Standard Interpretations - Table of Contents
• Standard Number: 1910.334(b)(2); 1910.333(c)(2)

November 19, 2001

Mr. Edward M. Corcoran
EMC Code Consultants
12114 Country Lane
Burlington, WA 98233

Dear Mr. Corcoran:

Thank you for your May 24, 2001, letter to the Occupational Safety and Health Administration's (OSHA's) Office of General Industry Compliance Assistance (GICA). This letter constitutes OSHA's interpretation only with respect to the requirements discussed and may not be applicable to any scenario not delineated within your original correspondence. You made specific statements regarding your understanding of 29 CFR 1910.334(b)(2) and asked for our comments on your interpretation. Your statements have been paraphrased into questions in this response.

1910.334(b)(2), Reclosing circuits after protective device operation. 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. The repetitive manual reclosing of circuit breakers or re-energizing circuits through replaced fuses is prohibited.

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.

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?