Bonding Bushings on eccentric KO's

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hacim23 said:
this question just came up on my job so I searched and found this thread.

So over 250v with eccentric requires a bond bushing right?

my example is a 480v, 30a service disconnect feeding an exhaust fan.
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hacim23 said:
this question just came up on my job so I searched and found this thread.

So over 250v with eccentric requires a bond bushing right?

my example is a 480v, 30a service disconnect feeding an exhaust fan.
Click to expand...

Yes, disconnect switches with concentric or eccentric KO's are not listed like most boxes are.
 
infinity said:
Yes, disconnect switches with concentric or eccentric KO's are not listed like most boxes are.
Click to expand...

Both concentric and eccentric KO's remaining require bonding bushings, when the system is >250V to ground nominal, unless otherwise listed for bonding at the higher voltages. Or other substantial bonding means to bypass the path through the knockout rings, such as bonding hubs with jumpers or bonding locknuts with jumpers
 
Carultch said:
Both concentric and eccentric KO's remaining require bonding bushings, when the system is >250V to ground nominal, unless otherwise listed for bonding at the higher voltages. Or other substantial bonding means to bypass the path through the knockout rings, such as bonding hubs with jumpers or bonding locknuts with jumpers
Click to expand...


That's pretty much what I said no? Most boxes are listed for bonding over 250 volts, disconnect switches aren't.
 
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