Recent content by HighPotter

On new installations of cable, our utility still requires a DC hi pot "proof" test, to what ever voltage the chart says. Our primary cable is EPR. This engineer wanted us to " meg " the cable, using a our Biddle 15kv meggar. I disagreed. I was looking for opinions on why he might want the...

Thats my point, wareagle. I was told by an engineer to Megg a new installation of cable. I just dont understand what he was looking for from this sort of test. I have always DC highpotted a new cable installation, to most of the time, ATLEAST twice the rating of the cable. HP

The word is " shielded"..I am sorry. Long day. HP

What REALLY would this prove? This is shieled, jacketed 15kv cable, 3 conductors per conduit. The "run" is approx. 1000' long, with pole top terminations at each end. HP

What type? What size? What sort of material? Ya got to give us something. HP

And it is square, hollow, copper tubular bus.

thanks everyone. Wow, Waross, those links are great. I'll check them all out. I can't see how just soldering this bus would be sufficient. But since you say the solder is actually stronger then the copper, I guess Im wrong. I am partial to a bolt together system, if rated properly...

We have some 3000amp rated, tubular copper bus work. Any suggestion on a good way to cut out a ssection, then put it back in? A splice you might say, between tubular, 3"square x 1/4" thick copper bus. Can copper bus be "welded" ? If so, what would be the best way? Or should "splice plates" be...

Well first off, which utility? I have experience with most of them. HP

When the batteries are only 3 years old, and its your ONLY bank, then strap and spG reading are the extent of testing. HP

The AC dip was for slightly more then 50 cycles. The DC dip was only for 10 cycles. The bank was just recently tested and all was good. It was not however discharge tested or load tested. Have any of you heard of the term " Coup De Fouet " HP

We have a bank of lead acid batteries providing substation dc power. Recently, during an event, we had a dip in our station power, which of course caused a dip on the input voltage to the charger. At the exact same time the station power dipped, our DC voltage dipped from 134v to 78v, but for...

Thank you Ron, I will check those out. HP

I am being asked to calculate, then mark(identify) 4 different locations, on a customers electrical infrastructure. Very simple installation. Small 3 phase service provided by the power company, then feeding several loads thruout the companies property. Is there software/info available where...

Thanks for your responses. In this case, the Troubleman marked the rotation prior to deenergizing the service, and then a different meter was used when checking before renergizing. Next time, the same meter will be used, regardless. HP