Recent content by swz202

In Canadian Electrical Code it requires 600mm horizontal clearance between cable tray and wall (12-2200(6)), but in reality I've seen a lots installations that do not meet this requirement. Not sure what is the requirement in NEC, but I am wondering if anybody can explain if there are any other...

Try to answer your second question: First,CEC diagram B4-1 doesn't show 3 or 5, 7...paralell runs at all, it just shows different senarios of 1/2/4/6 paralell runs. Second, diagram B4-1 is intended to be used together with table D8A/B--D15A/B, to give you the maximum allowable conductor...

0.25 cycle = 0.00417 sec, isn't it?

Very helpful replies. Thanks you all.

For a 750kVA standby generator, which is more common? Liquid cooled or air cooled? Liquid cooled will cost more, but how much more? Thanks.

I'm going to spend a couple days there to do some site investigation and inspection. At this point I have little information about this plant. Thank you guys all for your helpful information.

I am presently working on the evaluation and cost estimation of upgrading a 40+ years old gas plant. Want to have some idea what is the normal life span of transformers, switchgears, motors, cables, etc. Thanks in advance.

oops...i totally missed the power requirement part. I agree with Skogsgurra's resistors + contactors + PLC solution.

Try Analog Devices, http://www.analog.com/ and search for "variable resistor"

Another thought on this issue, we'll use 1000 volts rating cables for this application. Following is from IEEE Red Book: The selection of the cable insulation (voltage) rating is made on the basis of the phase-to phase voltage of the system in which the cable is to be applied, whether the...

Got the idea. Thank you all.

We have a 600V ungrounded delta system. Is power cable with 600V insulation rating enough for this appilcation? My thought is, under a phase-ground fault condition, the other two conductors will subject to overvoltage.....

I'm reading Handbook of Practrical Electrical Design by J.F. McPartland & Brian J. Mc Partland. Page 445: Wye-Wye transformer connections should generally be avoided because of the objectionable characteristcis of such connections. First, a connection of this type generally requires that the...

Thanks, Jraef, Do you mean I can size the circuit breaker of soft starter circuit the same way as in full voltage starter?

Does anyone know of how to size the circuit breaker for VFD and soft starter circuit? The code does not mention anything about it. Normally VFD user manual will give the suggested circuit breaker size. But what about soft starter circuit?