New Zealand Gazette – 1935 – No. 65

Page 2568

✨ Electrical Standards Tables



2568
THE NEW ZEALAND GAZETTE.
[No. 65

TABLE VI.—RUBBER-INSULATED FLEXIBLE CABLES FOR USE WITH PORTABLE APPLIANCES: CURRENT-CARRYING CAPACITY.
(Standard Annealed Copper.)

Number and Diameter (Inches) of Wires comprising Conductor.* Nominal Area. Maximum Current permissible (subject to Voltage-drop).
1. 2. Two Conductors. Three Conductors.
3. 4.
Sq. in. Amps. Amps.
140/·010 0·01 20 17
195/·010 0·0145 24 20
296/·010 0·0225 30 25
266/·012 0·03 35 30
368/·012 0·04 42 35
  • The current-carrying capacity of a conductor having wires of a number, or diameter, not specified in this table shall be taken to be proportionate to that of the cases specified.

An earthing-lead, whether insulated or not, forming part of a flexible cable is not deemed to be a conductor for the purpose of this table.

TABLE VII.—FLEXIBLE CORDS: DIMENSIONS AND RESISTANCE OF CONDUCTORS.

Ordinary Flexible Cords or Flexible Cords with Tough Rubber Sheathing.* Flexible Cords with Tough Rubber Sheathing.
Number of 0·0076-inch-diameter Wires comprising Conductor. Resistance per 1,000 Yards at 60° F. Number of 0·012-inch-diameter Wires comprising Conductor. Resistance per 1,000 Yards at 60° F.
1. 2. 3. 4. 5. 6. 7.
Ohms. Ohms. Ohms. Ohms. Ohms.
14† 39·7 40·5 41·3 — — —
23 24·2 24·6 25·1 11‡ 24·6 25·1
40 13·9 14·2 14·4 16* 14·2 14·4
70 7·94 8·1 8·26 28* 8·1 8·26
110 5·05 5·15 5·25 44* 5·15 5·25
162 3·43 3·5 3·57 65* 3·5 3·57
  • All copper.
    † 14/·0076 may be used only in accordance with Regulation 43–11 hereof.
    ‡ 9 copper ; 2 steel.

TABLE VIII.—FLEXIBLE CORDS: CURRENT-CARRYING CAPACITY AND THICKNESS OF INSULATION.

Number and Diameter of Wires comprising Conductor.* Minimum Radial Thickness of Insulating Material. Minimum Radial Thickness of Tough Rubber Sheathing for Heavy Duty.
0·0076-inch-diameter Wires.† 0·012-inch-diameter Wires. Nominal Area. Maximum Current permissible (subject to Voltage-drop). High Insulation. Medium Insulation.
Pure Rubber. (a) Pure and/or Vulcanized Rubber; (b) Homogeneous Insulation. Homogeneous Insulation with a Lapping of Cotton or Silk next to the Conductor. Pure Rubber. (a) Pure and/or Vulcanized Rubber; (b) Homogeneous Insulation. Single.
1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
Sq. in. Amps. In. In. In. In. In. In.
14‡ — 0·0006 1·8 0·020 0·033 0·031 0·015 0·028 —
23 11§ 0·0010 3·0 0·020 0·034 0·031 0·015 0·029 0·050
40 16† 0·0017 5·0 0·020 0·035 0·031 0·015 0·030 0·050
70 28† 0·0030 10·0 0·020 0·036 0·036 0·015 0·031 0·050
110 44† 0·0048 15·0 0·020 0·038 0·038 0·015 0·032 0·050
162 65† 0·0070 20·0 0·020 0·039 0·039 — — 0·050
  • The current-carrying capacity of a conductor having wires of a number or diameter not specified in this table shall be taken to be proportionate to that of the cases specified.
    † All copper.
    ‡ 14/·0076 in. may be used only in accordance with Regulation 43–11 hereof.
    § 9 copper ; 2 steel.
    || A thickness of 0·030 in. is permissible for pendants up to 250 volts in the case of twin flexible cords having conductors of 23/·0076 in. or 11/·012 in.


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🏗️ Rubber-Insulated Flexible Cables: Current-Carrying Capacity (continued from previous page)

🏗️ Infrastructure & Public Works
Rubber-Insulated Cables, Flexible Cables, Current-Carrying Capacity, Electrical Standards

🏗️ Flexible Cords: Dimensions and Resistance of Conductors

🏗️ Infrastructure & Public Works
Flexible Cords, Dimensions, Resistance, Electrical Standards

🏗️ Flexible Cords: Current-Carrying Capacity and Thickness of Insulation

🏗️ Infrastructure & Public Works
Flexible Cords, Current-Carrying Capacity, Insulation Thickness, Electrical Standards