Todays graphic of the day 75% splice fill

[Jpflex]

IF splices are made in a wire way it must not fill more than 75% of that space.

Does this include calculating wire nuts area? How would this be done? We are speaking of a square length x height measurement but not a cubic volume measure l x h x w correct?

 

[don_resqcapt19]

It is pretty much physically impossible to exceed the 75%.

 

[infinity]

Like Don said the 75% rule is virtually impossible to exceed and virtually impossible to accurately calculate.

 

[LarryFine]

Does this include calculating wire nuts area?

Yes.

How would this be done?

Best guess.

We are speaking of a square length x height measurement but not a cubic volume measure l x h x w correct?

Correct.

 

[Joe.B]

Easy, calculate the empty volume, then see how much water it can hold. It's science dude, what could go wrong?

 

[acrwc10]

Easy, calculate the empty volume, then see how much water it can hold. It's science dude, what could go wrong?

make sure the circuits are energized and "seal all unused openings" first.

 

[Jpflex]

Like Don said the 75% rule is virtually impossible to exceed and virtually impossible to accurately calculate.

I would not think its near impossible to fill 75% because wire nuts and splice polaris can be large.

I agree that wire nuts do not have typical l x h dimrntions, which makes calculating area difficult. Would this calculation likely be on state test?

 

[infinity]

I would not think its near impossible to fill 75% because wire nuts and splice polaris can be large.

The interstices around the conductors and splices wouldn't allow you to get near 75% fill.

 

[LarryFine]

I would not think its near impossible to fill 75% because wire nuts and splice polaris can be large.

But they would have to be stacked like Tetris pieces to eliminate the spaces.

 

[Jpflex]

But they would have to be stacked like Tetris pieces to eliminate the spaces.

Prerhaps but im assuming this calculation wont be on the journeymans test?

 

[LarryFine]

Prerhaps but im assuming this calculation wont be on the journeymans test?

Nothing beyond the fill percentage figures.

 

[kwired]

Easy, calculate the empty volume, then see how much water it can hold. It's science dude, what could go wrong?

If not joking, the fill in question the fill at any particular cross section kind of like how raceway fill works and not a volume fill like it is for a junction box.

You can't jam 3/4 of the left side of a horizontal wireway to 100 % fill and leave the right 1/4 totally empty and still be in compliance.

A wireway is essentially a raceway but can have things other than just conductors installed within it, with some limitations of what those things possibly might be.