New Zealand Gazette – 1927 – No. 48

Page 2413

✨ Electrical Wiring Regulations

JULY 12.] THE NEW ZEALAND GAZETTE. 2413

The contractor carrying out any installation shall notify the Electrical Supply Authority in writing of the completion thereof, and, except as provided in Regulation 284 hereof, shall not allow the current to be switched on from the source of supply until the installation has been duly inspected and he has been notified that a certificate has been issued pursuant to Regulation 283 hereof.
(1) Manholes not less than 16 in. by 14 in. in area shall be provided in ceilings to facilitate access to the roof of every building for the purposes of inspection.

(2) Traps shall be provided at all inspection fittings and draw-in boxes, and such traps shall be securely fastened by means of screws.

TESTS TO BE MADE.

(1) The Authorized Inspector shall, on the installation as a whole and on the individual circuits thereof, make a test of insulation resistance between conductors and between conductors and earth.

(2) Such test shall be deemed to be satisfied if the insulation resistance is not less in megohms than the result of dividing the number 30 by the number of points under test.

(1) In the case of lighting circuits a test of insulation resistance between conductors and earth shall be made by the Authorized Inspector when the whole of the lamps and accessories have been connected to the conductors, and such test shall be carried out with all switches in the "on" position and all fuses in circuit.

(2) Such test shall be deemed to be satisfied if the insulation resistance to earth is not less in megohms than the result of dividing the number 25 by the number of lamps in circuit.

(1) A test shall be made by the Authorized Inspector of the insulation resistance between the case or framework and every live part of each individual dynamo, motor, or arc lamp, and of each electrical appliance, complete with its control gear or other accessory apparatus.

(2) Such test shall be deemed to be satisfied if the insulation resistance is not less in each case than 1 megohm.

(1) In all cases where metal conduits or metallic sheathing or cables are used for the mechanical protection of electrical conductors such conduits and envelopes shall be tested for electrical continuity.

(2) The test shall be carried out between a point near the main switch and any other point of the completed installation.

(3) The test shall be deemed to be satisfied if the electrical resistance of such conduit or sheathing does not exceed 2 ohms.

CERTIFICATION.

(1) After having inspected and tested an installation, the Authorized Inspector, if satisfied that the work has been done in a workmanlike manner in accordance with the requirements of these regulations, and if the tests made as required by the foregoing provisions of this Part of these regulations have been satisfied, shall certify in writing to the Electrical Supply Authority that the installation has been duly inspected and tested and may be safely connected with the source of supply.

(2) Nothing in any such certificate shall relieve the owner or occupier of any premises from the obligation to bring any installation into conformity with these regulations if on any subsequent inspection any defects are discovered which render such installation electrically hazardous.

(1) Notwithstanding anything to the contrary in the foregoing provisions of this Part of these regulations, the supply authority may, in case of urgency, on the recommendation of the Authorized Inspector, permit an installation to be temporarily connected with the source of supply notwithstanding that any one or more of the hereinbefore-prescribed insulation resistance tests have not been satisfied; provided that no such permit shall be granted unless the installation otherwise generally complies with the requirements of these regulations, and is certified by the Authorized Inspector to be reasonably free from electrical hazard, or for a longer period than one month; provided, further, that the Chief Electrical Engineer, on the recommendation of the supply authority, may extend such period beyond one month.

(2) On the expiration of the period or extended period as aforesaid for which temporary connection has been so permitted the installation shall be disconnected from the source of supply, unless before such expiration the Authorized Inspector has issued his certificate pursuant to the last preceding regulation.

WHERE SUPPLY AUTHORITY IS WIRING CONTRACTOR.

Where an electrical supply authority itself contracts to carry out any installation for a consumer, the following special provisions shall apply:-

(a) The notice required by Regulation 277 hereof need not be given.

(b) The certificate to be issued pursuant to Regulation 283 hereof shall be a certificate by the Supply Authority to the Chief Electrical Engineer.

INSPECTION ON BEHALF OF MINISTER.

(1) Any person authorized in writing in that behalf by the Minister may at any time, between the hours of 9 a.m. and 5 p.m. on any day of the week other than Sunday, demand admission to the premises of any consumer for the purpose of ascertaining whether the requirements of these regulations have been complied with.

(2) If any consumer refuses to admit such person during such hours the Electrical Supply Authority shall on demand in writing by the Chief Electrical Engineer disconnect the consumer's installation from the source of supply.

SCHEDULES.

FIRST SCHEDULE.

LIST OF BRITISH STANDARD SPECIFICATIONS REFERRED TO IN THE REGULATIONS.

(Obtainable from the British Engineering Standards Association, 28 Victoria Street, S.W. 1, or Messrs. Crosby, Lockwood, and Son, 7 Stationers' Hall Court, Ludgate Hill, E.C. 4, price 1s. 2d. post free.)

Title. Specification
No.
Bus-bars and connections, marking for .. 158-1924
Bus-bars and connections, specification for .. 159-i1924
Ceiling roses, two and three plate, specification for 67-1914
Circuit-breakers, air-brake, for voltages not exceeding 660 volts, specification for .. 110-1923
Circuit-breakers, flame-proof air-break, for voltages not exceeding 660 volts, specification for 127-1923
Circuit-breakers, totally enclosed air-break, for voltages not exceeding 660 volts, specification for .. 130-1923
Conduits, steel, and fittings for electrical wiring, specification for .. 31-1923
Controllers, contactor, and resistances for use therewith for electric motors, specification for 129-1923
Controllers, drum, and resistances for use therewith for electric motors, specification for .. 118-1923
Copper conductors, insulated annealed, for electric power and light, dimensions of .. 7-1922
Copper wire, bare annealed, for electrical machinery and apparatus, dimensions and resistances of .. 128-1922
Cut-outs, electric (low pressure, type O), specification for .. 88-1919
Fittings, watertight, for incandescent electric lamps, specification for .. 97-1920
Generators, industrial electric, and motors with class A insulation, electrical performance of, specification for .. 168-1923
Glands, watertight, for electric cables, specification for .. 94-1920
Indicating ammeters, voltmeters, wattmeters, frequency and power-factor meters, specification for .. 89-1919
Lamp-caps and lampholders, goliath, specification for .. 98-1919
Lampholders, ordinary size bayonet, specification for .. 52-1924
Lamps, electric, normal type vacuum and gas-filled tungsten filament, specification for .. 161-1924
Motors, electric, starters for, specification for .. 82-1919
Motors, industrial electric, and generators with class A insulation, electrical performance of, specification for .. 168-1923
Resistance materials, metallic, for electrical purposes, specification for .. 115-1921
Slate slabs for electrical purposes, specification for 160-1923
Sockets, electric-cable soldering, specification for .. 91-1921
Starters, auto-transformer (hand-operated pattern) for electric motors, specification for .. 167--1923
Starters, contactor, for electric motors, specification for .. 155-1923
Starters, drum, for electric motors, specification for .. 117-1923

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VUW Te Waharoa — NZ Gazette 1927, No 48

NZLII — 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, Earthing, Steel Construction, Machinery, Heating Appliances, Cooking Appliances, Water Heaters, Bathrooms, Switches, Earthing-Leads, Inspection, Testing

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