(_c_) Purifiers must contain no carbide for drying purposes.
(_d_) Purifiers must be located inside of gasholders, or, where
necessarily outside, must have no hand-holes which can be opened without
first shutting off the gas-supply.
24. PRESSURE REGULATORS.--(_a_) Must conform to the rules for the
construction of other acetylene apparatus so far as they apply and must
not be subject to sticking or clogging.
(_b_) Must be capable of maintaining a uniform pressure, not varying
more than four-tenths inch water column, at any load within their rating.
(_c_) Must be installed between valves in such a manner as to
facilitate inspection and repairs.
_Class B.--Stationary Apparatus for Central Station Service._
Generators of over 300 lights capacity for central station service are
not required to be automatic in operation. Generators of less than 300
lights capacity must be automatic in operation and must comply in every
respect with the requirements of Class A.
25. GENERAL RULES. GENERATORS.--(_a_) Must be substantially
constructed of iron or steel and be protected against depreciation by an
effective and durable preventive of corrosion.
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