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1948-49 Theatre Catalog, 7th Edition, Page 60 (49)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 60
Page 60

1948-49 Theatre Catalog, 7th Edition, Page 60

should be made for installation of two generator sets or two rectifiers, or one of each. The extra equipment is for standby protection in case of failure of the first generator or rectifier. All motors should be equipped with externally operated line diSConnect switches ahead of the motor starter or controller.

Provide conduit and wiring for dc current from the generator through necessary grid type rheostats to a dc panel set Hush in the projection booth wall. This panel should be equipped I with four 2-pole, double throw, front knife-connected switches with N.E.C. fuse connections in each throw. Two of these switches feed the projection machines, one the spot or flood lamp, and one will be a spare.

The size of the motors for the generator sets will vary with the size of the theatre and the equipment used. The average load will require from 71/2 to 10 hp. for each generator. However, it will be good engineering to provide conduit and wiring capacity for two 15 hp. motors, so that no change will be necessary to take care of the contemplated higher amperage arcs which will be required for the new type of film which is now starting to come through.

The type and manufacturer of projection booth equipment should be determined and a diagrammatic layout of the necessary conduit and wiring for both projection and sound equipment obtained, which can be adapted to the particular projection room layout. Provision should be made for conduit and wiring for control switches at each machine to operate the curtain machine, also wall receptacles for trouble lights and soldering iron, clock, and for automatic rewind equipment. Wiring diagrams for change-over equipment and necessary foot switches should be obtained from the equipment manufacturer.

In some localities it is a code requirement to install in the projection booth an automatic emergency control switch, connected with the automatic shutter control for projection booth ports, ventilation shutters, projection booth exhaust fan, the main supply and exhaust fans, and the auditorium lighting. This switch should be operated both by melting of a fusible link and manually.

Power Panel

The main power panel should be located in the machine room and close to the largest power load. This panel will control the current for motors for the ventilation fans, the air conditioning equipment, ejector and sump pumps, oil burner, and so forth. The main feeder supplying this panel will usually feed from the main power service through a separate power meter. This setup however will be determined by the service companyis rates, which should be investigated and the layout should conform to the recommendations which will provide for the lowest charge for light and power service in the particular locality.


Outside telephone service should be Provided in the boxofiice with an extensmn to the managers office. Outside service should also be provided for pay


stations, in the main lounge or the foyer.


Conduit wiring and transformers should be provided for a system of buzzers, required for efficient operation, and should include one from the boxoffice to managers office, one from doormanis station to foyer, and one from inside of standee rail to booth for regulating the volume of sound. Also one from the managers office to doorman, and one with return call from projection booth to stage.

Inter-Communicating Telephones

Provision should be made for a complete intercommunicating telephone system with stations in the managers office, boxoffice, projection room, stage, and in some cases in the machine room.

Curtain Control

Three control switches will be furnished with the curtain control machine. Two of these should be located in the projection room front wall adjacent to each observation port, and one at a convenient location on the stage.

Miscellaneous Small Motor Wiring

Make provision for conduit and wiring for drinking water cooler, projection booth exhaust fans (on emergency circuit) and other small equipment motors.

Exit Lighting

Pertinent codes should be checked for requirements for exit lighting. In general these will consist of exit signs over each regular and emergency exit, also at stairs, and so forth, and an exterior outlet over each emergency exit. Requirements as to size and color of lettering in exit signs differ but eight inch

IN MOST THEATRES the marquee and front lighting represent a major power load that looms large in the k.w. consumption reflected by the power company's bill. Numerous separate controls should be provided for management economy.

red letters reading ffexit" is the standard requirement. Some codes permit 6-inch letters, and some require the letters to be green instead of red. In some cases it is the requirement that each exit sign be numbered and these numbers correspond with an exit diagram furnished to each patron.

The exterior exit lights should have weather-proof sockets with a strong wire guard, to prevent stealing and breaking of the lamp.

Aisle Lights and Step Lights

Aisle lights should be located on end seat standards every fourth row, staggered for aisles with seating on both sides, and every second row for side aisles. Seat standards have provision for these lights and the fixture and fittings will be furnished'by the seat manufacturer. Conduit fittings or door boxes in the floor located to clear the standard and the seat when it is raised should be provided. The connection between the condulet or floor box should be with BX. Floor boxes should be water-proof.

Step lights should be provided at every change in level of the door, not otherwise sufiiciently lighted. These sometimes occur at the last rows of seats where steps are required from the aisles to the seat bank levels. Step lights will also be required in balcony aisles, vomitories, and so forth.

General Lighting Recommendations

The tendency of most designs is to over-emphasize the lighting in the auditorium proper, with coves, large side wall brackets, special effects, and so forth, which, on account of audience distraction and also on account of current and maintenance cost are seldom used after the first few weeks. Therefore it is good planning to provide for only necessary lighting properly to light the auditorium between performances, emergency and exit lighting, a certain amount of lighting which is used during the showing of the picture, and lighting for the- stage setting.

If the general lighting is controlled through dimmers, the same wire, fixtures, and so forth, can be used for both the full lighting and the picture lighting, and the intensity most flattering to ' the picture can be used by proper setting of the dimmer. Dimmers which do not use current through resistance are the type for this purpose. This method is very fiexible and especially appreciated for technicolor presentations. All conduit and wiring, panel boards, and so forth, should comply with the requirements of the National Electric Code and the local codes, and provision should be made in panel and feeder sizes for additional future loads, which may be necessitated by change of outdoor signs, addition of display lighting, etc.

Convenience Outlets

Convenience outlets should be located in all areas for incidental lamps, pin spots in the lobbies, and not over 50 feet apart for connection for vacuum cleaners. Some fioor outlets in orchestra, mezzanine, and balcony just off the aisles will be required for this purpose.
1948-49 Theatre Catalog, 7th Edition, Page 60