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 Post subject: LOTO testing on circuit breaker with no line voltage
PostPosted: Wed Aug 28, 2019 9:38 am 

Joined: Wed Aug 28, 2019 9:31 am
Posts: 1
How do you verify that a circuit breaker has been effectively lock out if the line side has no power applied? The load side will read zero volts, but since there is no line side voltage you really do not know if the circuit breaker is open?


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 Post subject: Re: LOTO testing on circuit breaker with no line voltage
PostPosted: Mon Sep 09, 2019 6:14 am 
Sparks Level

Joined: Tue Jul 01, 2014 8:40 am
Posts: 98
Hello, could you please provide us with some further information on your situation

Thank you


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 Post subject: Re: LOTO testing on circuit breaker with no line voltage
PostPosted: Mon Sep 23, 2019 5:51 am 

Joined: Mon Apr 06, 2015 9:51 am
Posts: 7
NO NO NO. You need to lock out at a point where you can verify the circuit has been isolated(wires disconnected from the supply, open switch or an open breaker where the line side is live.. The fact that you have zero voltage at this point there is an open device somewhere upstream and you need to find it.


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 Post subject: Re: LOTO testing on circuit breaker with no line voltage
PostPosted: Tue Oct 08, 2019 9:54 am 

Joined: Mon Jul 14, 2014 9:23 am
Posts: 8
If the breaker can not be racked out, then the only way to establish a safe working condition would be meg ohm meter measurement across the open phase poles of the breaker, line to load. An absence of voltage is only good practice after removing circuit links, breakers, fuses and in some cases disconnecting cables, bus or or taps. This ensures any accidental source of energy will not cause a voltage rise in the work area. Many tried and true safety practices require the addition of station grounds in addition to personal protective grounding in the work to limit the voltage gradient the worker will be exposed to.

Key point to remember is requardless of the energy control procedures, testing for the absence of voltage or potential is ENERGIZED WORK until the testing is completed, then and only then is the circuit condition considered by National standards as safe for " competent persons" to work on.

Safety First, Second is Too Late
David Hatton
Hatton Safety Consultants LLC


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