Exterior Panels and how conductors enter

[BcSparky423]

Seems to me that most of the older homes with exterior fuse panels all have the branch circuit conductors entering the panel from the back. Alot of them have two or three 1 1/2" or 2" nipples w/ bushings and about 5 or 6 sets of cables entering the panel through them. So they are "bundled" together. I have heard this way of doing it is wrong of course although, i have changed out a panel and had about 5 to 6 sets coming through a couple of 2" pvc male adapters with bushings and passed inspection. But i did it that way before knowing it wasn't correct. Now that i know it's not the correct way, could someone explain the best way to bring conductors in through the back of panel? I have tried to research online and can't find much on this topic. If the clamp type connectors are the best way to do it, can they be "reversed" to where the clamp screws are in the inside of panel instead of behind it. Any info would help ive been licensed for only about a year and im still learning.

 

[LarryFine]

Welcome to the forum.

If your main concern is inspection, I would ask the inspector for what they deem suitable. I prefer cable clamps over nipples.

You can put the clamp inside the panel, but I put the clamp on the cables first, then set the panel over the clamp, and then put the locknut on the inside.

 

[brandonc0318]

Thanks for replying back, so my next question is, the main panel im installing has 3 concentric kos on the back of the panel. The smallest ko in all 3 is 1 1/2 " up to i believe 2 1/2". They take up most of the space where i would need to cut out for my new holes. Is it a code violation to cut out new smaller holes on top of those factory kos so i can get a few 3/4" clamps in place there and if it is ok its there any tips on the best way to cut them out?

 

[LarryFine]

Is it a code violation to cut out new smaller holes on top of those factory kos so i can get a few 3/4" clamps in place there and if it is ok its there any tips on the best way to cut them out?

Yes, it's okay to make your own holes. Make measurements and/or a template and use a hole saw.

Use gentle pressure so you don't mangle the metal, and maybe finish each hole from the other side.

If the hole locations don't work with thre panel, use a trough and nipple into the side of the panel.