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Thread: 24 vdc control - 480 vac power single enclosure -work in control side while energized

  1. #11
    Join Date
    Aug 2004
    Location
    Northern illinois
    Posts
    16,846
    I think the question that has to be asked is if there is a risk of arc flash from working in another cabinet how is that any different than the risk of arc flash just from walking in front of the cabinet? The cabinet does not contain the arc flash anyway so any openings between the cabinets are not especially significant.
    Bob

  2. #12
    Join Date
    Oct 2017
    Location
    Pittsburgh, PA, USA
    Posts
    6
    I too would be interested in further discussion on this point. I am faced with a similar request of a customer and need to determine a safe solution that meets any relevant codes. I have the same basic opinion as jreaf, that a simple divider just would not protect from a potential blast. Regardless of the cause, dropped tool, cross wire, dust kicked up by a draft, an arc flash in the unprotected face of an unsuspecting electrician will surely work it's way through the easiest path to escape.

    The question is then, what is safe enough?

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  3. #13
    Join Date
    Feb 2003
    Posts
    153
    Look into Hoffman’s sequestor line of enclosures. That be an option.

  4. #14
    Join Date
    Oct 2017
    Location
    Pittsburgh, PA, USA
    Posts
    6
    Quote Originally Posted by wireman View Post
    Look into Hoffman’s sequestor line of enclosures. That be an option.
    Thanks for the reply wireman, but I am really hoping to answer the question of safety in keeping to the original posters question and separation inside of a single cabinet. I did review your suggestion and the ones earlier and neither will work well in my situation.

    I am trying to focus on this because of my customers push for a separation and my bosses acceptance of that solution. I would like to refute their decision with some code examples that they can't argue against. Right now they are just looking at the dollars which is a poor deciding factor.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  5. #15
    Join Date
    Oct 2015
    Location
    Fort Wayne, IN
    Posts
    4
    Major problem is, can you show the AHJ or OSHA, any testing and documentation that the hazard is mitigated between the potential arc flash side and the lower voltage side? This requires a cabinet that has been fully tested and qualified by an appropriate testing authority (either CE or UL), like other's have said, their is no 'DIY' solution. So, unless you are willing to submit to UL for testing and have listed properly (which is going to cost way more than purchasing an enclosure that has already been certified and tested for such), you would be better off purchasing a cabinet certified and listed for such. Plus in most states you as the provider of the product to the end customer, will be liable for a minimum of 10 years for any liability issues (called in most states the "Statute of Repose"). This is not legal advice, but I wouldn't want to be liable for that product without proper testing for 10 years myself.

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