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Old 02-16-2018, 04:52 PM   #1
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What is the problem with bundling wires like in zip ties in a panel. I've never I understood it because they're together in conduit
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Old 02-16-2018, 04:54 PM   #2
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I have never seen anyone get called for it but if you bundle for more than 2' then you have to derate. De-rating lots of wires is a huge issue. A few wires in a conduit is not o bad
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Old 02-16-2018, 05:54 PM   #3
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What is the problem with bundling wires like in zip ties in a panel. I've never I understood it because they're together in conduit
Very simple ., derating will nail it hard.

anything more than 2 feet or 60 Cm then you have to derate depending on the numbers of conductors you bundle it up.

If it was just couple I would not worry about it too much.

kinda like a judgement call depending on how you route it in the panel.
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Old 02-16-2018, 06:16 PM   #4
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I've heard of derating for long distances why would you need to for bundling
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Old 02-16-2018, 06:28 PM   #5
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I've heard of derating for long distances why would you need to for bundling
Even for short distance like 60 Cm make the differnce there.

The issue is thermal effect on bundling.

It mention pretty often in NEC code and CEC ( Canada Electrical code )

That one reason why I been carefull with bundling the conductors.
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Old 02-16-2018, 06:48 PM   #6
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What is the problem with bundling wires like in zip ties in a panel. I've never I understood it because they're together in conduit
Because it SUCKS, it complicates troubleshooting and the floor becomes littered with cut cable ties. A few cable ties with an eye screwed to the backbox that loosely holds the conductors is fine, beyond that it is just a PIA.
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Old 02-16-2018, 07:10 PM   #7
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Hate it when I see it. I’ve seen a previous installer do a nice job in a lighting contractor with about 12, 277 volt lighting circuits zipped tied together all nice and neat. 3 years later I got a trouble call to go back to the building because the main tripped to the building.
I then saw soot on the side of the contractor enclosure.
Long story short the contractor box blew up because over time the insulation deteriorated away Because the wires were tied together and shorted out.


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Old 02-16-2018, 07:32 PM   #8
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You don't need zip-ties to properly dress a panel, just experience.
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