JULY 12.] THE NEW ZEALAND GAZETTE. 2411

shall not be reduced by means of a resistance or resistances in circuit with the apparatus, but by double-wound transformers or motor generators.

PART IX.—PLACES OF PUBLIC AMUSEMENT.

GENERAL.

233. (1) The regulations in this Part shall apply to theatres, music-halls, motion-picture theatres, and public halls, and embody special requirements in addition to any other requirements of these regulations.
     (2) In case of any dispute as to whether a place is a public hall the matter shall be submitted to the Chief Electrical Engineer, whose decision shall be final.

234. All fixed wiring shall be enclosed in Class T metal conduits as specified in Part III of the Second Schedule hereto.

235. (1) The stage-switchboard shall be either of the dead-front type, or the accessories shall be of the totally enclosed type.
     (2) A metal hood approved by the Authorized Inspector and extending the full length of the board shall be fitted at the top of the switchboard to protect it from falling objects.
     (3) The switchboard shall be fixed in a convenient position, preferably overlooking the stage, and inaccessible to all but the switchboard operator.
     (4) A platform with proper means of access shall be provided for the switchboard operator. The platform shall be of fire-resisting material, with a hardwood or other insulating floor. The handrail of the platform, if of metal, shall not be connected directly or indirectly to earth.
     (5) Switchboards and fuse-boards shall be fixed in accessible positions where they will not obstruct passages or exits.

236. (1) Resistances shall be mounted on incombustible bases, and shall be so protected and placed at such a distance from any combustible material that no part of the resistance, if broken, can fall on such material, or vice versa.
     (2) The resistances shall be provided with adequate ventilation.

237. Stage-lighting, including footlights, border-lights, and proscenium side lights, shall be so wired that the maximum current on each circuit shall not exceed 10 amperes.

238. Cables to battens and floats shall be suspended in such a manner that no stress can be applied by the conductors to any terminal to which they may be connected, and shall be either—
     (a) Flexible cables covered with tough-rubber compound; or
     (b) Vulcanized rubber insulated cables containing not less than seven strands for each conductor and enclosed in canvas hose; or
     (c) Flexible cables covered with a slow-burning braiding approved by the Chief Electrical Engineer; or
     (d) Flexible cables covered with asbestos or fire-resisting braiding approved in accordance with paragraph (g) of Regulation 93 hereof; or
     (e) Flexible cables covered with hard cord braiding.

239. Stage-plugs shall be of a design approved by the Chief Electrical Engineer, so constructed that dirt and dust cannot accumulate in the socket, and so that the contact surfaces cannot be readily short-circuited.

240. (1) Lamps on battens, footlights, &c., shall be protected by stiff wire guards so arranged that no scenery or other inflammable material can come in contact with the lamps, and shall be properly protected from everything liable to cause short-circuit.
     (2) No readily combustible material shall be used in connection with any lamps in such a manner that it might come in contact with the lamps or conductors.

241. Every electrical fitting or apparatus of any description shall be so fixed or arranged that under no circumstances can it interfere with the proper working of the safety-curtain.

242. (1) Portable lamps for the orchestra or similar lighting shall be connected to a subcircuit or subcircuits to which no other lighting is connected.
     (2) Outline or exterior lighting shall be connected to a subcircuit or subcircuits to which no other lighting is connected.

SPECIAL AS TO MOTION-PICTURE THEATRES.

243. Conductors from the switchboard in the projection-room to the cinematograph machine shall be enclosed in screwed conduit, and terminate in a terminal-box approved by the Authorized Inspector. Conductors from such box to the lamp shall be covered with fire-resisting material.

244. (1) The conductors for cinematograph machines and accessories shall be taken as a separate circuit from the source of supply, or from the supply side of the main fuses in the general lighting-circuit; and there shall be efficient switches and fuses inserted at the point where the supply is taken, and in addition an efficient double-pole switch shall be fitted in the conductors within the projection-room.
     (2) The maximum potential difference across the carbons of the lamp or between any part of the arc-circuit on the cinematograph machine and earth shall not exceed 110 volts under any circumstances.
     (3) Resistances for cinematograph machines shall be placed inside the projection-room.

PART X.—HIGH AND EXTRA-HIGH PRESSURES.

HIGH AND EXTRA-HIGH PRESSURE APPARATUS.

245. The regulations in this Part shall apply to high and extra-high pressure apparatus within consumers’ premises, and embody special requirements in addition to any other requirements of these regulations or of the Electrical Supply Regulations 1927.

246. Transformers shall not be installed in buildings except by permission of the supply authority’s Electrical Engineer.

247. Oil circuit-breakers shall be of the loose-handle type, and provision shall be made to isolate the oil circuit-breaker from the supply.

248. (1) High or extra-high pressure wiring shall consist of earthed metal-sheathed cable protected from mechanical injury.
     (2) The cable shall be in accordance with British Standard Specification No. 7, or other types approved by the Chief Electrical Engineer, and shall terminate at each end in a terminal-box filled with compound.

249. Motors shall not be installed in situations other than motor-rooms specially constructed for the purpose, without the approval of the supply authority’s Electrical Engineer.

250. (1) Every motor and converter shall be protected and controlled by efficient means, suitably placed and so connected that all pressure may thereby be cut off from the motor or converter, as the case may be, and from all apparatus in connection therewith.
     (2) Efficient means shall be provided outside the motor-room for stopping the motor in case of accident.

251. In this Part of these regulations the term “supply authority’s Electrical Engineer” shall mean the Chief Electrical Engineer in cases where the supply authority is not an Electric-power Board, County Council, Borough Council, or Town Board.

PART XI.—EARTHING.

SPECIFYING WHAT SHALL BE EARTHED.

GENERAL.

252. The following shall be effectively earthed to the satisfaction of the Authorized Inspector:—
     (a) Metal sheathings of Class M cable.
     (b) Metallic envelopes of Class R armoured cables.
     (c) Screwed conduit, Class T.
     (d) The bed-plates and frames of generating plant.
     (e) The frames of all motors and starters of machines of 1 horse-power or over.
     (f) The frames of all motors and starters of machines of under 1 horse-power where it is possible for a person touching the frames to make contact simultaneously with earth.
     (g) All cases, frames, or metal enclosures of static transformers and choke-coils.
     (h) One side of the secondary winding of double-wound transformers used in connection with wiring systems having extra-low-pressure control circuits, and all metal protecting cases of such transformers.
     (i) One side of the secondary winding of double-wound bell-ringing transformers and all metal protecting cases of such transformers.
     (j) Metal cases and metal framework (if any) of ironclad switch-gear.
     (k) The support and frame of every fixed heating and cooking appliance.
     (l) Ironclad elements of all electric ranges.
     (m) The metal framework of electric signs.
     (n) All metal liable to become alive from any cause when such metal is in damp situations or in places where the conditions are such that a person touching it would be likely to be simultaneously making contact with earth.