I've looked through the NEC but I can't seem to find anything that points to the allowable fill for outdoor precast cable trench. Does anyone know the applicable guide/section for this?
I've been searching for what the line-ground clearance for a transmission type structure within a substation fence over a drive path. I am having a difficult time finding a specific rule. We are using a transmission-type structure with phase-over-phase (lines attach vertically) attaching to an...
I had the opportunity to watch a 230 kV line switch closing to tie the 230 kV line to the new substation that was built for a 230 / 13 kV substation which was energized. I noticed that when the switch was closed, there was arcing as the switch was being closed. Is this arcing normal or is...
I have a bushing current transformer on a transmission circuit breaker. If I short the current transformer and ground it, does current still flow through the closed loop?
I am trying to learn about relaying and on one high-impedance bus differential scheme I noticed it utilizes current elements in the CT circuit. What is the purpose of this? I think one purpose is to detect breaker failure in the event one breaker fails to trip but what are the other uses?
I am looking for a 3Ø 208VAC cabinet with a single 400A breaker that will need an auxiliary contact for the state of the breaker and will need to be NEMA 3R or 4. Has anyone used anything similar? I do not know what to look for as far as manufacturers and breaker types. Also, I have never...
Does anyone know of an article that explains exactly why aluminum and copper fittings should not be connected together and why bronze should be used to connect aluminum to copper?
I am looking for manufacturers of non-metallic fencing to be installed in a power substation around a Static Var Compensator (SVC). I have already received a quote from one and need another. Here is the one I found:
www.amico-securityproducts.com/non-conductive-fence.htm
Anyone know of another?
