(a) A cable at least as large as one of the incoming
power lines to the generator shall be provided for grounding the generator
shell. This cable shall be permanently fastened on some part of the
generator and shall be grounded in an approved manner.
(b) A suitable screen or guard shall be provided around
high-voltage bushings, and a sign posted warning of high voltage.
This screen or guard shall be so located that it prevents accidental
contact with the high voltage circuit.
(c) In electric boilers of the submerged-electrode
type, the water gage glass shall be located to indicate the water
levels both at start-up and under maximum load conditions as established
by the manufacturer.
(d) Electric boilers of the resistance-element type
shall have at least one gage glass. The lowest visible water level
in the gage glass shall be at least 1 inch (25 mm) above the lowest
permissible water level as determined by the manufacturer. Each boiler
of this type shall be equipped with an automatic low-water cutoff
to cut off the power supply before the surface of the water falls
below the visible level in the gage glass.
(e) Tubular gage glasses on electric boilers shall
be equipped with protective rods or shields.
(f) The minimum relieving capacity for pressure relief
valves on electric boilers shall be 3 1/2 pounds (24 kilopascals)
of steam per hour per kilowatt input.
(g) All electric boilers shall be internally examined
through the electric heating element, removable cover, inspection
opening or handhole as construction allows.
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