Declare machine with control cabinet as portable without main switch.

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janni1977

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E-Designer
Hi all,

I am an e-designer from Germany and not 100% familiar with UL508.
My question: May I declare a machine that can be transported with a forklift as portable?
I would waive the requirements for a main switch and install a suitable connection plug.

Thank you in advance for your answers!

Jana
 
There is no requirement in UL508a for a main switch.

There is a requirement for a disconnecting means. For portable equipment a plug is considered an adequate disconnecting means. Keep in mind it will probably need to be HP rated.
 
The space shuttle mobile gantry is a portable machine, isn't it? Or is it a vehicle?
 
petersonra said:
There is no requirement in UL508a for a main switch.

There is a requirement for a disconnecting means. For portable equipment a plug is considered an adequate disconnecting means. Keep in mind it will probably need to be HP rated.
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What he said.
Personally I have done complete rock crushing systems that were "portable" by virtue of dragging them around with tractors, they were all done with plug-in connectors (although they also had disconnect switches).

if the "machine" is more than a few HP, I don't like the idea of there being no disconnect, but that is not a rule other than my own. It can be really inconvenient to troubleshoot something if the only way to disconnect it is to unplug it. But that depends on the nature of the machine, and only you know what that is.
 
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