New Zealand Gazette – 1927 – No. 48

Page 2418

✨ Electrical Wiring Regulations Tables



2418

THE NEW ZEALAND GAZETTE.

[No. 48

TABLE II.--COMPARISON BETWEEN THE OLD STANDARD SIZES OF CON-
DUCTORS AND THE NEW STANDARD SIZES SET OUT IN B.S.S. No. 7.

New Nominal Area | Diameter (In.) of | Number and Gauge or | Old Nominal Area
in Sq. In. | Wires comprising | Diameter (In.) of | in Sq. In.
Conductor. | Wires in Conductor.

  1. | 2. | 3. | 4.
    0·001 | 1/·036 | 1/20 S.W.G. | 0·001
    0·0015 | 1/·044 | 1/18 ,, | 0·0018
    | | 3/22 ,, | 0·0018
    0·002 | 3/·029 | 7/25 ,, | 0·0022
    0·003 | 3/·036 | 3/20 ,, | 0·003
    | | 7/23 ,, | 0·0081
    0·003 | 1/·064 | 1/16 ,, | 0·0082
    | | 7/22 ,, | 0·0042
    0·0045 | 7/·029 | 7/21½ ,, | 0·0049
    0·007 | 7/·036 | 7/20 ,, | 0·007
    | | 7/19 ,, | 0·0086
    0·01 | 7/·044 | 7/18 ,, | 0·0125
    0·0145 | 7/·052 | 7/17 ,, | 0·017
    0·0225 | 7/·064 | 7/16 ,, | 0·022
    0·03 | 19/·044 | 19/18 ,, | 0·034
    | | 7/14 ,, | 0·035
    0·04 | 19/·052 | 19/17 ,, | 0·046
    0·06 | 19/·064 | 19/16 ,, | 0·06
    0·075 | 19/·072 | 19/15 ,, | 0·075
    | | 19/14 ,, | 0·094
    0·1 | 19/·083 | 37/16 ,, | 0·117
    0·12 | 37/·064 | 19/13 ,, | 0·125
    0·15 | 37/·072 | 37/15 ,, | 0·15
    | | 37/14 ,, | 0·182
    0·2 | 37/·083 | 37/·083" | 0·2
    0·25 | 37/·093 | 37/·092" | 0·25
    0·3 | 37/·103 | 37/·104" | 0·3
    0·4 | 61/·093 | 61/·092" | 0·4
    0·5 | 61/·103 | 61/·104" | 0·5
    0·6 | 91/·083 | 61/·112" | 0·6
    0·75 | 91/·103 | 91/·101" | 0·75
    0·85 | 127/·083 | |
    1·0 | 127/·103 | 127/·101" | 1·0

TABLE III.--FLEXIBLE CABLES : DIMENSIONS AND RESISTANCE OF
CONDUCTORS.

Number and Diameter of Wires comprising Conductor. | Resistance per 1,000 Yards at 60° F.
Nominal Area. | Diameter, | Diameter, | Diameter, | Diameter, | Standard. | Maximum allowable for Plain | Maximum allowable for Tinned
| 0·010 in. | 0·012 in. | 0·018 in. | 0·029 in. | | Wires. | Wires.

  1. | 2. | 3. | 4. | 5. | 6. | 7. | 8.
    Sq. in. | | | | | Ohms. | Ohms. | Ohms.
    0·01 | 140/·010 | 97/·012 | | | 2·29 | 2·34 | 2·39
    0·0145 | 195/·010 | | 60/·018     | | 1·64 | 1·68 | 1·71
    0·0225 | 296/·010 | | 91/·018 | | 1·08 | 1·11 | 1·13
    0·03 | | 266/·012 | 117/·018     | | 0·847 | 0·864 | 0·881
    0·04 | | 368/·012 | 163/·018 | | 0·606 | 0·618 | 0·631
    0·06 | | 557/·012 | 248/·018     | | 0·400 | 0·408 | 0·416
    0·075 | | 705/·012 | 313/·018 | 121/·029 | 0·316 | 0·323 | 0·329
    0·1 | | | 416/·018 | 160/·029     | 0·238 | 0·243 | 0·247
    0·12 | | | 482/·018 | 186/·029 | 0·206 | 0·210 | 0·214
    0·15 | | | 610/·018 | 235/·029     | 0·163 | 0·166 | 0·169
    0·2 | | | 810/·018 | 312/·029 | 0·122 | 0·125 | 0·127
    0·25 | | | 1017/·018 | 392/·029     | 0·0974 | 0·0993 | 0·101
    0·3 | | | | 481/·029 | 0·0794 | 0·0810 | 0·0826
    0·4 | | | | 646/·029 | 0·0591 | 0·0603 | 0·0614
    0·5 | | | | 792/·029 | 0·0482 | 0·0491 | 0·0501
  • For trailing-cables and similar purposes.

The areas of the conductors in Table III are given in nominal figures,
an addition having been made to the number of wires to give resistances as
nearly as possible corresponding to those for the same areas in Table I.



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

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