(_d_) Generators must be placed where water will not freeze.
3. ESCAPES OR RELIEF-PIPES.--Each generator must be provided with an
escape or relief-pipe of ample size; no such pipe to be less than 3/4-
inch internal diameter. This pipe shall be substantially installed,
without traps, and so that any condensation will drain back to the
generator. It must be carried to a suitable point outside the building,
and terminate in an approved hood located at least 12 feet above ground
and remote from windows.
The hood must be constructed in such a manner that it cannot be
obstructed by rain, snow, ice, insects or birds.
4. CAPACITY.--(_a_) Must be sufficient to furnish gas continuously
for the maximum lighting period to all lights installed. A lighting
period of at least 5 hours shall be provided for in every case.
(_b_) Generators for conditions of service requiring lighting period
of more than 5 hours must be of sufficient capacity to avoid recharging
at night. The following ratings will usually be found advisable.
(i) For dwellings, and where machines are always used intermittently, the
generator must have a rated capacity equal to the total number of burners
installed.
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