480v starter with a 120 coil wiring

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benmin

Senior Member
Location
Maine
Occupation
Master Electrician
Have a 480V starter for a 10HP motor with a 120v coil. Is it compliant to run a 120v control feed from the 120/208 panel into the starter enclosure for the coil? Will have a remote switch controlling the starter.
 

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
It is much more common to get the control power from a control power transformer in the starter enclosure. That has an advantage in that you only have one power source that has to be locked out when you have to work on the starter.
 

templdl

Senior Member
Location
Wisconsin
Have a 480V starter for a 10HP motor with a 120v coil. Is it compliant to run a 120v control feed from the 120/208 panel into the starter enclosure for the coil? Will have a remote switch controlling the starter.

"Separate control" is commonly done. But, be mindful that when a CPT is used with a combination starter that you need to move the door handle to the open position which opens the fused disco or MCP in order to be able to have access to the enclosure.
Should you use separate control which to casn do you need to use a electrical interlock of the door hasnd where the intk opens the separate control circuit to disconnect the power for safety. It is possible to place a yellow causion label one the outside of the door stating that there is a separate source power should an electronic into not be used. You will also need to provide suitable OCP for the control circuit.
 

kwired

Electron manager
Location
NE Nebraska
When you have to interlock with other equipment or receive a run command with other equipment it gets more complicated as you can have more then one circuit in the motor control enclosure.

Kind of has become more standard practice though to use class 2 control circuits for such applications where multiple items are linked, interlocked, etc. that way you don't have as much issue with the need to disconnect a control circuit or multiple control circuits when accessing the controller enclosure.

Of course this also leads to the need or more careful separation of control wiring and power wiring then is necessary for class 1 control circuits.
 
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