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 Post subject: Working on section adjacent to Dangerous!
PostPosted: Mon Apr 20, 2009 4:36 pm 
Sparks Level

Joined: Sat Apr 04, 2009 9:50 pm
Posts: 104
Location: San Antonio, TX
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.


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 Post subject:
PostPosted: Mon Apr 20, 2009 5:50 pm 
Arc Level

Joined: Thu Jan 10, 2008 8:49 pm
Posts: 498
Location: New England
Without barriers you would have to use the higher rating out to an arc flash boundary that equals the lower rating.


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 Post subject:
PostPosted: Tue May 05, 2009 9:39 pm 
Sparks Level

Joined: Thu Oct 18, 2007 7:10 pm
Posts: 261
Location: NW USA
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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