New Zealand Gazette – 1927 – No. 48

Page 2379

✨ Electrical Supply Regulations Tables



JULY 12.] THE NEW ZEALAND GAZETTE. 2379

(H.) 19/·083 in.

Constants.—Area (copper), 0·1028 sq. in. ; diameter (covered), 0·698 in. ; loading factor, 1·65 ; maximum tension in conductor, 2570 lb. ; weight of covered conductor, 0·5276 lb. per foot.

Span. Datum. Degrees Fahrenheit above Datum.
0. 20.
Ten. Sag.
Ft. lb. Ft. in.
120 .. 2493 0 4½
140 .. 2466 0 6¼
160 .. 2436 0 8½
180 .. 2403 0 11
40. 60. 80. 100.
Ten. Sag. Ten. Sag.
lb. Ft. in. lb. Ft. in.
1836 0 6¼ 1528 0 7½
1825 0 8½ 1529 0 10
1811 0 11 1529 1 1
1800 1 2 1530 1 5

TABLE III.—V.I.R. (H.D.) COPPER.

Wind, 12 lb. per square foot of diametral plane.

Constants.—Coefficient of thermal expansion = 9·45 × 10−⁶ per degree Fahrenheit ; maximum allowable stress = 25,000 lb. per square inch ; modulus of elasticity = 18 × 10⁶ lb. per square inch.

NOTE.—In computing the loading factor for this table the weight and diameter of the covered wire only has been used.

(A.) 7/·036 in. (7/20 S.W.G.).

Constants.—Area (copper), 0·00712 sq. in. ; diameter (covered), 0·259 in. ; loading factor, 4·94 ; maximum tension in conductor, 178 lb. ; weight of covered conductor, 0·0536 lb. per foot.

Span. Datum. Degrees Fahrenheit above Datum.
0. 20.
Ten. Sag.
Ft. lb. Ft. in.
120 .. 63 1 6
140 .. 53 2 6
160 .. 48 3 7
180 .. 45 4 10
40. 60. 80. 100.
Ten. Sag. Ten. Sag.
lb. Ft. in. lb. Ft. in.
50 1 11 45 2 2
45 2 11 42 3 1
43 4 0 41 4 2
41 5 4 40 5 6

(B.) 7/·044 in.

Constants.—Area (copper), 0·01064 sq. in. ; diameter (covered), 0·287 in. ; loading factor, 4·13 ; maximum tension in conductor, 266 lb. ; weight of covered conductor, 0·0717 lb. per foot.

Span. Datum. Degrees Fahrenheit above Datum.
0. 20.
Ten. Sag.
Ft. lb. Ft. in.
120 .. 150 0 10
140 .. 125 1 5
160 .. 106 2 2
180 .. 95 3 1
40. 60. 80. 100.
Ten. Sag. Ten. Sag.
lb. Ft. in. lb. Ft. in.
105 1 3 90 1 5
93 1 11 83 2 2
85 2 8 78 2 11
80 3 7 75 3 11

(C.) 7/·052 in.

Constants.—Area (copper), 0·01483 sq. in. ; diameter (covered), 0·317 in. ; loading factor, 3·51 ; maximum tension in conductor, 371 lb. ; weight of covered conductor, 0·0945 lb. per foot.

Span. Datum. Degrees Fahrenheit above Datum.
0. 20.
Ten. Sag.
Ft. lb. Ft. in.
120 .. 264 0 7¾
140 .. 233 0 11
160 .. 204 1 6
180 .. 181 2 1
40. 60. 80. 100.
Ten. Sag. Ten. Sag.
lb. Ft. in. lb. Ft. in.
183 0 11 152 1 1
166 1 5 141 1 8
152 2 0 133 2 3
141 2 8 128 3 0


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🏗️ Electrical Supply Regulations, 1927 (continued) (continued from previous page)

🏗️ Infrastructure & Public Works
Regulations, Electrical Supply, Public Works Act, Inspections, Fees, Compliance, Dangerous Lines, Penalties, Tables, Constants, Span, Tension, Sag