Parallel triplexes
- Thread starter GlennH
- Start date
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ptonsparky
Tom
- Occupation
- EC - retired
Assuming you meet all requirements for everything else, sure.
ptonsparky
Tom
- Occupation
- EC - retired
I would be more inclined to quad instead of triplex.
Well, I kinda got thrown into a project started by someone else.
PV system with panels and inverters on a building with POCO single phase service on another
about 100 ft. between buildings with about 150 ft. total length of wire
Having a problem with overvoltage on inverters when sun is at peak.
Wires were already replaced with larger(2/0 AL.)
peak output on wires is about 86 amps.
according to calc (http://america.sma.de/vdropcalculator.html) voltage rise is still not quite at recommended level
When looking at job, thought crossed my mind about paralleling wire between buildings, which is what prompted question because I had never seen it done before.
POCO will not change transformer because it is within specs.
Humor me here-- Wire (3-insulated and 1-uninsulated) between buildings has the bare wire and one of the insulated wires joined together at both ends.
So I have 2 hots and a paralleled neutral, I was thinking of seperating the insulated neutral from bare and paralleling it with one of the hot legs to see what effect that has on the voltage rise of that leg compared to the other one.
Worth the effort or not??
PV system with panels and inverters on a building with POCO single phase service on another
about 100 ft. between buildings with about 150 ft. total length of wire
Having a problem with overvoltage on inverters when sun is at peak.
Wires were already replaced with larger(2/0 AL.)
peak output on wires is about 86 amps.
according to calc (http://america.sma.de/vdropcalculator.html) voltage rise is still not quite at recommended level
When looking at job, thought crossed my mind about paralleling wire between buildings, which is what prompted question because I had never seen it done before.
POCO will not change transformer because it is within specs.
Humor me here-- Wire (3-insulated and 1-uninsulated) between buildings has the bare wire and one of the insulated wires joined together at both ends.
So I have 2 hots and a paralleled neutral, I was thinking of seperating the insulated neutral from bare and paralleling it with one of the hot legs to see what effect that has on the voltage rise of that leg compared to the other one.
Worth the effort or not??
ramsy
NoFixNoPay Electric
- Location
- LA basin, CA
- Occupation
- Service Electrician 2020 NEC
At 86amps, one 2/0 AL feeder in conduit is below 0.7% rise and under 50?C, quite acceptable. Equivalent Triplex in free air is even better.
It is important to calculate VRise for the entire system, from the array to the PCC, not just the feeders.
One of the best ways to minimize array voltage rise in a fully populated branch is to center-feed the branch. A study describing this process, and VRise analysis is available as a technical brief published by Enphase.
It is important to calculate VRise for the entire system, from the array to the PCC, not just the feeders.
One of the best ways to minimize array voltage rise in a fully populated branch is to center-feed the branch. A study describing this process, and VRise analysis is available as a technical brief published by Enphase.
ramsy
NoFixNoPay Electric
- Location
- LA basin, CA
- Occupation
- Service Electrician 2020 NEC
My 0.7% value above was for an alternating current feeder, not the same as Direct Current. Not clear if your feeder was AC or DC.
An 0.8% value is shown by your Sunny Boy calculator, which also looks like an alternating current value.
We both could be way off, so you might measure the actual feeder rise with a meter in the field to see if it exceeds recommended rise.
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