drilling bell boxes

[TwinCitySparky]

Interesting that the round bell box comes with molded mounting tabs.

 

[aftershock]

Why does a round FS box have 6 threaded openings but only comes with 3 threaded KO fillers?

 

[alfiesauce]

the ones I use have 5 kos and come with 4 fillers.

 

[e57]

Is that similar to that black adhesive foam gasket that sometimes comes with wallpacks? Where are you getting the bituthane sheets?

No- this is simular to - or may even be the same type material as the 3M splicing mastic. But a thinner more uniform sheet - typically it is used around windows under the flashing. You can get it in huge rolls, or narrow strips - and it may be quite pricy.... The last time I had to use it, it was all provided for me by the GC. My current and last project have a real tweak for a water-proofing engineer - over-kill IMO, but hey....

 

[LarryFine]

I prefer the PVC bell-boxes. They come with four mounting tabs molded as part of the box, the KO's are closed off until you open the ones you need, and no bonding.

I do drill two 1/8" drain holes in the bottom side of just about every "water-proof" box I mount outdoors, as well as the bottom side of LB's and other such fittings.

 

[jrannis]

OK, I have been using the taps ever since I recieved a rejection for putting a tapcon and fender washer through the back center knock out.
Its a rare occasion for me to use a cast Bell Box now that PVC FS boxes are around

 

[jeremysterling]

I do drill two 1/8" drain holes in the bottom side of just about every "water-proof" box I mount outdoors, as well as the bottom side of LB's and other such fittings.

If the holes I drill are 1/8" or less, they are "weep holes. " I drill 3/16" for a "drain hole".:roll::grin:

 

[realolman]

If the holes I drill are 1/8" or less, they are "weep holes. " I drill 3/16" for a "drain hole".:roll::grin:

I think 3/16" is a "wasp" hole:smile:

 

[glene77is]

dezwitinc wrote:
"From the 2007 White Book:"

Very good response.

We should be very careful & thoughtful when doing field-engineering.

Drilling holes in boxes and cross-installing circuit breakers are common things.

I wonder what other activities are not such a 'sure fix'
and more obviously come under White Book cautionary flags ?

I recall 'fixing' aluminum connections with axle grease from our truck
(that was at Smith&Keene, Virginia Beach, VA, 1959).

Perhaps this calls for a new topic?
"Fixing Aluminum Wiring" is one of my favorite subjects,
since I have lived with and fixed a bunch of it.

...

 

[iwire]

We should be very careful & thoughtful when doing field-engineering.

I agree, we should also use common sense. :smile:

Drilling holes in boxes and cross-installing circuit breakers are common things.

Drilling holes in boxes is almost always OK.

'Cross-installing circuit breakers' is almost always a direct violation of the panels labeling.

 

[steelersman]

I think 3/16" is a "wasp" hole:smile:

you got that right!

 

[480sparky]

OK, I have been using the taps ever since I recieved a rejection for putting a tapcon and fender washer through the back center knock out.....

Did you receieve a code reference with that as well?

I recall one manufacturer that makes a mounting system specifically for the KO. Arlington, I believe.

 

[benaround]

On the instalation instructions with a 'bell' box it says install tabs with screws provided,

on the next line it says ' install box firmly to surface'.

It never mentions the 2 dimples inside the box, and it does not say to drill the box.

It does say to use 'silicon' for the threaded openings to seal agianst water penatrating.

Personally, I like to secure them firmly to the surface.

 

[480sparky]

Here we go: Arlingtons' Bell box holder:

 

[LarryFine]

Here we go: Arlingtons' Bell box holder:

I wonder if you could pass that through a KO and put on a lcoknut?

 

[480sparky]

I wonder if you could pass that through a KO and put on a lcoknut?

Kinda looks that way, given the last sentence in the "Other uses" at the bottom. :wink: