U. S. DEPARTMENT OF COMMERCE
MISCELLANEOUS PUBLICATION M176
CHART IA
Issued August 7, 1944
Price 25 cents (5 charts)
JESSE H. JONES, Secretary
NATIONAL BUREAU OF STANDARDS
LYMAN J. BRIGGS, Director
CONDUCTOR
LOADING
NOMOGRAPH
VERTICAL, TRANSVERSE AND CONDUCTOR LOADS - LB
PER LINEAR FT OF CONDUCTOR
4.0
2.0-
3.0
z
0
C7
z
-J
0
D
5.0
w
0
-J
z
C7
w
0
0
LL.
U
0:
0
z
0
a.
0
0
3.0
Z
al:
1.5
-
w
a-
W
U
C3
z
00
0
4.0
U)
a.
(1z
0
0
0
-J
0
0
0
M
z
0
0
0
z
0
z
0
0
.J
0
0
0
I-
0
z
3.0
W
UI)
a:
w
-
2.0
1.0
UEL
2.0.
1.0
1.0
0.5-_
1.0
0-.
0
CONNECT V AND W WITH STRAIGHT EDGE AND READ
T
Chart 1A.-Conductor loading nomograph, vertical, transverse, and conductor loads-pounds per linear foot of conductor
(Enlarged from fig. 16 of Discussion Handbook H39, NESC, part 2)
Note.-This device provides a sufficiently precise graphic method of determining "conductor loading" values, except for certain conductors
when used in the light-loading district. However, in determining permissible sags and tensions in such a district, the variations found between
the values obtained by this chart and values computed in accordance with rule 251, part 2, NESC (H32) are of little importance, since one of the
unloaded tension limits of rule 261,F,4 will control, except for unusually long spans.
For sale by Superintendent of D;,uments, Washington 25, D. C.
Price 25 cents
metad c100687
U. S. DEPARTMENT OF COMMERCE
JESSE
H,
MISCELLANEOUS PUBLICATION M176
CHART 1B
JONES, Secretary
NATIONAL BUREAU OF STANDARDS
LYMAN J. BRIGGS, Director
CONDUCTOR
VERTICAL
,
TRANSVERSE
LOADING NOMOGRAPH
AND CONDUCTOR LOADS - LB PER LINEAR FT
OF CONDUCTOR
1.0
0.5
00.75
1.4-
z
0
1.3
w
0.9
0
z
0
z
3
0
-J
w
Z
I0
0'
1.2-
I-
F
C7
0
w
a.
z)
0
0.8
00
w
a-
0.6
0.4.
a
1.1I
---
z
0
z
w
0
CL
0
D)
z
0.7
0
-J
0
0
0
I-
0
0
z
z
0.9.
0
0
0
-J
t-
0.6 _L.
0.5
z
0
0
0
-
-J
I.0
0
0
z
F-
0.3..
w
o.8-
Ul)
w
0.4
U)
z
0.5 4.
t-
0.7
0.6
0.4
0.2...
0.3
0.4~
. 0.3
0.2
0.23
0.I-
0.1
0.1I
0.1-4
0.01.
.0-
.01
CONNECT V AND W WITH STRAIGHT EDGE AND READ T
[See note on opposite side.]
U.
S. GOVERNMENT
PRINTIhG OFFICE
16-40993-1
metadcl00688
U. S. DEPARTMENT OF COMMERCE
MISCELLANEOUS PUBLICATION M176
CHART 2A
JESSE H. JONES, Secretary
NATIONAL BUREAU OF STANDARDS
LYMAN J. BRIGGS, Director
BENDING MOMENT
DUE TO WIND PRESSURE ON POLE
K
160-150-
20000-i
140
15000-
H
M2
M.
-90
-50 000
-40 000
80
-30 000
130-
70
10000
120-
8000
11O-
-20 000
-60
6000
5000
100-
4 000
90
-10000
~50
8000
3000
6 000
-40
80
2000
4000
1 500
3 000
70-
-30
1 000
2000
800
60
600
500
I 000
400
50
800
20
300
600
500
200
40
K
-
=
2T+G
WHERE
AND
-
16
T =CIRCUMFERENCE AT POLE TOP, IN INCHES
G = CIRCUMFERENCE AT GROUND LINE, IN INCHES.
HEIGHT OF POLE ABOVE GROUND
LINE , IN FEET.
MOMENT AT GROUND LINE FOR HEAVY AND MEDIUM
M2=
400
LOADING , IN POUND-FEET.
MOMENT AT GROUND LINE FOR LIGHT LOADING, IN POUND -FEET.
LAY STRAIGHTEDGE
ACROSS CHART FROM K TO H AND READ
BENDING MOMENT AT M, OR M2
Chart 2A.-Bending moment due to wind pressure on pole
(Enlarged from fig. 19 of Discussion Handbook H39, NESC, part 2)
16-40993--1
metadcl00689
MISCELLANEOUS PUBLICATION M176
CHART 2B
U. S. DEPARTMENT OF COMMERCE
JESSE H. JONES, Secretary
NATIONAL BUREAU OF STANDARDS
LYMAN J. BRIGGS, Director
ULTIMATE
MOMENTS
RESISTING
OF
POLES
WOOD
700
700
,
I
t
t
1
500
500
I
-
_ - _ t I : 1 _- -i -Y-t-
_-
-_j II- __
I
CO
f
I
300C
3 0 0
200 z
z 200
Co
0
0
I
I
200
100
!-t '--- -!1-? -j- _-- -- ,T- - -- - - - - {--_ - - - -- --I-- -- - -~--~ - ~ - !- I
-}
-
-
-
aI
-niIIIi,
-
-
--
z
I-
70
Z
------
f
- - --l
4
-0- -
-
50
%
-1-----
-
--.-
C"")
70
AND DOUGL AS FIR
2. LODGEPOLE PINE.
n
w
50
I. CREOSOTED SOUTHERN PINE
a
-
0
20
100
30
4. WESTERN
w
RED CEDAR
6. NORTHERN WHIECEA
2J
AND REDWOOD
I0
18
22
26
34
30
POLE
38
42
CIRCUMFERENCES
46
AT GROUND
50
54
LINE -
58
62
66
70
INCHES
Chart 2B.-Ultimate resisting moments of wood poles
(Enlarged from fig. 20 of Discussion Handbook H39, NESC, part 2)
10-40993-1
U. S.
GOVERNMENT
PRINTING
OFFICE
metadcl00690
+U. S. DEPARTMENT OF COMMERCE
MISCELLANEOUS PUBLICATION
CHART 3
JESSE H. JONES, Secretary
M176
NATIONAL BUREAU OF STANDARDS
LYMAN J. BRIGGS, Director
CATENARY
'i i
r.i
-i..
-i i
_ ._.
_ ..
i~ivI
:.-_.
40
30
60
50
70
90
80
" IIL11I LiJ -1 1T PW II t H-L1ffI LIIWN iliI
._Vt'
:l--l
CATENARY
CURVE
ORDINATES
717
1
1""'!'
rT"7
!'
"P
Y"
T
i
7
I
T
l-I
1
-
-f
!
!
I
I
Y--+x"131
I
II
T
-
+!-I
Y
_'-
_ ____.
_
i
'
-
-r-r- 1
-r
I
20
30
L4-Git-l
SAG
IS
LESS
THAN
THE
SPAN
LENGTH.
-I-~11
14
-f
t
I
I
-
i
i
I0
1
i
L tif
20
I; I;
30
41: TL
- _--- - ----
t
Al
-hi
ti,
i~KHP
14
1
10 % OF
v
I-I
711:THE
AT
CURVE GIVES APPROXIMATE VALUES OF SAG
ALL POINTS ON THE CATENARY CURVE EXPRESSED
IN PER CENT OF THE CENTER SAG.
THE ERROR IS
NEGLIGIBLE FOR ALL SPANS IN WHICH
THE CENTER
1
I]
I_
10
IOG
...,
v
-.
-
VT-,
'
20
I0
?'""
r
!
0
CURVE
_.-
- -_-
4..T.
4:T...
40
--- _
tF1I1
ho
40
Z
u
T
-
-
F-
5s0
50
I6
0
I-
Z
LI'~-- I3
S0.
~ ~~~~-
70
i--
i- -
-
- ---- ttiiiKj
'it-T
~T
-
-
ij
-ii
60
70
-
----
80
80
44
V:+f47's;
i-It It--
>41 VK
~~i~
0
I0
20
~~
-
-
I'i
- t------"1
90
-
90
~4;lI4L+l4~~
30
40
PER
CENT
50
60
OF SPAN
LENGTH
70
80
90
1n
100
Chart 3.-Catenary curve
(Enlarged from fig. 18 of Discussion Handbook H39, NESC, part 2)
U. S.
GOVERNMENT
P1NTING
OFFICE
16-40963-1
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3
LJ-I,"