Radius of 4in of EMT 90 for 10 K volts thee 500 mcm

[jbolen]

What size 90 degree radius is required for 10,000 volts for thee 500 in 4 in emt

 

[augie47]

Depends on the type cable.. see 300.34

 

[infinity]

Depends on the type cable.. see 300.34

Wouldn't a standard 4" elbow comply with that section?

 

[don_resqcapt19]

Wouldn't a standard 4" elbow comply with that section?

A standard radius bend for 4" is only 16". The first 500kcmil, shielded cable I found in a quick search has an OD of 1.570. 300.34 gives the minimum bend radius for shielded conductors as 12 times the diameter, requiring a minimum radius of 18.84".

 

[infinity]

A standard radius bend for 4" is only 16". The first 500kcmil, shielded cable I found in a quick search has an OD of 1.570. 300.34 gives the minimum bend radius for shielded conductors as 12 times the diameter, requiring a minimum radius of 18.84".

Good to know.

 

[sameguy]

Now go look up how to size the pull boxes.

 

[steve66]

Now go look up how to size the pull boxes.

I'd also double check the 4" conduit size, and the jambing ratio.

 

[augie47]

4" EMT Long Radius elbows have a 24" radius

 

[mkgrady]

I'd also double check the 4" conduit size, and the jambing ratio.

Consider 5” conduit. The wires can’t jam in 5”. Jamming can be a nightmare.

 

[sameguy]

5" could take new tooling if he doesn't have them.