Conduit Bodies Fill Calculations

[Jsim4109]

We have an installation in an existing 2" Fiberglass conduit, using (12) 4Awg XHHW and (4) 8awg XHHW. The installation has an LB fitting. 314.16deals with 6Awg and smaller while 314.28 deals with 4Awg and larger. How do you calculate an LB fitting taht contains both?

 

[Dennis Alwon]

I believe the LB's have a cu.in or a max wire size. A 2" LB says something like 4- 3/0 conductors-- I would calculate that and make sure my fill is no different

 

[infinity]

Once you get to #4 and larger conductors you need to size the conduit body by using the 6X and 8X rules for pull boxes. The amount of fill is based on the conduit connected to it.

 

[chris kennedy]

A 2" LB says something like 4- 3/0 conductors--

Never seen one that said 4. Can't use them on 3Ø wye's. In fact I just had an install to a delta primary tranny. 3 500's in 3" EMT. Ordered 3" LB, only good for 3 300's. :blink: Used wireway.

 

[Dennis Alwon]

Never seen one that said 4. Can't use them on 3Ø wye's. In fact I just had an install to a delta primary tranny. 3 500's in 3" EMT. Ordered 3" LB, only good for 3 300's. :blink: Used wireway.

I did say something like 4.... I was going from memory but mine sucks lately