New Zealand Gazette – 1927 – No. 48

Page 2422

✨ Electrical Regulations Tables

2422

THE NEW ZEALAND GAZETTE.

[No. 48

TABLE IX.—INSULATION RESISTANCE OF CABLES.

Conductor.	Minimum Insulation Resistance, Megohms for a Mile Length at 60° F.
Nominal Area of Cable.	Number and Diameter (In.) of Wires.
1.	2.
Sq. in.
0·001	1/·036
0·0015	1/·044
0·002	3/·029
0·003	3/·036
0·003	1/·064
0·0045	7/·029
0·007	7/·036
0·01	7/·044
0·0145	7/·052
0·0225	7/·064
0·03	19/·044
0·04	19/·052
0·06	19/·064
0·075	19/·072
0·1	19/·083
0·12	37/·064
0·15	37/·072
0·2	37/·083
0·25	37/·093
0·3	37/·103
0·4	61/·093
0·5	61/·103
0·6	91/·093
0·75	91/·103
0·85	127/·093
1·0	127/·103

For (a) direct-current systems for pressures not varying from earth potential by more than 250 volts; (b) three-phase systems, with centre point earthed, for pressures not more than 500 volts between phases.

† For pressures not varying from earth potential by more than 660 volts.

TABLE X.—TEST PRESSURES FOR FLEXIBLE CORDS.

Kind.	Insulating-material.	Test Pressure and Frequency.	Nature of Test.
1.	2.	3.	4.
High insulation (1) ..	Pure rubber ..	Volts.
Medium insulation (2) ..	Pure rubber ..	1 500 at 25–100 ~	}
Medium insulation (2) ..	Vulcanizing rubber ..	1 000 at 25–100 ~	Between conductors, in
		1 500 at 25–100 ~	dry state.
High insulation (1) ..	P u r e and vulcanizing rubber	1 000 at 25–100 ~	In water, after 24 hours’ immersion.

TABLE XI.—INSULATION RESISTANCE OF FLEXIBLE CORDS HAVING VULCANIZED-RUBBER INSULATION.

Nominal Area of Conductor.	Number and Diameter (In.) of Wires comprising Conductor.	Minimum Insulation Resistance, Megohms for a Mile Length at 60° F.
1.	2.	High Insulation.
Sq. in.		Megohms.
0·0006	14/·0076	1 250
0·001	23/·0076	1 250
0·0017	40/·0076	1 250
0·003	70/·0076	1 250
0·0048	110/·0076	1 250
0·007	162/·0076	900

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VUW Te Waharoa — NZ Gazette 1927, No 48

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🏗️ 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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