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I've always wondered this as well. I have seen some panels with 60+ circuit breakers. It just seems that if a knockout was punched for every CB, the box might not be structurally sound anymore.

Thanks dpc. I just need ballpark numbers.

I normally would, but I'm in a very austere location and don't have an easy means contacting vendors. As for the enclosure, it can be IP equivalent. Just as long as it's rated for outdoor use.

Whoops!! This is a distribution transformer but I made a typo. It should be a 630kVA and not 6030kVA[surprise]. So I'm calculating 877A on the low side.

I believe I posted this in the wrong forum previously. I've been trying to get cost estimates for a transformer. Specifications for the transformer are as follows: outdoor rated (NEMA appropriate enclosure), 630kVA, 50Hz, 11kV(delta)-415V/240V(wye), pad-mounted, oil-filled. Shipping or...

Does anybody have a good source to determine the cost to purchase a 6030kVA/11kV-415V/50Hz, outdoor rated transformer? I don't have access to my RS means. Thanks in advance.

I was afraid to ask as well. The load has protection but based on what I'm seeing, that means the cables from the high side of the XFMR back to the switchgear at the power plant has none. I'm having the contractor get the configuration of the transformer. We can't measure the voltage at the...

That would mean that the transformer is expecting a wye voltage on the high side. But there are only 3 cables on the input side of the transformer. Does that mean that not connecting the neutral to the high/wye side of the transformer has no affect?

The reasoning I would think that you anchor the transformers down is because of minor vibrations, such as those caused by big rig trucks, trains, or airplanes. I don't think that any one of those on its own would cause the transformer to vibrate off the pad, but over time you could find...

I am working on a project to expand the electrical distribution from a power plant to add a feeder for some loads. I went to the existing electrical distribution to determine configurations and voltages. What I observed on the nameplate of the transformer was something I haven't come across...

I've recently taken over a position for someone who has left. We are required to do random inspections on electrial panels installed and maintained by a contractor. I've been reading through past reports and saw a discrepancy that was noted for a particular panel. It stated that unlocked...

Thanks for the help 7anoter4. Where did you get the thermal resistance for XLPE? Also do you know where to find the temperature rating for XLPE? Thanks.

These particular cables will be feeding mostly linear loads. Not very much 3rd, 6th, etc.. or higher harmonics. There is supposed to be 2 battery chargers for forklifts when the building is built, but the biggest impact load are motors for some water pumps.

First of all, thanks for the help. I was thinking the same thing since even though the neutral is treated as a current carrying conductor there shouldn't be much current on the neutral to make much of a difference in regards to temperature considerations. I wouldn't be surprised if it isn't UL...

We have a contractor submitting a cable that he is requesting our approval on. The load is rated for 300A so he submitted submitted a 300mm^2 (1 run, all phases and neutral in one cable). The voltage is 380V. This cable is to be buried directly in earth and concrete-encased in a electrical...

This system is definitely not designed for that. It's supposed to just provide three different phases of 240V to ground via a wye connection with the neutral tied to ground. Very simple system. The transformer was put there as a means to reduce the amount of copper needed to make a very long run.

Hmmm, interesting because the neutral is grounded. And I'm almost sure that we checked from A to neutral and B to neutral as well. I will double tap though and verify that. It's just a really long story on why it is such a cumbersome task to gain access to this small transformer. Thanks for...

We tested a small, 3-phase, dry type, 20kVA transformer that is delta to wye and 1000V/416/240V. We took a multimeter and measured from from Phase A to ground and phase B to ground on the low side and measured 416V. When we measured from phase C to ground we measured 0V. This told me that...

Man I love this forum. You guys are full of great information. That military handbook has great information. To add some more details about the project, the camp is supposed to be powered by the grid. But the grid is so unreliable they are planning to run on prime power most of the time. So...

I think that's what we may wind up doing that. What we're going to do is force the contractor to tell us exactly how he plans to do the load calculations. It makes sense to me that they shouldn't be trying to use the diversity factor to downsize the generator but should be trying to oversize them.