Transfer Switches Voltage Class

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FaradayFF

Senior Member
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California
Greetings,
I see that manual transfer switches are rated at 600Volts nominal per vendor catalog pages. Does that mean the the switch enclosure is rated for this voltage level to accommodate any breaker volts up to 600V.
What about the scenario where the molded case breakers are rated 240V to match system voltage?
Could someone clarify this for me?
Thanks,
EE
 
600V is common. The sizing of the beakers depends not on the ratings of the panelboard they are installed in but the voltages actually present. Your average 120/240V panel is actually rated for 2000 volts or something like that.
 
FaradayFF said:
Greetings,
I see that manual transfer switches are rated at 600Volts nominal per vendor catalog pages. Does that mean the the switch enclosure is rated for this voltage level to accommodate any breaker volts up to 600V.
What about the scenario where the molded case breakers are rated 240V to match system voltage?
Could someone clarify this for me?
Thanks,
EE
Click to expand...
Any time you see a voltage rating on gear, that is MAXIMUM. So anything rated for 600V is good for voltages of 600V and below.

If it were rated for 300V, you could not use it on 480 and 600V.
 
rnatalie said:
Nope. The panel/enclosure is rated that high overall, even though it's only listed for 120/240 breakers.
Click to expand...
No, that's not true, unless maybe you are thinking of the IMPULSE level of the bus insulation. 2000V would require phase-to-phase and phase-to-ground spacings that no LV panel would provide. You can't say that without risking getting someone in trouble.
 
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