✨ Electrical Standards and Regulations
SEPT. 6.] THE NEW ZEALAND GAZETTE. 2571
TABLE XIV.—APPROXIMATE FUSING CURRENTS OF LEAD-TIN ALLOY WIRES IN FREE AIR (LEAD 75 PER CENT., TIN 25 PER CENT.).
| Size. | Diameter of Wire. | Fusing Current. | Maximum Safe-working Current. |
|---|---|---|---|
| 1. | 2. | 3. | 4. |
| S.W.G. | In. | Amps. | Amps. |
| 25 | 0·020 | 3 | 2 |
| 24 | 0·022 | 3·5 | 2·3 |
| 23 | 0·024 | 4 | 2·6 |
| 22 | 0·028 | 5 | 3·3 |
| 21 | 0·032 | 6 | 4·1 |
| 20 | 0·036 | 7 | 4·8 |
| 18 | 0·048 | 10 | 7 |
| 16 | 0·064 | 16 | 11 |
The table refers to wires in free air and of the following lengths: 2½ in. to 3½ in.
TABLE XV.—FLEXIBLE CORDS: TYPE OF COVERING TO BE USED (REG. 23–61).*
| Use. | Situation. |
|---|---|
| Dry. | |
| Pendants | Any |
| Appliances— | |
| (a) Not subject to hard usage | Any except (i) |
| (b) Subject to hard usage | (c), (d), (e), (f), and (j) |
| Lifts (Trailing-leads) | (c), (e), (f), (g), and (j). |
- For types of insulation see Regulation 23–31.
Extract from Regulation 23/61.
(a) Braiding of natural silk or of artificial silk.
(b) Glace-cotton braiding.
(c) Hemp, cotton, jute, or other suitable braiding thoroughly compounded.
(d) Wire armouring, comprising a flexible braiding of galvanized steel or bronze wire in addition to the covering specified in paragraph (c).
(e) Hard-cord braiding in addition to the covering specified in paragraph (c).
(f) Tough rubber sheathing in accordance with Regulation 23–71.
(g) Flame-resisting braiding.
(h) Varnished cotton or silk waterproof braiding.
(i) Thin tough rubber compound over twisted conductors.
(j) Rubber compound with braiding overall.
(k) Thin tough rubber compound over conductors made up to a circular or oval section with hemp, cotton, or jute filing.
TABLE XVI.—SIZE OF EARTHING-LEAD IN METAL SHEATHED AND TOUGH RUBBER SHEATHED CABLES.
| Size of Current-carrying Conductor. | Approximate Minimum Cross-sectional Area of Earthing-lead. | Minimum Number and Diameter (in.) of Wires forming Earthing-lead. | |||
|---|---|---|---|---|---|
| Number and Diameter (in.) of Wires. | Nominal Cross-sectional Area. | Metal Sheathed Cables. | Tough Rubber Sheathed Cables. | ||
| 1. | 2. | 3. | 4. | 5. | 6. |
| Sq. in. | Sq. in. | Single-core. | Twin and Three-core. | Single-core. | |
| 1/·044 | 0·0015 | 0·001 | 3/·020 | 1/·036 | 9/·012 |
| 3/·029 | 0·002 | 0·001 | 3/·020 | 1/·036 | 9/·012 |
| 3/·036 | 0·003 | 0·0015 | 5/·020 | 1/·044 | 14/·012 |
| 7/·029 | 0·0045 | 0·0015 | 5/·020 | 1/·044 | 14/·012 |
| 7/·036 | 0·007 | 0·0015 | 5/·020 | 1/·044 | 14/·012 |
| 7/·044 | 0·01 | 0·0015 | 5/·020 | 1/·044 | 14/·012 |
| 7/·052 | 0·0145 | 0·002 | 7/·020 | 1/·052 | 19/·012 |
| 7/·064 | 0·0225 | 0·003 | 10/·020 | 1/·064 | 28/·012 |
| 19/·044 | 0·03 | 0·004 | 13/·020 | 1/·072 | 37/·012 |
| 19/·052 | 0·04 | 0·005 | 17/·020 | 1/·083 | 47/·012 |
| 19/·064 | 0·06 | 0·005 | 17/·020 | 1/·083 | 47/·012 |
(See Regulation 43–16 (1) (c).)
A. W. MULLIGAN,
Acting Clerk of the Executive Council.
(P.W. 26/218/12.)
By Authority: G. H. LONEY, Government Printer, Wellington.
Price 1s. 6d.]
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VUW Te Waharoa —
NZ Gazette 1935, No 65
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NZ Gazette 1935, No 65
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Approximate Fusing Currents of Lead-Tin Alloy Wires in Free Air
(continued from previous page)
🏗️ Infrastructure & Public WorksLead-Tin Alloy Wires, Fusing Currents, Electrical Standards, Safe-working Current
🏗️ Flexible Cords: Type of Covering to be Used
🏗️ Infrastructure & Public WorksFlexible Cords, Covering Types, Electrical Regulations
🏗️ Size of Earthing-Lead in Metal Sheathed and Tough Rubber Sheathed Cables
🏗️ Infrastructure & Public WorksEarthing-Lead, Metal Sheathed Cables, Tough Rubber Sheathed Cables, Electrical Standards
- A. W. Mulligan, Acting Clerk of the Executive Council