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What type of switch is required for an incoming service of 3000-4000A?

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    What type of switch is required for an incoming service of 3000-4000A?

    I guessed (incorrectly) that the answer was a "metal enclosed isolation switch," and my rationale was mostly centered around the isolation aspect. Does anyone know of any sources I can read that can help clarify this? I'm guessing the correct answer was "bolted pressure switch" but I'm not sure why that's any more correct than the answer I gave, although I figure it's got something to do with the high current associated with the incoming service.

    Thanks!

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    Quote Originally Posted by IncredibleGreg View Post
    I guessed (incorrectly) that the answer was a "metal enclosed isolation switch," and my rationale was mostly centered around the isolation aspect. Does anyone know of any sources I can read that can help clarify this? I'm guessing the correct answer was "bolted pressure switch" but I'm not sure why that's any more correct than the answer I gave, although I figure it's got something to do with the high current associated with the incoming service.

    Thanks!
    Metal Enclosed Interrupter Switch. That's what I've seen at facilities.

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    Quote Originally Posted by IncredibleGreg View Post
    I guessed (incorrectly) that the answer was a "metal enclosed isolation switch," and my rationale was mostly centered around the isolation aspect. Does anyone know of any sources I can read that can help clarify this? I'm guessing the correct answer was "bolted pressure switch" but I'm not sure why that's any more correct than the answer I gave, although I figure it's got something to do with the high current associated with the incoming service.

    Thanks!
    They are somewhat different in construction. Bolted one sort of acts like a bus and gives better reliability in a long run. That's why it's used for higher ratings

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    Quote Originally Posted by akumar View Post
    Metal Enclosed Interrupter Switch. That's what I've seen at facilities.
    I forgot to add: In Medium Voltage service equipment, these are Metal-Enclosed Interrupter.

    3000 - 4000 Amps has to be Low Voltage. So - Bolted Pressure Switch is the choice.

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    Jrmcritical is offline
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    The answer would definitely be bolted pressure switch as its one of the few switches that can handle a high ampacity and be built to withstand a 200kAIC fault current.

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