The load being fed requires a 1600A circuit, which initially would require a 1600A breaker and (4) sets of (3) #600 CU & (1) #4/0 GRD. However, the feeder must be increased to (8) sets of #600 CU to meet voltage drop requirements.

Since the total area of the ungrounded conductors was doubled, the equipment grounding conductor must be doubled as well. So then, would the appropriate feeder be (8) sets of (3) #600 CU & (2) #4/0 GRD?

Or would you still use (1) #4/0 EGC per conduit, because the total area of all the EGCs is greater than (2) #4/0? ]]>

So here's what I'm up against. I have a 1200 amp bus duct with a 1000 ton injection molding machine (600 amps FLA) a 800 ton Injection molding machine (400 amps) another 800 injection molding machine (400 amps). Now the amperage of machines is not what they draw, it's just what they are feed with because of nameplate rating. they each have heats and motors to run hydraulic pumps. the 1000 ton and one of the 800 tons have VFDs. Now my question is do I have to pick apart the whole machine for a load calc or would I size the bus duct off the machine nameplate???? I'm at a loss with this! ]]>

Much appreciated,

Mike ]]>

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. ]]>