618electrician
Member
- Location
- St. Louis
- Occupation
- Maintenance electrician
208 a phase A 10 amps phase B 5 amps neutral amps = ??????????????????????????????????????????????????????????????????????????????????????
208 three phase
- Thread starter 618electrician
- Start date
Eddie702
Licensed Electrician
- Location
- Western Massachusetts
- Occupation
- Electrician
If it is single phase 2 hots and a neutral Phase A 10 amps phase B 5 amps the neutral carries the imbalance which is 10-5=5 amps.
Not for a wye system
Eddie702
Licensed Electrician
- Location
- Western Massachusetts
- Occupation
- Electrician
He only gave amps for phase a and phase b. I don't see phase c being used. 2 hots and a neutral. For that portion of the circuit only will the neutral not see a 5 amp load?
618electrician
Member
- Location
- St. Louis
- Occupation
- Maintenance electrician
THREE PHASE
Eddie702
Licensed Electrician
- Location
- Western Massachusetts
- Occupation
- Electrician
You don't have to yell. What is the load on phase C if they are using 3 phase. The post title says three phase but he is only using 2 legs and a neutral.
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
If it is a three phase circuit, then it’s unsolvable without knowing what C phase current is.
Additionally you would need to know the phase of the currents/power factors of the loads.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
0 load on C phase I get 8.7 amps on the neutral.
Same here, assuming the currents are 120° from each other.
In a wye configuration they are
For a fun read see the thread from long ago and use two of the phases
Unbalance neutral current in a 3 phase system
I have been told that to calculate the amount of current on the neutral of a three phase system, you simply take the square root of the highest phase current. I have an extensive engineering backgrond and I know that this is not possible. For example, if phase A = 49A and phase B = 47A and phase...
forums.mikeholt.com
If you have loads with various power factors, they may not be.
Tulsa Electrician
Senior Member
- Location
- Tulsa
- Occupation
- Electrician
