821
liEPOH.T OF COMMITTEE
ON L I G H T N I N G
LP-I
PltO'rECTION
Report of Committee on Lightning Protection
W. W. Lewis, Ohairmnn,
1675 Wendell Ave., Schenectady, N. Y. 12308
(rep. The Institute of l'~leetrical & Electronics l'Tngineers)
J. M. Clayton, A'ecretoru,
~,Vestlnghouse I'~lectric Corp., Bldg. 8-L29, East I'ittsburgh, Pa. ISl12
(rep. The Institute of Electrical & Electronics I-~ngineers)
Jaffrey Aronin, American Institute of
Architects.
James H. Baker, United L i g h t n i n g ProleCtion Assn.
I". A. Fisher, National Electrical Man:lfacturers Assn.
C, D. Friday, U. S. Dept. of the Navy.
Mnrvin Frydenlund, L i g h t n i n g Protection
Institute.
I,, J. Hall, Mill Mutual Fire Prevention
Ilureau.
M, D. H a r g e r , H a r g e r L i g h t n i n g Proteetlon Inc.
houls P. Harrison, W e a t h e r ]~nreau, U. S.
I)epartment of Commerce.
~. F. Hedlund, Factory Mutual F.ngineer.
tng Corporation.
R. P. Howell, American Petroleum Instllute.
R. J. Mayewski, lustitute of Makers of
b:xplosi yes.
J. C. Norton, Union Carbide Corp.
Norbert J. Patek, Factory Insurance Assn.
Alvin E. Peterson, National Bureau oi
Standards.
W a l t e r G. Queen, U. S. Dept. of the
Army.
C. M. Rowley, American Mutnal l n s u r .
ance Alliance.
L. H. Sessler, Telephone Group.
A. R. Small, Underwriters' Laboratories,
]nc.
H. R. Stewart, The Institute of Electrical
& Electronics Engineers.
John M. Thompson, L i g h t n i n g Rod Mfrs.
Assn.
Alternates.
O. W. Bodle, The Telephone Group. (AlHoward L. Hutchins, "United Lightning
ternate to L. H. Sessler.)
Protection Assn. (Alternate to James
H. Baker.)
J, M. Clayton, National Electrical Manufacturers Assn. (Alternate to F. A.
J. F. McKenna, American I~etroleum InFisher.)
stitute. (Alternate to R. P. Howell.)
IL E. Cripe, L i g h t n i n g Protection InstiJohn Witte, Underwriters' Laboratories,
tute. (Alternate to Marvin Frydenlund.)
Inc. (Alternate to A. R. Small.)
A. Ca. Foreier, F a c t o r y Insurance Assn.
(Alternate to N. J-. P a t e k . )
ScoPE: L i g h t n i n g p r o t e c t i o n of p e r s o n s ; o r d i n a r y b u i l d i n g s ; m i s c e l l a n e o u s
structures; buildings containing baled flammable materials; smokestacks and
chimneys; aircraft and aircraft hangars; sailboats, power boats, small boats
a n d s h i p s ; trees; l i v e s t o c k in fields; picnic g r o u n d s , p l a y g r o u n d s , ,ball p a r k s ,
a n d o t h e r o p e n p l a c e s ; a n d s t r u c t u r e s c o n t a i n i n g f l a m m a b l e liquids a n d gases.
It c o o p e r a t e s w i t h the S e c t i o n a l C o m m i t t e e on G e n e r a l S t o r a g e of F l a m m a b l e
L i q u i d s w i t h respect to oil t a n k s .
This report has been submitted to ballot o] the Committee,
which consists o] 22 members. Only 16 o] 22 ballots were returned to date. Below is a tabulation o] the results:
Item No.
Total
"Yes" Votes
1
2
3
4
5
14
15
16
16
15
Total
"No" Votes
I
1
0
0
1
Total
"Not Voting"
I
0
0
0
0
822
LP-2
REVISIONS TO NFPA NO. 7 8
This Committee, organized under the aegis of the Unitc~
States of America Standards Institute (C5) and sponsorel~
jointly by the NFPA and the Institute of Electrical and Elec,
tronics Engineers, l)resents the following amendments to thr
latest edition of the Lightning Protection Code (NFPA No
78--1965, C5.1--1965) as published in separate pamphlet form
and in Volume 4 of the National Fire Codes, 1967-68.
1968 Proposed Revisions to the
Lightning Protection Code
NFPA
ASA
1.
No. 78 -- 1965
C5.1-
1965
Revise the scope o] the Committee to read:
ScoPE: The protection from lightning of ,buildings and structures of all
sorts, recreation and sports areas, and any other situations involving danger
from lightning to people or property. The protection of electric generating,
transmission and distribution systems ks not within the scope of this committee.
2. Par. 103. ( b ) 1. Revise to read:
1. Large metal-frame buildings.
3. Par. 2181. Add to the present text two new sentences, the revised text o / t h e entire Paragraph to read:
2181. Wires Entering Buildings.--Wires entering buildings shall conform to applicable requirements of the National
Electrical Code. A lightning protection system installed to
provide protection against lightning damage to a building does
not provide protection -against possible lightning surges on
electric service conductors and television or radio antenna
systems. It is recommended that buildings equipped with
standard lightning protection be provided with approved lightning protective devices, where the electric service conductors
and antenna wires enter the building.
4. Par. 2910. Revise to read:
2910. Picnic Grounds and Playgrounds.--Protection from
lightning may be afforded to some extent for picnic grounds
and playgrounds by erecting shelters, with either closed or
open sides. Standard lightning protection should be provided
for such shelters. Down conductors should be shielded with
a nonconductive material, resistant to impact and climatic con-
823
RI*H'ORT O F C O M M I T T E E ON L I G H T N I N G
PFtOTECTION
LP-3
[10~,ns. to a height of at)l)roximately eight feet. Shelters with
~lh~n tloors which are provided with lightning protection
, a r m s should have any a p p r o v e d g r o u n d i n g electrodes internuccted by an encircling buried, bare conductor of a type
nlal~le for such service, or such electrodes should be provided
.vlh radial conductors run out to a distance of at least 10 feet
....m~ the electrode a w a y from the shelter.
Au alternate method of protection would be the" erection of
.*les on opposite sides of the grounds, near the edges. Wires
,;,uld be s t r u n g between these poles at a height of approxi,.lately 20 feet above the ground. D o w n leads would connect
~0w wires with g r o u n d rods. D o w n conductors should be
:,hic[ded with a nonconductive material, resistant to impact
mid climatic conditions, to a height of a p p r o x i m a t e l y eight
IIcet. T h e wires should be at least No. 4 A w g copper, or equiv[~lent. If steel poles or m a s t s are used instead of wood, down
l(!ads are not necessary but the foot of the pole or m a s t should
he grounded. If the area to be protected is extensive, it m a y
~0c desirable to use several poles a r r a n g e d around the perim~-ter so t h a t the area is covered by a n e t w o r k of wires. A sufficient n u m b e r of wires should be used so that the entire field
lalls within the zone of protection. See F i g u r e s B and C in
.Section 31 for illustration.