Since i have limited information. I was thinking on the use of transformer here like is it for supply for other machines or its a seperate thing.

So can any body guide here, shall i give seperate 380v 3 phase supply to primary of 100kva load and seperate for other machines or should the load for machines be given by transformer.

The supply for production area will come from main distribution panel connected to 13kv/380v system.

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Is this adder added to my ambient temperature 86 f or is the adder added to the wire type rating 60 , 75 , 90

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Thanks, ]]>

I was reviewing my code book and got to thinking about duplex service conductors and I did my own practice load calcs and here is what I came up with.

1.Unit A & B each calculated load is 67A and 62A

2.Minimum service rating for each is 100Amps based on 230.79(C)

3.Single overhead riser conduit with single set service conductors is based on 129 amps

4.Based 310.15(b)(16) my over head service conductors are based on the calculated load of both units 129 amps = #1 copper conductors

Am I correct?

Or size of the service conductors is based on the main over current protection times two (so 200Amp and use 3/0)

Thank you ]]>

I am upgrading my system to bear load of 600 amperes,

Is it ok to do 70mm2 x 4 or 185mm2 x 2 would be better

Conditions:

Copper xlpe/pvc

Non armored

400 volts

temperature ambient 40C

Cable would be sandwich between two missionary wall filled with sand.

Commercially laying 70mm would cost me less than 185mm

Would support your help!!

Regards

Salman ]]>

I need some help. Can someone differentiate the two in a much clearer way? My understanding is that the prime power runs at a certain percentage of load while continuous runs at 100% load.

For example I need a 40 kVA continuous rating generator set. What will be its equivalent for the prime power generator. If possible, can you show some computations.

Thank you very much. ]]>

They will most likely be SquareD / Schneider. Max design amps is 150 but nominal load is about 120 amps.

1.) How much energy will the transformers consume through magnetizing current?

2.) How much effeciency is lost when you have to introduce a small auto transformer?

Thanks! ]]>

we have an 2500A , 480/277 V meter-service with 2500A, 3p GFI main C.B installed in corner of the property

feeding a 2500A, 480/277 V distribution gear with 2500A GFI main C.B at the exterior of the building.

Thank you ]]>

I need to take advice if its ok to install 70mm2 - 3 core non armored cable carrying 380 volts each in parallel of 4 cable to have load of 600 Ampere?

Each cable have capacity to carry 192 Amperes so 4 would be 768 Ampere!!

What should be installation technique? is gap of 20 CM enough between each cable?

Regards

Salman Khan ]]>