Reply: According to subsection 1910.332(a), employees exposed to electric shock or other electrical hazards that are not reduced to a safe level by the electrical installation requirements of sections 1910.303 - 308 must be trained in the electrical safety-related work practices contained in sections 1910.331 - 335. Question 3: Are equipment operators and foremen considered electrically unqualified to evaluate and reset circuit breakers?
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Paragraph (b)(2) prohibits the repetitive manual reclosing of circuit breakers or reenergizing circuits through replacement fuses. Reply: If the breaker referenced in question #1 tripped again, then the circuit and/or equipment must be examined and repaired by a qualified person before it could be reenergized. Question 2: Should an unqualified employee be allowed to reset a circuit breaker more than once without determining the cause of the circuit malfunction? In this situation, an unqualified employee could reset the breaker or replace the fuse once, if doing so would not expose the employee to electrical parts that are energized above 50 volts. However, as the "Note" advises, if employees can verify an overload condition from the de-energized circuit, then no examination is needed before the circuit is reenergized. Reply: Paragraph (b)(2) requires an evaluation to determine whether equipment and circuits can be safely reenergized prior to operating a manual circuit protective device.
Question 1: May unqualified personnel reset a circuit breaker or replace fuses without having a qualified person investigate why the breaker tripped or the fuse blew? Note: When it can be determined from the design of the circuit and the over current devices involved that the automatic operation of a device was caused by an overload rather than a fault condition, no examination of the circuit or connected equipment is needed before the circuit is reenergized. The repetitive manual reclosing of circuit breakers or re-energizing circuits through replaced fuses is prohibited. After a circuit is de-energized by a circuit protective device, the circuit may not be manually reenergized until it has been determined that the equipment and circuit can be safely energized. 1910.334(b)(2), Reclosing circuits after protective device operation.
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