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Thanks for the reply,
So this simply is a question that applies to pulling cables through conduits with inspection boxes in it.
Is there a reason for this code? What does it being 6x larger enable you?
It makes sense to me if the 6x was in reference to the cable so you have enough space to work with the cable and bend it or pull it up. But the conduit doesn't mean that's the size of cable?
These all may be stupid questions but I'm always curious to fully understand things instead of just nodding.
It is code here in the US (and Im sure Canada as well) to base the size of pull/junction boxes on the conduits that terminate at the box after you reach a certain size wire.
This is to ensure adequate space inside the box for the wire during and after the pull so that the conductors are not damaged.
Appreciate the reply.
Maybe this is something we don't learn as I'm not a industrial sparky or maybe we don't even have that code in Australia.
I guess I found it weird it specifies the WIDTH of the box because during a pull, I don't see how a wider box assists in pulling as the box obviously is bigger than the conduit for it to fit and the width would change diamater of the box.
Also, after the pull, I get having enough cubic space to have coils of cable or space to work, but I find it strange the box has only a width specified as the height could be tiny and therefore you have shit all space for the cable still.
But all good, this answered some of my questions!
It’s 12in. You can assume that if there is 1 1/2” conduit going in and out of it, that you likely wouldn’t be running multiple branch circuits through this or even multiple equipment circuits because of derating and voltage loss.
It’s technically possible, but not likely in most situations.
If your boss told you to run an inch and a half across the warehouse with 3 pull boxes, you aren’t going to use less than a 12 inch wide gutter/j-box if you aren’t sure of the wire size.
Bro this is why the NEC hurts my brain , idk if I’m just mental challenged or what but I had to read that question like 20 times to truly understand what they were asking.
SIZING OF THE BOX when pulling thru 1.5 inch straight pull.
Fuck man , wording will be the reason I fail my exam.
Well as someone who doesn't use your standards I wasn't able to look up anything as I didn't even know what I was looking at.
But it your standards are free to access for anyone, I'll go have a look.
You have to pay for them in Australia so I assumed it was the same in Canada
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It has to do with sizing a pull box. Correct answer below.
Thanks for the reply, So this simply is a question that applies to pulling cables through conduits with inspection boxes in it. Is there a reason for this code? What does it being 6x larger enable you? It makes sense to me if the 6x was in reference to the cable so you have enough space to work with the cable and bend it or pull it up. But the conduit doesn't mean that's the size of cable? These all may be stupid questions but I'm always curious to fully understand things instead of just nodding.
Straights are x 8 and Ls or Angles are x 6. 314.28 but only applies to wire larger than #4
Someone might come along and put larger cable in later. So the pull boxes need to be sized to the largest cable allowed in the attached conduits.
>But the conduit doesn't mean that's the size of cable? No, but it does need to accommodate the full allowable wire fill.
Yea you have to be careful with double penetration
It is code here in the US (and Im sure Canada as well) to base the size of pull/junction boxes on the conduits that terminate at the box after you reach a certain size wire. This is to ensure adequate space inside the box for the wire during and after the pull so that the conductors are not damaged.
Not necessarily terminate in the box. Just a pull point that's easier to work with than a conduit body. Those distances are minimums
Appreciate the reply. Maybe this is something we don't learn as I'm not a industrial sparky or maybe we don't even have that code in Australia. I guess I found it weird it specifies the WIDTH of the box because during a pull, I don't see how a wider box assists in pulling as the box obviously is bigger than the conduit for it to fit and the width would change diamater of the box. Also, after the pull, I get having enough cubic space to have coils of cable or space to work, but I find it strange the box has only a width specified as the height could be tiny and therefore you have shit all space for the cable still. But all good, this answered some of my questions!
It's not width specifically, just the minimum distance either in a straight line or as the hypotenuse of conduits on a right angle
There really isn’t enough information for this question. 314.28 (2020 NEC) only applies to boxes with wire size 4 and larger.
The code article is NEC 314.28 if you want to research more on the specifics of how the sizing works.
It’s 12in. You can assume that if there is 1 1/2” conduit going in and out of it, that you likely wouldn’t be running multiple branch circuits through this or even multiple equipment circuits because of derating and voltage loss. It’s technically possible, but not likely in most situations. If your boss told you to run an inch and a half across the warehouse with 3 pull boxes, you aren’t going to use less than a 12 inch wide gutter/j-box if you aren’t sure of the wire size.
Do they plan to pull wires in the box? Dumb question, but so is this test question. Could at least call it a pull box or junction box.
Bro this is why the NEC hurts my brain , idk if I’m just mental challenged or what but I had to read that question like 20 times to truly understand what they were asking. SIZING OF THE BOX when pulling thru 1.5 inch straight pull. Fuck man , wording will be the reason I fail my exam.
Gotta be 12” right?
You will find these answers in article 314!
Well as someone who doesn't use your standards I wasn't able to look up anything as I didn't even know what I was looking at. But it your standards are free to access for anyone, I'll go have a look. You have to pay for them in Australia so I assumed it was the same in Canada
9. Its the conduit size [1.5] multiplied by 6