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Aug., 1930] ASPECTS OF NATIONAL ELECTRICAL CODE 153
dors leading to such rooms. This applies equally to rooms in which sound film recording machinery is located.
There seems to be considerable difference of opinion regarding the real necessity for vapor proof fixtures. One inspection department in New York requires vapor proof fixtures but will also accept the use of a metal dish under the lamp when located in film working rooms; in other words, a fixture similar to the totally indirect unit. This is merely a precaution to catch the hot filament of a broken lamp and prevent its dropping upon and igniting film.
If this practice is sound, the problem of properly lighting film work rooms is not a serious one as many commercial type fixtures can be obtained in this form. However, if the use of vapor proof fixtures is enforced in all locations, the problem of good lighting will assume a more complicated and expensive form.
New local rules in New York prohibit the use of chain fixtures with cords laced in and out of the rings, or drop cords in rooms where film is handled. All such units must have the fixture wires properly enclosed in a metal pipe stem. This applies as well to Wratten safelight units which heretofore were connected by means of a flexible cord into a lamp receptacle located at some convenient point near the safelight.
The question has been raised regarding the use of wall switches in rooms where film is handled. The Code now prohibits the use of switches in vaults but serious thought is also being given to the advisability of requiring the use of vapor proof type switches in all rooms where film is handled.
Attention is also being given to the use of wall fans in similar locations, especially of the types with commutators and with rheostats in the bases.
To definitely establish in the minds of the Code Committee whether there is a necessity for such devices will depend largely on a definite conclusion regarding the combustibility or explosiveness of the gases which are given off by motion picture film under ordinary conditions. These facts can best be obtained from the membership of our own Society, and any discussions or suggestions offered by you will be gladly received and considered by the Code Committee of the National Fire Protection Association.
EXIT AND EMERGENCY LIGHTS
Another section of the Code that is receiving the attention of the Code Committee deals with the matter of emergency lighting. Sev