bluecollar84
Senior Member
- Location
- US
What's the new rule on de-rating network cables that are bundled? Cables such as cat5e and cat6
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De-rating network cables
- Thread starter bluecollar84
- Start date
- Status
zbang
Senior Member
- Location
- Roughly 5346 miles from Earls Court
Haven't heard of any such rule. From where? Derating network cables doesn't make sense, they don't carry more than milliwatts.
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
Actually PoE network cables can carry up to 25 watts (PoE+).
luckylerado
Senior Member
- Location
- Lake of the Ozarks
No derating rule that I have ever heard of but there are raceway fill and bend radius rules. Cat6 should not be bundled due to cross talk concern at the higher frequencies. Just let it lay wild.
texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
The new rule is 725.144 and is a response to concern raised by a UL study that data cables that are also used as POE may over heat. Bundling of ethernet cables that are not also being used for POE is not an issue.
texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
Yep, and soon to be higher. I think with the next standard of 802.3bt they are talking of up to a hundred watts. Imagine a bundle of 200 or so with this kind of power on them. Kind of scary.
Fulthrotl
~Autocorrect is My Worst Enema.~
- Occupation
- E
ohoh. more magic smoke escaping.
they will have to be plenum rated so they don't smell when
they catch fire......
zbang
Senior Member
- Location
- Roughly 5346 miles from Earls Court
True, was not mentioned by the OP.
bluecollar84
Senior Member
- Location
- US
I meant POE data cables bundled what's the rules ?
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texie
Senior Member
- Location
- Fort Collins, Colorado
- Occupation
- Electrician, Contractor, Inspector
As already mentioned, see 725.144 in the 2017 NEC.
- Status