Good morning. I think NEC is silent regarding clearance requirements from bus to the enclosure. The same standard would apply to bolted connections. In other words, a compression lug is terminated to the gear. Bolt is facing outward. Is there a required distance from the bolt to the cover? Thank you for the help.
Space from bus to enclosure
- Thread starter fatuus
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petersonra
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- Northern illinois
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- Semi-retired engineer
I don't know if the NEC has any requirements but ul508a does
Does it give a number?
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- New Jersey
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- Journeyman Electrician (retired)
Does NEC 408.56 apply?
petersonra
Senior Member
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- Northern illinois
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- Semi-retired engineer
It gives a bunch of numbers depending on the situation. Take a look at tables 10.1, 10.1A, and 10.2.
petersonra
Senior Member
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- Northern illinois
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- Semi-retired engineer
seems to be in the construction specifications section, so would not seem to apply to field work.
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- Illinois
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- retired electrician
While it probably does not apply to field work, the electrons do not care who installed the conductive parts. If those spacings are safe for the construction of the panelboard, they should also be safe for field installed conductive parts.
petersonra
Senior Member
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- Northern illinois
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- Semi-retired engineer
The numbers certainly seem more than adequate.
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