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.
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...
