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Question about using the removal of fuse holder only as an isolation

Question about using the removal of fuse holder only as an isolation

Question about using the removal of fuse holder only as an isolation

(OP)
Greetings all,
Is this sufficient as an isolation - pulling a fuse holder from the cutout? The policy at the company in which I work is that this is insufficient since there may be leakage on the cutout. We use a hotline connector when connecting cutouts - these are removed in addition to the fuse holders being pulled. What is your company's policy? If its not a problem, please mention the company you work for. Thanks from Trinidad and Tobago (state owned utility company).

RE: Question about using the removal of fuse holder only as an isolation

Might help if you mention the voltage level in question.

RE: Question about using the removal of fuse holder only as an isolation

(OP)
The voltage is at 12kV

RE: Question about using the removal of fuse holder only as an isolation

If there are transformers connected, they will have a low enough impedance to drop any leakage voltage on the line to zero. However leakage may be a danger on open (unloaded) lines. Why take a chance? Ground out before working on a line.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Question about using the removal of fuse holder only as an isolation

(OP)
Bill,
We do ground the lines, I am asking about the isolation only.

RE: Question about using the removal of fuse holder only as an isolation

Every utility I have ever worked with requires 2 isolation points.

RE: Question about using the removal of fuse holder only as an isolation

In Quebec, a single fuse cutout is enough but prior to grounding, the lineman will test for voltage to make sure there is no alternate voltage source like a customer generator. For us, a single open point is enough if it could be confirmed visually.

Daniel

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