§ 25.42. Electrical equipment.
(a) Guarding current-carrying parts. All exposed current-carrying parts except conductors, connected to circuits above 300 volts to ground, shall be isolated, insulated or guarded. Exposed parts less than 300 volts shall be suitably insulated or guarded to prevent possible accidental contact. Exposed metallic parts of conduit armored cable as malding shall be permanently grounded. Current-carrying parts of electrical equipment such as controllers, motors, transformers, automatic cut-outs, circuit breakers, switches and other like devices shall be guarded either by locating them so as to be inaccessible to the operator or routine maintenance personnel, or by enclosing these devices in cabinets, casings, or shields of permanently grounded metal or of substantial insulating material.
(b) Suddenly moving parts. All parts of electrical equipment, such as fuses and the handles and arc chutes of circuit breakers, shall be isolated or guarded that the possibility of persons being stuck or burned is reduced to a minimum.
(c) Noncurrent-carrying parts. All exposed noncurrent-carrying metal parts of electrical equipment shall be permanently grounded. A grounded connection through well bonded track rails will be considered satisfactory.
(d) Operations near electric lines. No one shall operate a crane or hoist so that any part thereof, including the load, is within 6 feet of an electric line, unless either adequate mechanical barriers have been erected or the line has been de-energized.
(e) Warning signs. Warning signs shall be provided as follows:
(1) The owner, lessee or employer responsible for the operation of any crane or hoist shall post and maintain a durable warning sign, legible at 12 feet by the operator in his normal operating position.
(2) The following is a facsimile of the warning sign (not to scale):
UNLAWFUL
TO OPERATE
THIS EQUIPMENT
WITHIN SIX FEET
OF AN ELECTRIC LINE
(3) The warning sign shall consist of white lettering on a red background with at least a 1/4 inch wide white border. The minimum overall dimensions of the sign shall be 10 inches horizontally and 6 inches vertically. Lettering shall follow the horizontal dimensions. The word ‘‘unlawful’’ shall stand alone at the top with letters at least 1 inch in height. The remaining wording shall be printed and spaced on four lines with lettering 5/8 inch in height.
(f) Exception. Subsections (d) and (e) may not apply to the following:
(1) The owner or lessee of overhead electric lines and equipment and his authorized representatives.
(2) Overhead traveling cranes.
(g) Disconnecting source of energy. Readily accessible means shall be provided whereby all conductors and equipment located in cranes can be completely disconnected from the source of energy at a point as close as possible to the main current collectors.
(h) Electrical circuits. The electrical circuit for electric magnets shall be maintained in good condition. Means for taking up the slack cable shall be provided.
(i) Fuses. All fuses shall be of the enclosed arcless type.
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