sparks1
Senior Member
- Location
- Massachusetts
What is the maximum distance and wire size for a 200 amp UG residential servive.
Where do you find the power factor?...and you use Table 9, effective impedance for 0.85 power factor
I think it's easier to use one of the on-line voltage drop calculators.Originally posted by sparks1:
Can you provide formula for the above.
We stop at the cash register (meter) and what is done beyond that is the customer's responsibility. If we have a voltage complaint, we are responsible for maintaining the voltage to the service point which is basically at the cash register. If you want to run 200 amperes, 500 ft with #10 copper and it is behind the service equipment, it is OK with us. By the way, under that scenario that is a 500 ft long fuse if you can actually pull 200 amperes through the run.In general and considering cost, what would be maximum distance the poco would allow.
Originally posted by charlie:
[QB]If you want to run 200 amperes, 500 ft with #10 copper and it is behind the service equipment, it is OK with us.
Come on charlie do you really think so
It wouldn't be ok with the inspector!
Here are some ballpark numbers for a 200 amp service.
You could run 250 mcm cu to deliver a demand load of 100 amps for a 120/240v 200 amp service a distance of 480'@5%vd .
[ July 18, 2005, 08:22 PM: Message edited by: sparks1 ]
The Vd calculator at electrician.com gives the following: for #250 Cu, 240V single phase, circuit length 480' one way, 100 amp load = a 5 volt drop = 2.1% voltage drop (Vd).Originally posted by sparks1:
Here are some ballpark numbers for a 200 amp service.
You could run 250 mcm cu to deliver a demand load of 100 amps for a 120/240v 200 amp service a distance of 480'@5%vd .
I based my calculation on the one way distance given from the link , assuming this means out and back to the load. I used 120v for maximum unbalance on the neutral not 240v since these loads are balanced.Originally posted by tx2step:
Edited to add:
Of course, that's with the load pretty well balanced between the 2 phases. If you have a widely unbalanced load on just 1 phase, then the Vd goes up. [/QB]
Originally posted by sparks1:
Originally posted by charlie:
[QB]If you want to run 200 amperes, 500 ft with #10 copper and it is behind the service equipment, it is OK with us.
Come on charlie do you really think so
It wouldn't be ok with the inspector!
Here are some ballpark numbers for a 200 amp service.
You could run 250 mcm cu to deliver a demand load of 100 amps for a 120/240v 200 amp service a distance of 480'@5%vd .Correction 580'
Originally posted by growler:
[QB] The question is not right to start with if you are going to try and use it on a test ( just guessing ). It should read, what is the maximum distance and wire size for a 200 AMP UG residential service to operate at reasonable efficiency.
Its a trick question for the students to go figure. You can't have reasonable efficiency with excessive voltage drop. So lets use 4/0 cu
3% vd to the meter and a demand load of 100 amps
this will allow us a distance of 490'.