SAFETY MODEL STAGE 3—CONTrOLLING HAZArDS: SAFE WOrK ENVIrONMENT
When You Must Work on or Near Live Circuits
Working on live circuits means actually touching energized parts. Working near live circuits means working close enough to energized parts to put you at risk even though you may be working on de-energized parts. Common tasks where you need to work on or near live circuits include:
❑ taking voltage and current measurements,
❑ opening and closing disconnects and circuit breakers,
❑ racking circuit breakers on and off the bus,
❑ removing panels and dead fronts, and
❑ opening electric equipment doors for inspection.
There should be standard written procedures and training for these com- mon tasks. For instance, when opening and closing disconnects, use the left-hand rule when possible (stand to the right side of equipment with a disconnect on the right, and operate the disconnect with your left hand). For other situations where you might need to work on or near live cir- cuits, your employer should institute a written live-work permit system, which must be authorized by a qualified supervisor.
Live-work permit system A live-work permit should, at least, contain this information:
❑ a description of the circuit and equipment to be worked on and the location,
❑ explanation why the work must be done “live”,
❑ date and time covered by the permit,
❑ a description of the safe work practices to be used,
❑ results of shock hazard analysis and determination of shock protection boundaries,
❑ results of flash hazard analysis and determination of the flash protection boundary,
❑ PPE needed to safely perform the job,
❑ who will do the work and how unqualified persons will be kept away, and
❑ evidence of completion of job briefing, including discussion of job-specific hazards.