Direct Burial Conductor issue- String Inverter

[andykee]

I wanted to get some thoughts on string inverter output conductors using direct burial conductors to be used at a utility solar site. Should I reference Adjustment factor Table 310.15(B)(3)(a), this specifies "conductors in raceway or cable" but I would imagine it is relevant to direct burial trenches. If this is the case what type of spacing is needed between 3 current carry conductors? Does anyone have any suggestions for an alternative method of running multiple inverter outputs from the end of a Module row?

 

[Dennis Alwon]

I moved this post from another thread .

 

[winnie]

This is one of those weird situations where the terms 'primary' and 'secondary' are quite confusing and somewhat arbitrary.

When the sun is shining, power will be flowing from the 480V side to the 208V side of this transformer.

But the 208V side of the transformer, which is connected to the service, is the primary. The service is most likely a standard grounded wye 208/120V system. The 208V of a transformer connected to this service as a 'load' should ideally be a delta. This remains true even though this 'load' is supplying power.

The key to figure out which is the primary is to ask which side gets energized from the breaker at initial power up. This is the side which will have the inrush current.

-Jon

 

[winnie]

Whoops. I was responding to the original thread...and somehow my response got tied to the new moved thread. My bad for not double checking where I was replying....

-Jon