Terminal Box Wiring Coming Through Wall for Conduit

[h901]

hi

is there a steel terminal box that caters for wires coming from inside to outside, all the terminal boxes i've found don't have holes at the back. i was just wondering what would be the correct way to feed a wire through the wall into a terminal box (then through conduit to a camera outside) do i just drill a hole through the box?
hope it makes sense

thanks

 

[Andy78]

A 22mm bit is the standard tool for 20mm conduit. Slight wanderings of the drill bit will make putting 20mm tube through a 20mm hole a right pain.
As my bit boxes are currently in the house I just popped and did some measuring for you:
Galv box spout O/D - 25mm
Galv coupler O/D - 22mm
Brass bush O/D - 25mm (at widest)

Hope this helps

 

[h901]

A 22mm bit is the standard tool for 20mm conduit. Slight wanderings of the drill bit will make putting 20mm tube through a 20mm hole a right pain.
As my bit boxes are currently in the house I just popped and did some measuring for you:
Galv box spout O/D - 25mm
Galv coupler O/D - 22mm
Brass bush O/D - 25mm (at widest)

Hope this helps

You're a legend, I appreciate the help. Cheers

Based on the above would it be wise to get a 22mm long bit for the conduit and then a 25mm (or 26mm) to make space and the openings for the spouts?

 

[HandySparks]

Cheers

Oh ok, what drill do you use the diamond core drill bit with?

Marcrist Drilling Machine DDM1, Core Drill City - http://www.coredrillcity.co.uk/product_info.php?cPath=1_22_44&products_id=494

The higher of the two speeds suits the small bits.

 

[Andy78]

You're a legend, I appreciate the help. Cheers

Based on the above would it be wise to get a 22mm long bit for the conduit and then a 25mm (or 26mm) to make space and the openings for the spouts?

That's what I do, piloted with a 10mm to start. I like the idea of a small core drill though I must say.....

If you will be buying the 25mm just for the end couple of inches, you may find it cheaper just to get creative with a small chisel, unless you need a 25mm bit for the future.

 

[Andy78]

This should start you off cheaply ...... Long SDS bits usually cost about this much per each ...

Clarke CHT705 5 Piece 600mm SDS Drill Bit Set - Machine Mart - Machine Mart - https://www.machinemart.co.uk/p/clarke-cht705-5-piece-600mm-sds-drill-bit-set/

 

[h901]

Just resurrecting this thread as I have a similar question and thought it'd be better to do it this way instead of starting a new thread.

As suggested by others on here, I've been using the box with the rear spout and it's worked well. But I've got a job that needs around 10 wires all to enter the same point (each wire is 6mm). If I use the above method that would mean 5 boxes with rear spouts and for some reason it doesn't seem the right way. Any ideas or help is much appreciated. Thanks in advance

 

[freddo]

Use larger conduit, up to 2" conduit and fitting are available here. no rear spout boxes, so drill the back of a box and fit a bush and coupler. Though finding the conduit tools might be harder, I have a stock, dies and a bender that will do up to 2", but they are not common items any more.

View attachment 35753

 

[Midwest]

34 posts on how to drill a hole through a wall, should of looked at this thread;

Pete's Videos - How to drill a hole - http://www.electriciansforums.co.uk/threads/how-to-drill-a-hole.119540/

 

[h901]

Use larger conduit, up to 2" conduit and fitting are available here. no rear spout boxes, so drill the back of a box and fit a bush and coupler. Though finding the conduit tools might be harder, I have a stock, dies and a bender that will do up to 2", but they are not common items any more.

View attachment 35753

Wowza, nice set of kit. Thanks for your help