New Zealand Gazette – 1927 – No. 48

Page 2395

✨ Electrical Supply Regulations Tables



JULY 12.] THE NEW ZEALAND GAZETTE. 2395

TABLE X.—BARE COPPER-COVERED STEEL.

Wind, 18lb. per square foot of diametral plane.

Constants.--Coefficient of thermal expansion = 7·2 × 10⁻⁶ per degree Fahrenheit ; modulus of elasticity = 20 × 10⁷ lb. per square inch.

NOTE.--This table is for use with wires having a breaking-strength not less than that stated for each size of wire.

(A.) 1/·128 in. (10 S.W.G.).

Constants. — Area, 0·0129 sq. in.; breaking-strength, 1200 lb.; diameter, 0·128 in.; loading factor, 4·315; maximum tension in conductor, 480 lb.; weight, 0·046 lb. per foot.

Span. Datum. Degrees Fahrenheit above Datum.
20. 40. 60. 80.
Ten. Sag. Ten. Sag. Ten. Sag. Ten. Sag.
Ft. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in.
180 424 0 5½ 388 0 5⅜ 352 0 6½ 316 0 7
220 397 0 8½ 362 0 9¼ 326 0 10 292 0 11½
260 366 1 1 332 1 2 298 1 4 265 1 6
300 332 1 7 299 1 9 268 1 11 238 2 2
340 296 2 3 266 2 6 238 2 10 212 3 2
380 261 3 2 235 3 7 212 3 11 192 4 4
100.
Ten. Sag.
lb. Ft. in.
280 0 8 246 0 9
258 1 1 226 1 3
234 1 8 205 1 11
210 2 6 186 2 9
190 3 6 170 3 11
174 4 9 159 5 3

(B.) 1/·162 in.

Constants.--Area, 0·02062 sq. in.; breaking-strength, 1800 lb.; diameter, 0·162 in.; loading factor, 3·475; maximum tension in conductor, 720 lb.; weight, 0·073 lb. per foot.

Span. Datum. Degrees Fahrenheit above Datum.
20. 40. 60. 80.
Ten. Sag. Ten. Sag. Ten. Sag. Ten. Sag.
Ft. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in.
180 658 0 5½ 600 0 6 543 0 6½ 485 0 7½
220 629 0 8½ 572 0 9½ 516 0 10½ 460 0 11½
260 594 1 0 538 1 2 484 1 3 432 1 5
300 556 1 6 502 1 8 450 1 10 402 2 1
340 514 2 1 464 2 3 417 2 6 373 2 10
380 472 2 9 426 3 1 384 3 5 344 3 10
100.
Ten. Sag.
lb. Ft. in.
430 0 8½ 376 0 9½
406 1 1 355 1 3
381 1 7 334 1 10
356 2 4 315 2 7
332 3 2 297 3 7
312 4 3 282 4 8

(C.) 1/·204 in.

Constants.--Area, 0·03278 sq. in.; breaking-strength, 2650 lb.; diameter, 0·204 in.; loading factor, 2·821; maximum tension in conductor, 1060 lb.; weight, 0·116 lb. per foot.

Span. Datum. Degrees Fahrenheit above Datum.
20. 40. 60. 80.
Ten. Sag. Ten. Sag. Ten. Sag. Ten. Sag.
Ft. lb. Ft. in. lb. Ft. in. lb. Ft. in. lb. Ft. in.
180 987 0 5½ 896 0 6¼ 806 0 7 715 0 8
220 953 0 9 863 0 10 776 0 11 689 1 0
260 914 1 1 827 1 2 740 1 4 657 1 6
300 869 1 6 785 1 8 704 1 10 627 2 1
340 823 2 0 744 2 3 668 2 6 596 2 10
380 773 2 9 698 3 0 630 3 4 566 3 8
100.
Ten. Sag.
lb. Ft. in.
629 0 9 544 0 10½
605 1 2 526 1 4
580 1 8 509 1 11
556 2 4 492 2 8
532 3 2 476 3 6
510 4 1 461 4 6


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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