(ii) For stores, opera houses, theatres, day-run factories, and similar
service, the generator must have a rated capacity of from 30 to 50 per
cent, in excess of the total number of burners installed.
(iii) For saloons and all night or continued service, the generator must
have a rated capacity of from 100 to 200 per cent. in excess of the total
number of burners installed.
(_c_) A small generator must never be installed to supply a large
number of lights, even though it seems probable that only a few lights
will be used at a time. _An overworked generator adds to the cost of
producing acetylene gas_.
5. CARBIDE CHARGES.--Must be sufficient to furnish gas continuously for
the maximum lighting period to all burners installed. In determining
charges lump carbide must be estimated as capable of producing 4-1/2
cubic foot of gas to the pound, commercial 1/4-inch carbide 4 cubic feet
of gas to the pound, and burners must be considered as requiring at least
25 per cent. more than their rated consumption of gas.
6. BURNERS.--Burners consuming one-half of a cubic foot of gas per hour
are considered standard in rating generators. Those having a greater or
less capacity will decrease or increase the number of burners allowable
in proportion.
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