Terminal blocks field mounted in JB

[rpg]

If the electrical contractor installs terminal blocks within JB's inside an electrical room, do they have to have a field inspection for approval for UL50? This is an industrial waste treatment plant.

 

[don_resqcapt19]

UL 50 only covers the enclosure itself.
I see no need for any additional evaluation assuming that the terminal blocks are listed.

 

[infinity]

I agree with Don. Terminal strips are installed in junction boxes all of the time.

 

[Jraef]

Generally, the rule is 3 or more devices in an assembly, including the box. The terminal "strip" would be one device, the box is #2, so that's usually fine.

 

[tom baker]

But, the din rail terminal blocks are ul component recognized, not listed. There are listed terminal strips
But field install of terminal blocks is very common.

 

[rpg]

Thank you all for your feedback. Been having problems deciding what is applicable.

 

[tom baker]

You could have a panel shop fan up j boxes, terminal strips and apply a UL 508A label

 

[don_resqcapt19]

But, the din rail terminal blocks are ul component recognized, not listed. There are listed terminal strips
But field install of terminal blocks is very common.

Some are listed, but most are recognized....I just chose to ignore that issue when I assemble a terminal box

 

[Jraef]

But, the din rail terminal blocks are ul component recognized, not listed. There are listed terminal strips
But field install of terminal blocks is very common.

True, but the OP never said they were DIN rail terminals.

And even if, would an AHJ consider 4 terminals, the rail and 2 end blocks to be 7 devices, or one “terminal strip”?

 

[SceneryDriver]

Some are listed, but most are recognized....I just chose to ignore that issue when I assemble a terminal box

And strangely, the terminal blocks behave exactly the same, whether or not their installation has been ble$$ed by the high priests at UL.


SceneryDriver