Why would you want to do that? BTW, if the system is ungrounded (most are these days) none of your conductors can be white.Is there an issue with positive (black) conductors being in one raceway and the negative (white) conductors being in the other? Array to combiner box raceways.
Why would you want to do that? BTW, if the system is ungrounded (most are these days) none of your conductors can be white.
When working with bipolar arrays it is common to keep the three conductors (or sets of parallel conductors) separated in different raceways.
It minimizes the line to line voltage.
This is DC??
Whoever is issuing your instructions may not be aware of this requirement, and it could (should, actually) cause you to fail your inspection if done incorrectly. If it were I doing the installation, I would verify that that the DC is negatively grounded at the inverter before proceeding. Doing it over is almost always much harder than doing it right the first time.Was told to run white and black instead of red and black. So it must be the other system.
It's not dangerous in the same way that AC circuits could start a fire with inductive heating, but it's still a violation of 300.6(I) in the NEC.
As for why you'd want to do it, I know sometimes it's tempting to jump just one conductor between arrays if you're circuit loops back the other way, but by and large if you're keeping things organized it should never happen.
Is there anything in 690 that changes the requirements of 300.3(B)?
The main issue is that you will magnetize the conduits if you do this. Unlike AC, where the inductive heating is dangerous, with DC, it will only statically magnetize the conduits. That is, it will create a steady magnetic field in the conduits and surroundings.
Was told to run white and black instead of red and black. So it must be the other system.
The reason is negative is in one side and positive is on the other. Was told to have all negatives on one side through sleeves and to combiner box. Then run positives across under array from combiner the through sleeves on other end of array.
Well, I don't know what your jobsite looks like, but this just sounds a bit weird. I agree with everything ggunn said. Anything run through sleeves should have the positive run with the negative for that given string or circuit.
How strong a magnetic field are we talking about at, say, 300V and 7 amps?
I attached a picture to show what I am questioning. As you can see thirteen moduels are across with negative on one side and positive on the other.
Once you leave the vicinity of the array completely, you now are required to route both polarities together.
I attached a picture to show what I am questioning. As you can see thirteen moduels are across with negative on one side and positive on the other.
Can you give a code section for that? I couldn't find it.
300.3(B), assuming one is running the circuits in raceways.