Paul,

If you get any replies for a Paul Smith at Teradyne would you please forward
them to my email address at -

[email protected]

Since we are both going to be on this bulletin board, I will try to be sure that
I close with my Teradyne Boston location.

Best Regards,
                    Paul J Smith
               Teradyne, Inc., Boston
               [email protected]
               Voice 617-422-2997
               FAX 603-843-7526






"Paul Smith" <[email protected]> on 08/31/99 08:56:06 AM

Please respond to "Paul Smith" <[email protected]>

To:   [email protected]
cc:    (bcc: Paul J Smith/Bos/Teradyne)
Subject:  US Circuit breaker requirements





Could somebody dispel an 'urban myth' for me.
UL 891 states that circuit breakers in Dead Front Switchboards shall be placed
no higher than 6 1/2 foot (2 metres) from the base of the rack they are
installed in. Thats fine and I can find the references fine in the UL
specification.

But, I am told that they can be placed no lower than 6 inches (or possibly even
18 inches) above the base of the rack they are installed in. This is the 'myth'
I need some information on. I've read UL 891 but haven't found any reference to
this matter in it (or if I did my brain was switched off at that point). What is
the requirement for the minimum mounting height for circuit breakers in Dead
Front Switchboards? Is it covered by UL891, or is it hiding in the NEC
regulations?

Any ideas?

Paul


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