Arc Flash Forum :: View topic - Working on section adjacent to Dangerous!

The income section of a LV switchgear (line-side of main OCPD) has a incident energy of 65 cal/cm2 (Dangerous).

The adjacent section (load side of OCPD) has a incident energy of 3 cal/cm2.

The switchgear is open frame, so there is no barriers between both sections.

What kind of label would you affix to this switchgear?

Options:

1. Only one for the whole panels (incoming and feeder sections) with the AFIE of 65 cal/cm2.
2. Dual label, for incoming section 65 cal/cm2 and for all feeder sections 3 cal/cm2.
3. Other solution.

The problem arises to be so close to a high incident energy area using only PPE of 3 cal/cm2.

Thanks.

Author:	RECS [ Mon Apr 20, 2009 4:36 pm ]
Post subject:	Working on section adjacent to Dangerous!
The income section of a LV switchgear (line-side of main OCPD) has a incident energy of 65 cal/cm2 (Dangerous). The adjacent section (load side of OCPD) has a incident energy of 3 cal/cm2. The switchgear is open frame, so there is no barriers between both sections. What kind of label would you affix to this switchgear? Options: 1. Only one for the whole panels (incoming and feeder sections) with the AFIE of 65 cal/cm2. 2. Dual label, for incoming section 65 cal/cm2 and for all feeder sections 3 cal/cm2. 3. Other solution. The problem arises to be so close to a high incident energy area using only PPE of 3 cal/cm2. Thanks.

Author:	haze10 [ Mon Apr 20, 2009 5:50 pm ]
Post subject:
Without barriers you would have to use the higher rating out to an arc flash boundary that equals the lower rating.

Author:	Gary B [ Tue May 05, 2009 9:39 pm ]
Post subject:
RECS wrote: The income section of a LV switchgear (line-side of main OCPD) has a incident energy of 65 cal/cm2 (Dangerous). The adjacent section (load side of OCPD) has a incident energy of 3 cal/cm2. The switchgear is open frame, so there is no barriers between both sections. What kind of label would you affix to this switchgear? Options: 1. Only one for the whole panels (incoming and feeder sections) with the AFIE of 65 cal/cm2. 2. Dual label, for incoming section 65 cal/cm2 and for all feeder sections 3 cal/cm2. 3. Other solution. The problem arises to be so close to a high incident energy area using only PPE of 3 cal/cm2. Thanks. According to some interpretations operating the main breaker would be illegal because you are above 40Cal/cm2. Working so close is probably no safer and could be more dangerous.

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