Electrical question

[buickanddeere]

Wire for wire, much more Amps in a hi voltage short. Wires are resistors.

Short circuit amperage of a 100Kw 600V transformer is lower than the short circuit from a 208V 100Kw transformer .

 

[newbury]

Anyone know why a 12 AWG is allowed for a 20A 120v single phase circuit but 10 AWG is required for a 30A 2 phase 240v circuit? The 30A 240v is actually carrying less amps per wire than the 20A 120v.

60 replies and maybe I missed it but NOBODY questions the electrical knowledge of someone talking about a 2 phase circuit?

Sorry, but that indicates immediately the OP needs a lot of training to be safe.

 

[LD1]

60 replies and maybe I missed it but NOBODY questions the electrical knowledge of someone talking about a 2 phase circuit?

Sorry, but that indicates immediately the OP needs a lot of training to be safe.

Post #6 did address that

 

[SPYDERLK]

Short circuit amperage of a 100Kw 600V transformer is lower than the short circuit from a 208V 100Kw transformer .

Watt? :confused2:​

 

[buickanddeere]

Watt? :confused2:​

When the magnetic core of a 600V 100Kw is saturated during a dead short . The short current current is lower than a shorter 208V 100Kw transformer .

 

[joeu235]

60 replies and maybe I missed it but NOBODY questions the electrical knowledge of someone talking about a 2 phase circuit?

Sorry, but that indicates immediately the OP needs a lot of training to be safe.

Seeing as I had two years of training and ran the nuclear power plant on a submarine for 6 years and then repaired industrial 3 phase equipment for another 5, I think I'm safe.

I should have used the term split phase instead of 2 phase

 

[GLyford]

Not very many real two phase systems left anymore...

Two-phase electric power - Wikipedia

 

[SPYDERLK]

When the magnetic core of a 600V 100Kw is saturated during a dead short . The short current current is lower than a shorter 208V 100Kw transformer .

Yes , but the Power output to the resistive "short" is greater due less loss in the lines supporting the current.

Really beside the point of the 1st example you made comparing the arc you can get from a 12V batt to that available from a power line.​

Its easy to drive high current with high voltage. Transformers serving neighborhoods can source high current and wires leading to the short dont need to be large to conduct thousands of Amps briefly thru your main breaker to service a short. Huge Watts.

With 12V you must have a very specialized battery and huge conductors to service those currents ... and the comparable Watts available at short are even more unattainable.​