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

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

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

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    Depends on the type cable.. see 300.34
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

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    Quote Originally Posted by augie47 View Post
    Depends on the type cable.. see 300.34
    Wouldn't a standard 4" elbow comply with that section?
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

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    Quote Originally Posted by infinity View Post
    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".
    Don, Illinois
    (All code citations are 2017 unless otherwise noted)

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    Quote Originally Posted by don_resqcapt19 View Post
    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.
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

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    Now go look up how to size the pull boxes.

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    Quote Originally Posted by sameguy View Post
    Now go look up how to size the pull boxes.
    I'd also double check the 4" conduit size, and the jambing ratio.

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    4" EMT Long Radius elbows have a 24" radius
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

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    Quote Originally Posted by steve66 View Post
    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.

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

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