Conduit drainage

[Zee]

If conduit from roof runs down exterior, bends 90 and 90 again (total horizontal run about 3') and into a box......do I need drainage in the conduit (T or LB) itself at the low point ............ or do weepholes in the box suffice?

BTW - this is the latest fave correction of inspectors. For good reason too.

 

[Strathead]

If conduit from roof runs down exterior, bends 90 and 90 again (total horizontal run about 3') and into a box......do I need drainage in the conduit (T or LB) itself at the low point ............ or do weepholes in the box suffice?

BTW - this is the latest fave correction of inspectors. For good reason too.

IMO, the actual low point needs drainage. if that low point is in a box then weepholes in the box, if it is on the conduit the weepholes in the conduit.

 

[infinity]

Depends on the type of raceway. EMT will self drain through the terrible wet location fittings. RMC will drain through the couplings. For PVC drill a hole at the lowest point of the run if that isn't in a box.

 

[ptonsparky]

Weep holes in boxes or conduit bodies. I used to cut the gaskets at the low points. I’ve yet to figure out why a bell box designed for wet locations will allow water in via gaskets but not out.

 

[infinity]

Weep holes in boxes or conduit bodies. I used to cut the gaskets at the low points. I’ve yet to figure out why a bell box designed for wet locations will allow water in via gaskets but not out.

I do the same thing cut a notch in the bottom of the gasket around the bottom screw. It's amazing to see the boxes without the notch filled with water.

 

[jaggedben]

If conduit from roof runs down exterior, bends 90 and 90 again (total horizontal run about 3') and into a box......do I need drainage in the conduit (T or LB) itself at the low point

Well, yes, you do. Don't ask me about my experience with this.

............ or do weepholes in the box suffice?

Not if the conduit would fill with water below the box, no.

EMT will self drain through the terrible wet location fittings. RMC will drain through the couplings. ...

Not if the two 90s are bent with no coupling.