Tried to find an “R” word for Crowding, but couldn’t.
Some help from an electrician, please.
What are the rules for bend radii on romex when you change direction (as in “up through the bottom plate, then through a stud”)
Also, what are the rules about the number of romex you can put through a single hole in a stud? I know it would vary with hole size, so does the inspector look for the ability for the cables to move freely? Or is it one/hole only?
Thanks in advance for any helpful replies.
Replies
336-16. ...[don't damage the cable]... and "the radius of the curve of the inner edge of any bend shall not be less than five times the diameter of the cable".
In typical Code fashion, it does not define the diameter of the cable which is ofter oval. In wire fill calculations, you would use the wide dimension but I will let you use the small dimension in this case. I'm nice.
As for the holes just make sure the cables fit. If the holes are less than 1 1/4" from the edge of the stud, protect with a metal plate.
Be aware that in the 2005 Code, if the hole is sealed with fire caulk [2 or more cables], the ampacity must be derated. Write your state legislator and tell them not to bother adopting the 2005 Code.
~Peter
Thanks - I've got some radii to increase. . .but luckily, no holes to enlarge. The holes are already protected with plates where necessary.