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

[IncredibleGreg]

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!

[akumar]

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.

[CQCmaster]

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

[akumar]

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.

[Jrmcritical]

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.