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Motor Control Center

Motor Control Center

Motor Control Center

(OP)
When you install motor control centers (buckets) do you still have to feed each 'bucket' with it's own breaker from another CB panel?

RE: Motor Control Center

No, the buckets come off of a vertical bus, which attach to a horizontal bus across the top. The service entrance to the mcc can either have a main c/b or switch or be main lugs only.  This depends on what is feeding it. Check your local/National El. code.

RE: Motor Control Center

Most MCC's I have seen have internal bus and the buckets have stabs that connect to it. Every bucket I know of has it's own breaker built in. No matter if it is a motor starter or AC drive such as General Electrics MCC's

RE: Motor Control Center

Generally speaking, NEMA Size 5 starter and smaller are connected via bus stabs, Size 6 and larger are cable connected to bus. MCC Buckets using MCP are HP sized.
MCC Buckets using Fuses are sized by HP range ie 20-50 hp.
You select branch circuit protection.    

RE: Motor Control Center

Comment: Some MCC compartments accept circuit breaker pannel (usually lighting and receptacles). One may potentially use these branch circuit breakers to protect other MCC compartments internal circuitry, in general. However, this appears to be very rare case; but it could prove to be a money and labor saver.

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