All wiring, apparatus, etc., not specifically covered by special rules herein given must conform to the standard rules and requirements of the National Electrical Code, and the term "Theatre" shall mean a building or that part of a building regularly or frequently used for dramatic, operatic, moving picture or other performances or shows, or which has a stage for such performances used with scenery or other stage appliances.

Service

Where supply may be obtained from two separate street mains, two separate and distinct services must be installed, one service to be of sufficient capacity to supply current for the entire equipment of theatre, while the other service must be at least of sufficient capacity to supply current for all emergency lights, where supply feed for emergency lights must be taken from a point on the street side of main service fuses. By "emergency lights" are meant exit lights and all lights in lobbies, stairways, corridors and other portions of theatres to which the public have access, which are normally kept lighted during the performance.

Where source of supply is an isolated plant within the building, an auxiliary service of at least sufficient capacity to supply all emergency lights must be installed from some outside source, or a suitable storage battery within the premises may be considered the equivalent of such service.

Stage

All permanent construction on stage side of proscenium wall, except as hereinafter provided, must be approved conduit or armored cable.

Footlights

Must be wired in approved conduit or armored cable, each lamp receptacle being inclosed with an approved outlet box, or the lamp receptacles may be mounted in an iron or steel box, metal to be of a thickness not less than No. 20 U.S. sheet metal gauge, treated to prevent oxidization, so constructed as to inclose all the wires. Wires to be soldered to lugs of receptacles.

Must be so wired that no set of lamps requiring more than 1,320 watts nor more than 24 receptacles shall be dependent upon one cut-out.

Borders And Proscenium Lights

1. Must be constructed of steel to a thickness not less than No. 20 U.S. sheet metal gauge, treated to prevent oxidization, be suitably stayed and supported, and so designed that flanges of reflectors will protect lamps.

2. Must be so wired that no set of lamps requiring more than 1,320 watts nor more than 24 receptacles shall be dependent upon one cut-out.

3. Must be wired in approved conduit or armored cable, each lamp receptacle to be inclosed within an approved outlet box, or the lamp receptacle may be mounted in an iron or steel box, metal to be of a thickness not less than No. 20 U.S. sheet metal gauge, treated to prevent oxidization so constructed as to inclose all wires. Wires to be soldered to lugs of receptacles.

4. Must be provided with suitable guards to prevent scenery or other combustible material coming in contact with lamps. •

5. Cables for borders must be of approved type and suitably supported; conduit construction must be used from switchboard to point where cables must be flexible to permit of the raising and lowering of border.

6. For the wiring of the border proper wire with approved slow-burning insulation must be used.

7. Borders must be suitably suspended, and if a wire rope is used same must be insulated by at least one strain insulator inserted at the border.

Stage And Gallery Pockets

Must be of approved type, controlled from switchboard, each receptacle to be of not less than 35-ampere rating for arc lamps nor 15-ampere rating for incandescent lamps and each receptacle to be wired to its full capacity. Arc pockets to be wired with wire not smaller than No. 6 B. & S. gauge and incandescent pockets with not less than No. 12 B. & S. gauge.

Plugs for arcs and incandescent pockets must not be interchangeable.

Scene Docks

Where lamps are installed in scene docks they must be so located and installed that they will not be liable to mechanical injury.

Curtain Motors

Must be of ironclad type and installed so as to conform to the requirements of the National Electrical Code.

Control For Stage Flues

In cases where dampers are released by an electric device, the electric circuit operating same must be normally closed.

Magnet operating damper must be wound to take full voltage of circuit by which it is supplied, using no resistance device, and must not heat more than normal for apparatus of similar construction. It must be located in the loft above the scenery, and be installed in a suitable iron box with a tight, self-closing door.

Such dampers must be controlled by at least two standard, single pole switches mounted within approved iron boxes provided with self-closing doors without lock or latch, and located, one at the electrician's station and others as designated by the inspection department having jurisdiction.

Dressing Rooms

Must be wired in approved conduit or armored cable. All pendent lights must be equipped with approved reinforced cord, armored cable or steel armored flexible cord.

All lamps must be provided with approved guards.

Portable Equipment

Arc lamps used for stage effects must conform to the following requirements:

1. Must be constructed entirely of metal except where the use of approved insulating material is necessary.

2. Must be substantially constructed, and so designed as to provide for proper ventilation, and to prevent sparks being emitted from lamps when same are in operation, and mica must be used for frame insulation.

3. Front opening must be provided with a self-closing hinged door frame, in which wire gauze or glass must be inserted, except in the case of lens lamps, where the front may be stationary, and a solid door be provided on back or side.

4. Must be so constructed that neither carbons nor live parts will be brought into contact with metal of hood during operation, and arc lamp frames and standards must be so installed and protected as to prevent the liability of their being grounded.