Control panel disconnect

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DAWGS

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Location
Virginia
We are installing a control system for a pit sump pump. My question is the control panel that came with the system has breakers installed but no locking apparatus. Do I need to install a nonfused disconnect before the control panel? I am only concerned for the panel, the pumps will be cord and plug. The system is 480V 3-phase 7.5 amp. And no the feed breaker is not within sight. Thanks.
 
I never liked a breaker for a 480 v disconnect, you can't tell if the circuit is actually open. I've been bit by a breaker where 2 of the 3 phases opened....I know I should have checked the load side before beginning work..but being young and stupid I paid for with a painfull jolt. Verify test verify !!!!!!!!
 
barbeer said:
The control panel has no means to disconnect the feeders? If no, then I would think strongly of disconnecting it. What is the occupancy of the site?
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power plant. Turning the breakers off will disconnect the feeder power. Mains come in on a lug and distribute to three breakers.
 
What is the feeder protected by? For safety reasons alone, I would install a lockable disconnect right at the control panel. I would also check the feeder conductors and breaker to make sure they are the correct size.
If the panel was not built in your facility, check for the manufaturers label and verify the above recomendations.

Not installing a main disconnect with lock out provisions is just plain stupid. I am not saying you are stupid, but the designer and the builder are.
 
John Valdes said:
What is the feeder protected by? For safety reasons alone, I would install a lockable disconnect right at the control panel. I would also check the feeder conductors and breaker to make sure they are the correct size.
If the panel was not built in your facility, check for the manufaturers label and verify the above recomendations.

Not installing a main disconnect with lock out provisions is just plain stupid. I am not saying you are stupid, but the designer and the builder are.
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The feed breaker is 15A, we are pulling #10 THHN. The panel FLA is 7.5A. Actually I am finding out from my field guy that there is a means to lockout the control cabinet. So we will be OK.
 
I use qou breakers mounted on a din rail inside control panels.

Of late I have been adding the breaker lockout attachment. Gives them someplace to put a padlock if they want to work on the equipment.
 
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