CT shorting using terminal blocks
CT shorting using terminal blocks
(OP)
When spare CT's are not used, what is the proper way to short and ground them?
1. Rely on the shorting screws in the shorting terminal block to short and ground.
2 In addition to the screws, add a jumper between the X1 and X5 terminal, thereby ensuring it is shorted even if one screw is removed.
3 In addition to the above, add another jumper between one of the terminals and ground, ensuring that if both screws are removed, it will still be grounded.
4. Something else?
Thanks in advance.
1. Rely on the shorting screws in the shorting terminal block to short and ground.
2 In addition to the screws, add a jumper between the X1 and X5 terminal, thereby ensuring it is shorted even if one screw is removed.
3 In addition to the above, add another jumper between one of the terminals and ground, ensuring that if both screws are removed, it will still be grounded.
4. Something else?
Thanks in advance.






RE: CT shorting using terminal blocks
RE: CT shorting using terminal blocks
RE: CT shorting using terminal blocks
But back to actual subject - For a truly unused CT, I'd take a belt and suspenders approach - use wire jumpers and the shorting screws.
RE: CT shorting using terminal blocks
RE: CT shorting using terminal blocks
Shorting with jumpers works fine. Shorting on a grounded shorting bar is better.
To me, shorting bars/screws are very reliable and the risks of a relay not performing due to only pulling one shorting method outways the very minimal gains of having 2 shorting methods.
Just my $0.02 worth.
RE: CT shorting using terminal blocks
We have been doing the belt and suspenders approach for shorting, but were looking at if we need a grounding jumper in addition to the grounding provided by the shorting screws.
David and Scott- it is interesting you both only want one method used, but it is the opposite one. I'll have to dig in some more and see if we have a consistent past practice here.
Do you use terminal block drawings that show the shorting screw locations?