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Thanks Kiribanda. The 5kV cables are not shielded. I should clarify. My question is more to do with the cable tray itself. Canadian Electrical Code allows for cable tray to be un-bonded to ground as long as all cables are armoured and there is signage. I don’t feel comfortable with this at...

Hello, I am intending on using aluminum cable tray for a 5kV system as my bonding conductor, which is allowed per Canadian Electrical Code. Reading through section 36, I do not see anywhere that dictates otherwise (at least not clearly). All cables are teck with separate bonding conductors. And...

Agree, and I intend to make them aware of the risks. From their point of view though, if the previous installations have been providing what is required without issue, they do not see a point in spending more $. Tough to argue. I have been involved in many projects for Oil and Gas facilities...

There are a variety of motors with various distances. Closest motor is probably 10 meters and everything goes up from there. No conduits being used.

Hello, I am dealing with an expansion to an existing facility where VFD controlled motors in a washdown area have been fed powered with SOOW cables from JBs mounted at ceiling level. The service and motors are 600vac. We were planning to replicate the existing installations, but I am concerned...

Odd setup I agree. Unfortunately it's what we were given to work with. I see what you mean about the + and - DC bus and ground referencing, but as long as the system is not intentionally grounded anywhere beyond the transformer, there should not be any alternate return paths and therefor no...

If the VFD was wired with two ungrounded conductors as the supply, I would agree, but in this case, one of the supply conductors is the grounded conductor because the transformer is single phase 480vac with one leg grounded. The grounded conductor supplies L2 of the VFD while the ungrounded...

Hello, I have come across a situation where available power on site is from a single phase 480VAC transformer with one leg grounded. There are a couple VFD loads requiring 480VAC 3-phase power. Separate single phase VFDs were purchased and de-rated to account for the additional current...

I have a situation where we have two 1.2MW Generators feeding a 5600A bus in parallel. The generator breakers are MDS 520 and have been specified as 2000AT/2000AF. I had a senior engineer go through the single line and he was concerned that having a 2000AT trip unit installed in the 2000AF...