Brian,
I let others address your specific de-rating questions ... although I think
you're headed in the right direction. I believe de-ratings do 'stack' as you
suggest.
An additional issue of importance is to ensure the terminals where these wires
eventually connect are also rated for the temperatures they will experience. It
looks like you are expecting your copper conductor to be around 50ºC. You need
to ensure any terminal blocks, device terminals, etc.. are rated for that
temperature also.
Regards,
Lauren Crane
Product Regulatory Analyst
Corporate Product EHS Lead
Applied Materials Inc.
Austin, TX 512 272-6540 [#922 26540]
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"Kunde, Brian" <[email protected]>
Sent by: [email protected]
02/02/2009 01:48 PM To
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Subject
De-Rating Hookup Wire
I want to make sure I’m properly de-rating the current capacity of hook-up
wire.
A 105º hookup wire size 10 AWG is rated 58 amps at 30ºC.
At 50ºC (40ºC out side temp and 10ºC internal temp rise) I have to de-rate by
.86 which would now make it handle only 49.9 amps.
If I bundle 2 to 5 wires together, I have to de-rate another .8 which would
make it only rated for 39.9 amps.
So do I de-rate the de-rated value or is there some other method that is more
correct?
What is considered a “Bundle”? If I cable tie 2 wire together is this
considered a bundled?
Is there an additional de-rating for wire length of hookup wire? I assume wire
length only affected voltage drop, not current rating.
Thanks to all for your help.
The Other Brian
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