- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
Yep!
I resemble that remark!
Funny how I can remember things like that and can't remember a code ref. that I just read!
Yep!
I resemble that remark!
I'm still confused as to wheather or not the correct answer is 75A or 86.5A for all six loads distributed across phases A and B in the OP.
Since the case of the OP has all of the loads across only two phases then the phasor relationships for each phase can be addes lineraly and thus give a value of 86.5A. So I am in the camp that says the correct answer is 86.5A.
Is my line of thinking here correct or is it way off?
Six single phase 208 Volt 3 kVA heaters connected in a panel. . . . well that implies six two pole circuit breakers for simplicity's sake. Any one bus will have one side of FOUR two pole circuit breakers attached.So what would the load be if all six heaters were distributed evenly across all three phases?
the right answer is?
come on guys I am sure you know how to do it?
No, I'm not.Al you are forgetting the 3 phase in your last part. 28.5+28.5+28.5/1.73= 50 amps
Al you are forgetting the 3 phase in your last part. 28.5+28.5+28.5/1.73= 50 amps
Jumper,Yeah, I just came up with 12.06 kVA with Al's math.
No, I'm not.
Think about it.
How does the third current (phase B to phase C) of 28.85 add to the current in the conductor supplying the panel's phase A?
It doesn't.
There are two DPs from C to A, and two DPs from B to A. Yes.Well it does if a DP is connected from C to A. I am confused.
Jumper,
Can you show us your math (using my math )?
There are two DPs from C to A, and two DPs from B to A. Yes.
Putting DPs from B to C does not draw current from A.
I started responding and worked the math and I think I see the light.
It took me awhile but I believe I got it. Thank you.
Here, this may be part of the confusion.
The 18 kVA load is connected to a 3 ? 208 V supply in a DELTA. The is no neutral involved.
We have 120v per phase, not 208v.