switch. See Kiln Wiring Diagram. Standard Detail E-11.0 on following pages.
R. In High School Art Rooms, provide four NEMA 14-50R receptacles for kilns. Provide a two
pole 50 amp circuit breaker with 3# 6 + 1 #8 ground in 1” conduit. Interlock exhaust fan with
kiln switch. Similar to Kiln Wiring Diagram. See Standard Detail E-12.0 on following pages.
PART 2 – RECEPTACLE LAYOUT GUIDELINES
A. Before locating the power receptacles, check architectural drawings for type of wall
construction, such as drywall and masonry, and make sure that there are no conflicts with
other equipment. The outlets boxes shall be symmetrically located according to room layout
and shall not interfere with other work or equipment. Also, show any special outlet design
details on the drawing.
B. All receptacles and outlet boxes shall be flush-mounted in walls and floors unless they have
to be surface mounted due to wall or floor construction type. Outlets located outdoors or in
damp locations shall be weatherproof (GFCI) type. All receptacles located within 6'of sink
shall be GFCI type. Wall mounted receptacles and outlet devices shall be mounted 18" above
finished floor or 6" above countertops. When receptacles are mounted in masonry walls, the
top of the outlet box shall be in line with the top of a masonry unit (16” above finished floor).
All receptacle outlet boxes must be equipped with ground terminal for green bond ground
wire. Floor outlets shall be flush-floor type (except in kitchen) with brass cover and lift-up lids.
C. The following criteria shall be used to layout receptacles outlet boxes for different areas:
1. Classrooms - Provide two (2) duplex receptacles on each wall 2 minimum 12 feet apart.
Also provide five (5) duplex receptacles with orange cover plates for computers; of these,
four (4) shall be mounted on the back wall and one (1) on the front wall. Provide one (1)
separate dedicated circuit for the five (5) computer duplex receptacles. DO NOT provide
clock outlet because battery-pack type clocks will be provided by MCPS, except provide
two (2) clock hanger outlets one on each section of gymnasium. Kindergarten and Pre
Kindergarten: All receptacles mounted 16” to the top of receptacle shall be GFCI type or
be connected to a GFCI circuit breaker.
2. Administration - In each administrative office provide one (1) duplex receptacle on each
wall. In the General Office provide one (1) duplex receptacle every 12 ft. along the walls
and a floor mounted (flush) combination outlet of quadruplex receptacle and telephone
outlet for main counter. Provide a duplex receptacle and telephone outlet for each desk.
Provide a dedicated 20 amp, 208 volt, single phase circuit with a NEMA 6-20R, 20 amp,
208 volt, single phase receptacle for copiers in the Main Office Workroom and in the
Media Center Workroom. Provide one (1) duplex receptacle with dedicated circuit to
emergency panel for sound system console. In health suite, provide two (2) duplex
receptacles above sink counter, one (1) dedicated circuit, duplex receptacle for
refrigerator, one (1) duplex receptacle near each cot in resting station, and one (1) duplex
receptacle near the nurse'
s station.
3. Corridors - Provide one (1) duplex receptacle every 50'for utility purposes. Provide
dedicated circuit for corridor receptacles. Provide maximum two (2) receptacles per
circuit.
4. Multipurpose Room - Provide one (1) duplex receptacle every 16'along perimeter walls.
In the stage area, provide a minimum of one (1) duplex receptacle on each side wall.
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THIS IS A DESIGN GUIDE NOT A SPECIFICATION
5. Kitchen - Provide power for the kitchen equipment as per kitchen equipment
manufacturer'
s requirements. Before laying out these receptacles and connections,
coordinate locations with kitchen equipment layout. In addition, provide additional
convenience duplex receptacles on each wall. Provide one (1) duplex receptacle above
each walk-in freezer and refrigerator. Provide emergency power for each walk-in freezer
and refrigerator. Provide 3/4" empty conduit from each cash register outlet to nearest wall
to ceiling space for future data network system. Provide a push button at the kitchen
loading dock door connected to a buzzer in the kitchen office. Provide necessary service
for Kiosk (high school only) as required.
6. Gymnasium - provide one (1) duplex receptacle every 20'along perimeter walls. The
locations for these receptacles should be coordinated with bleachers as well as paddling.
Provide one (1) junction box with a single pole-20 amp circuit for a scoreboard and shot
clocks. Controls for all electrically operated basketball backstops shall be located at one
location in a recessed, key operated box. For folding partition, controls shall be provided
on each side of partition and it is to be controlled by two individual at a time, (OSHA
requirement). Provide a junction box and receptacle for scoring table next to partition
housing.
7. Toilets - Provide one (1) GFCI type duplex receptacle near wash basin in every staff
toilet. Do not provide receptacles in student toilets.
8. Boys and girls toilet rooms – Provide a junction box and a dedicated 20 amp single phase
power circuit for each future hand dryer. Coordinate the number of hand dryers and
location with the project Architect.
9. Tech Lab (for middle school only) - Provide receptacles and power requirements for
equipment as per manufacturer’s requirements. Provide 2-3 additional receptacles. The
circuit breakers for the Tech Lab should be shunted at the panelboard. The receptacles
and light fixture covers and spray booth at Tech Lab shall conform with NEC Article 500.
10. Applied Tech Center/Engineering Research and Design Center ( high school only) –
Provide receptacles and power requirement for equipment as per manufacturer’s
requirements. Provide 2-3 additional receptacles. The receptacles and light fixture covers
and spray booth at Tech Lab shall conform with NEC Article 500. Circuit breakers for
electric stoves shall be shunted at the panelboard. See Standard Details E-21.0 and E22.0 on following pages.
11. For Home Economics/Nutrition Labs/Food Science Lab (high and middle schools only):
Provide receptacles and power requirements for equipment as per manufacturer’s
requirements. Provide 2-3 additional receptacles. Provide shunt-trip for all electrical
stoves. See Standard Detail E-23.0 on following pages
12. Media Center
a.
For shelving located on the perimeter wall, provide duplex receptacles at 12'intervals
along the toe space of shelving.
b.
For circulation desk if it is located in the center of media center provide a stub-up for
electrical and network wiring, to serve the receptacle and network outlets. Provide
one (1) quad receptacle for each section of circulation desk. Provide one (1) network
outlet for circulation desk. Location for all outlets in the circulation desk shall be
coordinated with architectural detail drawings.
c.
For resource room, provide one (1) duplex receptacle and one (1) data outlet for CD
ROM. Provide one (1) flush floor-mounted duplex receptacle for projector at an
appropriate location as directed by MCPS for viewing the screen. Provide one (1)
duplex receptacle and one (1) data outlet for each computer station. Note: If floormounted receptacles are to be used, the floor box shall be flush mounted.
Revised: 4/17/09
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THIS IS A DESIGN GUIDE NOT A SPECIFICATION
d.
In material preparation area, provide one 6'
-8'length of Wiremold mounted 6” above
counter with receptacles spaced every 18”.
e.
Provide a minimum of two (2) duplex receptacles in media specialist'
s office.
f.
For media workroom, provide one (1) 30a, 208v, 1 phase, NEMA 6-20R receptacle
for copier. Also provide at least one (1) duplex receptacle on each wall of workroom.
g.
In media storage provide one (1) duplex receptacle on each wall. Receptacle
locations should be coordinated with shelving layout.
h.
For high/middle school directional instructional area/tech information access center,
provide one combination data/duplex receptacle for each computer station.
i.
Provide one 120v, 20 amp 1 phase dedicated circuit junction box for security system
for gate (only for high/middle school).
13. Computer Laboratory - For wall mounted computer work- stations, provide wiremold 4000
with divider (upper part to be used for power and lower for network) mounted on wall
flush above built-in wall units. See Standard Detail E-7.0 in Section 16131.
a.
A maximum three (3) duplex receptacles are to be connected to each circuit.
14. MDF Room - Provide five (5) quadruplex receptacles with each connected to a dedicated
emergency circuit.
15. IDF Room - Provide two (2) quadruplex receptacles with each connected to a dedicated
emergency circuit.
16. Communications Laboratory/Support Rooms - A typical communications lab consists of
three (3) areas- studio/support room, control room/support room, and headend
equipment room.
a.
For elementary school studio, provide at least four (4) duplex receptacles on each
side wall. Provide a separate, dedicated circuit for each receptacle.
b.
For high/middle school studio - Provide at least two (2) duplex receptacles on each
side wall. For production lights (provided by MCPS) provide 3 to 5 grid bars. The grid
bars must be furnished and installed by electrical contractor. Above the lighting grid
bars provide ceiling mounted recessed duplex receptacles spaced 5'
x5'matrix.
Provide dedicated circuit for each ceiling mounted receptacle. Coordinate exact
layout with MCPS,
c.
In control room, provide at least two (2) duplex receptacles above countertop.
Provide two (2) duplex receptacles on the back wall and one (1) quad receptacle on
the sidewall of control room.
d.
In head-end equipment room provide two (2) duplex receptacles.
17. Science Labs/Chemistry Labs - provide two (2) duplex receptacles, mounted one (1)
each side of island below the countertop. Provide one (1) duplex receptacles for each
island 6" above countertop for computer. Provide a push button gas valve shut-off at an
exit door for the room. Provide a key operated reset at the teacher’s desk. See Standard
Details E-25.0 and E-26.0 on following pages
a.
Biology/Physics or other Generic Labs - Provide one (1) duplex receptacles
receptacle for each station. Also, provide one (1) duplex receptacles and one (1)
network outlet for each computer. Provide a push button gas valve shut-off at an exit
door for the room. Provide a key operated reset at the teacher’s desk. See Standard
Detail E-24.0 on following pages
18. Business Education Suite (High School only) - Business education suite is combination of
three areas - model office, computing/word processing room, office/storage.
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THIS IS A DESIGN GUIDE NOT A SPECIFICATION
a.
Model Office - Model office has capacity of 32 student work stations, and divided in
eight (8) modules. For each module provide four (4) duplex receptacles and one (1)
data outlet for computers. For instructor’s counter provide two (2) duplex receptacles
and one (1) data outlet. In addition provide one (1) duplex receptacle every 12'on the
parameter of wall. Provide one 30 amp, 1ø, 208 volt NEMA 6-20R outlet for copier.
19. Computing/Work Processing Room - This room has capacity of 32 student stations for
word processing. Provide one (1) duplex receptacle for each station. Provide one (1) data
outlet to serve four (4) stations. In addition provide one (1) duplex receptacle every 12'on
each side wall.
20. Office/Storage - Provide one (1) duplex receptacle and data outlet for each desk location.
21. Cooperative Work Experience (CWE) Classroom (High School only) - On the student
work station area provide five (5) duplex receptacles, each 3'on center and two data
outlets (6'apart) with 1-1/4" empty conduit to ceiling space. In addition provide two
duplex receptacles on other perimeter wall. In the office provide on duplex receptacle one
(1) duplex receptacle and data outlet near teacher’s desk.
22. Career Child Development (High school only) - Career child development area is a
combination of child development laboratory, seminar/personal, family observation and
office/storage area.
a.
The Child Development - Provide two (2) duplex receptacles on each side wall. In
addition provide three (3) duplex receptacles and one (1) data outlet on designated
wall for computer stations. On the kitchen area provide receptacles with dedicated
circuits for microwave oven, refrigerator, and junction boxes w/dedicated circuit for
disposal and dishwasher. Also in kitchen area provide two (2) duplex receptacle
above counter. All electrical outlets in this area shall be GFCI type duplex
receptacles.
23. Seminar/Personal family observation area - Provide two (2) duplex receptacles on each
side wall. Provide five (5) duplex receptacles and two (2) data outlets on designated wall
for computer stations.
a.
Office - Provide one (1) duplex receptacle and one data outlet for each desk location.
24. Baseball field/tennis courts (high school only) - Provide one (1) duplex receptacle (GFC)I
weatherproof type) for pitching machine for baseball field and tennis court. For tennis
courts provide (1) duplex receptacle (twist-lock type) for every two courts.
25. Building Exterior - provide one (1) duplex receptacle (twist-type) on each side of building.
Provide GFCI weatherproof type.
26. Staff lounge - provide four (4) GFCI duplex receptacles with each having a dedicated
circuit for vending machine, microwave oven, etc. Coordinate location with architectural
drawings.
27. Miscellaneous Areas
a.
In mechanical and electrical rooms, provide one (1) duplex receptacle every 20'
along interior of walls.
b.
In general storage rooms, provide at least one (1) duplex receptacle.
c.
On the roof provide one (1) duplex GFCI weatherproof type receptacle within 25 feet
of each air-handling unit per National Electrical Code requirements.
d.
Provide one (1) duplex receptacle for each electric water cooler.
Revised: 4/17/09
WIRING DEVICES
16140 - 5
Date: 01/29/09
TYPICAL TEACHING STATION & FRONT
WALL DETAIL FOR TECHNOLOGY
Revised: 03/27/09
MONTGOMERY COUNTY PUBLIC SCHOOL
STANDARD DETAIL E9.0
PROVIDE 1-11/4"
CONDUIT FROM
CEILING SPACE
DOWN TO 11B BOX
WITH PULL STRING.
5'
16'
4'
12" TACK STRIP Above @
ELEMENTARY SCHOOLS ONLY
TACK
BOARD
MARKER
BOARD
PROVIDE 11B BOX WITH
DOUBLE GANG RING
EXTENSION FOR DATA/
VOICE/TV CONNECTIONS.
16"
3"
MINIMUM OF 32" FROM
CORNER OR CABINET TO
TACKBOARD FOR BACK
TO BACK TEACHING
WALLS AND IF NOT BACK
TO BACK, 16" WILL BE
REQUIRED.
PLEASE TAKE NOTE THAT THE DATA & ELECTRICAL
BOXES IN THIS ILLUSTRATION THAT ARE AT 16" AT
THE BOTTOM OF THE OF THE BOX WILL BE SET AT
16" TO THE TOP OF THE BOX IN PRE-KINDERGARTEN
& KINDERGARTEN CLASSROOMS.
12" TACK STRIP Above @
ELEMENTARY SCHOOLS ONLY
PROMETHEAN BOARD
N.I.C.
Provided by others
Tack Board to be
4' wide
Wall space
permitting.
QUAD ELECTRIC
DESIGNATED FOR
EMERGENCY POWER
(RED)
4'
4'6"
MARKER
BOARD
18"
16"
DUPLEX ELECTRIC
DESIGNATED FOR
PROMETHEAN
BOARD (Grey)
PROMETHEAN BOARD TO BE INSTALLED
IN FRONT OF MARKER BOARD. AT NO TIME
WILL MOUNTING BRAKETS BE ALLWED TO
BE ATTACHED TO MARKER BOARD, THEY
MUST ATTACH ABOVE AND BELOW
MARKER BOARD.
TACK
BOARD
Tack Board to be
4' wide
Wall space
permitting.
11/4” CONDUIT WITH
PULL WIRE TO CEILING.
¾” CONDUIT
PROVIDE 11B BOX WITH
DOUBLE GANG RING
EXTENSION. FACEPLATE WITH
INSERTS PROVIDED BY
OTHERS.
QUAD ELECTRIC DESIGNATED FOR
EMERGENCY POWER (RED) METAL
IVORY PLAT PROVIDED BY ELECTRICAL
CONTRACTOR.
16"
THIS ELEVATION IS FOR
PRE-KINDERGARTEN &
KINDERGARTEN
CLASSROOMS.
16"
THIS ELEVATION IS FOR ALL
CLASSROOMS ABOVE
KINDERGARTEN CLASSROOMS.
3"
16"
Data
Data
Data
Data
TV
Voice
PLEASE TAKE NOTE THAT THE
BOXES IN THIS ILLUSTRATION THAT
ARE SET AT 16" TO THE BOTTOM OF
THE BOX WILL BE SET AT 16" TO THE
TOP OF THE BOX IN PREKINDERGARTEN & KINDERGARTEN
CLASSROOMS.
TEACHER’S STATION TV/DATA/VOICE/ELECTRICAL DETAIL
MONTGOMERY COUNTY PUBLIC SCHOOL
STANDARD DETAIL E10.0
Date: 10/22/08
Revised: 03/27/09