CT Shorting Blocks Permanent vs Removable Screws

[yesterlectric]

I install what's specified on my jobs and sometimes it's what comes with the equipment. However, when dealing with single ratio CT's on a 3 phase system, are there ever shorting blocks that would have the common permanently shorted to the bridge such that only 1 temporary shorting screw per phase would need to be installed to bypass CT's?

 

[TwoBlocked]

I install what's specified on my jobs and sometimes it's what comes with the equipment. However, when dealing with single ratio CT's on a 3 phase system, are there ever shorting blocks that would have the common permanently shorted to the bridge such that only 1 temporary shorting screw per phase would need to be installed to bypass CT's?

That's what I recall seeing: one grounding screw per phase. Have also seen little knife switches on 240V CT's.

 

[TwoBlocked]

What I mean is the screws for the grounded legs are left in place. Only the hot leg screw was removed. At least that's what I remember...

 

[TwoBlocked]

 

[yesterlectric]

That's what I recall seeing: one grounding screw per phase. Have also seen little knife switches on 240V CT's.

The little knife switches you are speaking about are probably shorting test switches. THose are different. Usually 2 poles per CT because each pole has a different purpose. Here's a shortng block I see frequently. Marathon 1604SC. Do they make one with a permenant connection for the current neutral conductor to the bridge so that to short a particular phase, you'd only have to install one screw per phase?

 

[LarryFine]

I remember seeing little brass bars right on the CTs that rotate on a single screw in the middle.