New Zealand Gazette – 1927 – No. 48

Page 2419

✨ Electrical Wiring Regulations

July 12.] THE NEW ZEALAND GAZETTE. 2419

TABLE IV.—VULCANIZED-RUBBER CABLES : CURRENT-CARRYING CAPACITY
(SUBJECT TO VOLTAGE-DROP) AND CORRESPONDING FALL IN PRESSURE.

Nominal Area of Conductor.	Number and Diameter (In.) of Wires comprising Conductor.	Single Cables run in Pairs.	Concentric or Twin Cable.	Three-core Cable.	Approximate Total Length in Circuit (Lead and Return) for 1-volt Drop with Maximum Permissible Current (Col. 3).
1.	2.	3.	4.	5.	6.
Sq. in.		Amps.	Amps.	Amps.	Ft.
0·001	1/·036	4·1	3·5	—	30
0·0015	1/·044	6·1	5·2	—	30
0·002	3/·029	7·8	6·7	—	30
0·003	3/·036	12·0	10·3	—	29
0·003	1/·064	12·9	11·1	—	29
0·0045	7/·029	18·2	15·7	13·6	28
0·007	7/·036	24·0	20·6	18·0	33
0·01	7/·044	31·0	26·6	23·2	39
0·0145	7/·052	37·0	32·0	27·8	45
0·0225	7/·064	46·0	39·0	34·0	55
0·03	19/·044	53·0	46·0	40·0	61
0·04	19/·052	64·0	55·0	47·0	71
0·06	19/·064	83·0	71·0	59·0	83
0·075	19/·072	97·0	83·0	69·0	90
0·1	19/·083	118·0	100·0	83·0	98
0·12	37/·064	130·0	118·0	90·0	103
0·15	37/·072	152·0	126·0	105·0	112
0·2	37/·083	184·0	149·0	126·0	123
0·25	37/·093	214·0	170·0	146·0	132
0·3	37/·103	240·0	188·0	—	145
0·4	61/·093	288·0	220·0	—	162
0·5	61/·103	332·0	249·0	—	172
0·6	91/·093	384·0	—	—	181
0·75	91/·103	461·0	—	—	185
0·85	127/·093	512·0	—	—	190
1·0	127/·103	595·0	—	—	200

The figures given in Table IV apply to single cables run in pairs in iron conduits or in wood casing, and to single cables sheathed with tough rubber compound, and to concentric, twin, and three-core cables of any finish, run singly.

The maximum permissible currents (subject to voltage-drop) for the various sizes of conductors up to 1 square inch in cross-sectional area are shown in columns 3, 4, and 5 of the table, which allow for a rise in temperature of 20 degrees F. for rubber-insulated cables. For sizes below 0·007 square inch the table is based on a current density of 4,000 amperes per square inch.

The table refers to situations where the temperature of the air does not exceed 80° F. and thus the normal maximum running temperature is 100° F. Rubber-insulated cables should not be allowed to attain a temperature higher than 120° F. for long periods, or for a short period 130° F. The figures, therefore, in the latter case allow of a margin of 30 degrees F.

Where the temperature of the air exceeds 80° F. the permissible current should be reduced so that the maximum temperature of the rubber-insulated cables does not exceed the figures given above.

The further limitation of the size of conductor by the permissible drop in voltage is dealt with in Regulation 80 (a).

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VUW Te Waharoa — NZ Gazette 1927, No 48

NZLII — NZ Gazette 1927, No 48

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✨ LLM interpretation of page content

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

Domain🏗️ Infrastructure & Public Works
Dated11 July 1927
KeywordsRegulations, Electrical Wiring, Safety, Compliance, Conductors, Cables, Current-carrying Capacity, Insulation Resistance, Tables

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