Email
More
Hint: What's missing? It's not the fuse.
Feb 5, 2009 11:10 AM, By Joe Tedesco, NEC Columnist
Hint: What's missing? It's not the fuse.
Throughout Chapter 3 of the NEC, a Fine Print Note calls attention to 300.4(G) Insulated Fittings. This rule requires the use of insulated fittings when raceways containing ungrounded conductors 4 AWG or larger enter a cabinet, box enclosure, or raceway. A substantial fitting providing a smoothly rounded insulating surface usually provides the protection for the conductors, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place. Conduit bushings constructed wholly of insulating material can't be used to secure a fitting or raceway. The insulating fitting or material must have a temperature rating not less than the insulation temperature rating of the installed conductors. This cabinet violates that rule because the fitting at the bottom right is metal.
Sponsored by:
Back to Question | See Full List of Quizzes
Want to use this article? Click here for options!
© 2010 Penton Media, Inc.
Code Challenge
Code Quiz
Mar 11, 2010 12:45 PM, By Steven Owen
When installing outlet boxes for wall-mounted luminaires, when can you use No. 6 screws to secure the luminaire yoke to a plaster ring?...
More Code Quizzes
Acceptable Use Policy blog comments powered by Disqus
What's Wrong Here
Sponsored By:
advertisement
what's wrong here?
|
Whats Wrong Here?Mar 11, 2010 12:54 PM |
|
What's Wrong Here?Feb 18, 2010 5:04 PM |
|
What's Wrong Here?Feb 4, 2010 5:06 PM |
View all What's Wrong Here?
What's Wrong Here
Sponsored By:
