I'm making some headway on this but seem to be at a roadblock with the solid
state contactors. Crydom was at one point providing SCCR ratings for their
product with fuses. They have since stopped doing this. What are others doing
to get past the 5kA threshold
To answer my own question it appears that with respect to the inverters the
answer is yes. Was able to find a document saying as much at a manufacturer's
website that provides links to most of their certification documentation. Many
don't.
Kevin
-Original Message-
From: Brian Oconnell [mailto:oconne...@tamuracorp.com]
Sent: Thursday, January 26, 2012 12:49 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Control Panel Interrupt Ratings
Looks like you need to block out some reading time on your schedule.
Insufficient information to determine requirements. SquareD, Siemans, and Eaton
would probably have much info on cb/fuse coordination.
Type 2 coordination is for IEC60947. Look at UL508/508A and CSA No 14, and
their intersection with NEC articles 110, 240, 408, and 690 for interrupt
requirements.
Brian
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Kevin Ambrose
Sent: Thursday, January 26, 2012 7:31 AM
To: emc-p...@ieee.org
Subject: Control Panel Interrupt Ratings
I have a question regarding determining the interrupt rating for a control
panel in the US. In particular I would like clarification for the combination
of inverters (or other equipment) with the manufacturer's recommended fusing.
If the recommendation is followed does the assembly of the 2 components have
the interrupt rating of the fuse? Similarly if I have a solid state contactor
and fuse that limits the let through current to less than the inrush current
resistance what rating does the combination assume.
It is my understanding that this is the case when type 2 coordination is done
with contactor/fuse combinations the fuse rating applies. Does this work the
same way or am I off base.
Thanks
Kevin Ambrose
Control Technologies Inc.
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