New Zealand Gazette – 1927 – No. 48

Page 2377

✨ Electrical Supply Regulations Tables



JULY 12.] THE NEW ZEALAND GAZETTE. 2377

(E.) 19/.052 in.
Constants.—Area, 0.0403 sq. in.; diameter, 0.260 in.; loading factor, 1.923; maximum tension in conductor, 1008 lb.; weight, 0.1582 lb. per foot.

Span. Datum. 0. Ten. Datum. 0. Sag. 20. Ten. 20. Sag. 40. Ten. 40. Sag. 60. Ten. 60. Sag. 80. Ten. 80. Sag. 100. Ten. 100. Sag.
Ft. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in.
120 .. 979 0 3 1/2 846 0 4 716 0 4 1/2 589 0 5 1/4 469 0 7 1/2 364 0 9 1/2
140 .. 970 0 4 3/4 838 0 5 1/2 709 0 6 1/2 586 0 8 472 0 10 374 1 0
160 .. 958 0 6 1/4 828 0 7 1/2 702 0 8 3/4 583 0 10 1/2 475 1 1 383 1 4
180 .. 946 0 8 817 0 9 1/2 696 0 11 580 1 1 478 1 4 392 1 8

TABLE II.—TRIPLE BRAIDED (H.D.) COPPER.
Wind, 12 lb. per square foot of diametral plane.
Constants.—Coefficient of thermal expansion = 9.45 x 10⁻⁶ per degree Fahrenheit; minimum allowable stress = 25,000 lb. per square inch; modulus of elasticity = 18 x 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/.038 in. (7/20 S.W.G.).
Constants.—Area (copper), 0.00712 sq. in.; diameter (covered), 0.259 in.; loading factor, 5.16; maximum tension in conductor, 178 lb.; weight of covered conductor, 0.0513 lb. per foot.

Span. Datum. 0. Ten. Datum. 0. Sag. 20. Ten. 20. Sag. 40. Ten. 40. Sag. 60. Ten. 60. Sag. 80. Ten. 80. Sag. 100. Ten. 100. Sag.
Ft. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in.
120 .. 61 1 6 54 1 9 48 1 11 43 2 2 40 2 4 37 2 6
140 .. 51 2 6 47 2 8 43 2 11 41 3 1 38 3 4 36 3 6
160 .. 46 3 7 43 3 9 41 4 0 39 4 3 37 4 5 36 4 7
180 .. 43 4 10 41 5 1 40 5 3 38 5 6 37 5 8 35 5 10

(B.) 7/.044 in.
Constants.—Area (copper), 0.01064 sq. in.; diameter (covered), 0.280 in.; loading factor, 4.19; maximum tension in conductor, 266 lb.; weight of covered conductor, 0.0687 lb. per foot.

Span. Datum. 0. Ten. Datum. 0. Sag. 20. Ten. 20. Sag. 40. Ten. 40. Sag. 60. Ten. 60. Sag. 80. Ten. 80. Sag. 100. Ten. 100. Sag.
Ft. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in.
120 .. 154 0 9 1/2 128 0 11 1/2 106 1 2 90 1 5 77 1 7 68 1 10
140 .. 127 1 4 108 1 7 94 1 10 82 2 1 73 2 4 67 2 6
160 .. 108 2 0 96 2 4 85 2 7 77 2 10 71 3 1 66 3 4
180 .. 96 2 11 87 3 2 80 3 6 74 3 9 70 4 0 65 4 3

(C.) 7/.052 in.
Constants.—Area (copper), 0.01483 sq. in.; diameter (covered), 0.327 in.; loading factor, 3.58; maximum tension in conductor, 371 lb.; weight of covered conductor, 0.0882 lb. per foot.

Span. Datum. 0. Ten. Datum. 0. Sag. 20. Ten. 20. Sag. 40. Ten. 40. Sag. 60. Ten. 60. Sag. 80. Ten. 80. Sag. 100. Ten. 100. Sag.
Ft. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in.
120 .. 271 0 7 227 0 8 1/2 188 0 10 155 1 0 128 1 3 108 1 6
140 .. 241 0 11 203 1 1 169 1 3 143 1 6 123 1 9 107 2 0
160 .. 213 1 4 181 1 7 155 1 10 135 2 1 119 2 4 107 2 8
180 .. 188 1 11 163 2 2 144 2 6 128 2 9 116 3 1 106 3 4


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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