Need advice on drawings

[sdold]

Irreversible is/was removed

I just meant that you need to check your spelling, you had two wrong letters in there. Clean this stuff up or they'll think you are working for Substandard Construction. heh heh

[GreenTeeCrazy]

Connecting the Aluminum J-BOX to the Al rail:

Any adapter or plate should i use or can i use a zinc plated self-tapping screws from inside J-Box to the rail?

Running the #6 ground wire:

As you can see in my diagram, I run the ground wire from top to bottom in circuit 2, then run it to Circuit 1 going up to the top rail then back to the J-Box by the lower left end. in the shape of "nj"

Is it ok by code to backloop the ground wire?

[Naptown]

All hardware should be stainless steel
What NEC code cycle are you on?
You may be able to just ground each rail and bond the inverters to the rail with web clips. Same with modules.
Most racking now a days allows this.

[foo1bar]

I
running the cable from Ciruit 2 to Circuit 1 to MNPV6 using 1" Utlratite NM conduit. After inspection is passed ( permit 1st lol) I am going to spray paint it to match the siding of the house. I'll discuss that with the inspector 1st.

How are you supporting it as it goes across the roof, then up the wall. (You won't want it on on the roof - you probably want it 4" off the roof because of temp de-rating)
How are you getting it around the edge of the roof at the top of the wall?

Are you completely exterior to the structure with all your wiring? (If you were doing a regular string inverter, you'd need the wires inside the structure inside metallic conduit I think... With enphase microinverters, I'm not sure how those rules apply to them) But I think you're completely outside - so that shouldn't be a problem.

With flexible conduit you will need to make sure that you're not making too many bends because of it sagging between support points.

[GreenTeeCrazy]

All i could find at HD was the Aluminum 1 and 2 gang box
NEC 2011.
Enphase M250 are grounded using engage cable.
So i guess it ok to run the cable from point A, run it around the circuit and return back to point A?

My installation setup:

Connect Engage cable to J-Box 2 in Circuit 2 using liquid tight adapter.
From J-Box 2, run #10 inside Ultratite conduit connect to J-Box 2 using 1" liquidtight adapter.
using large stapler to hook the conduit to the 3ft siding (valley), If the bend is too great then i'll have to use 1 of those 90 degree adapter.
Tie the conduit to the rail using Stainless steel or nylon zipties to keep the conduit from touching the roof every 3 feet. no more than a ft away from J-Boxes

and do the same again on Circuit 1 to the AC Combiner.

The whole wiring is done outside the house.

[JFinch57]

Connecting the Aluminum J-BOX to the Al rail:

Any adapter or plate should i use or can i use a zinc plated self-tapping screws from inside J-Box to the rail?

Running the #6 ground wire:

As you can see in my diagram, I run the ground wire from top to bottom in circuit 2, then run it to Circuit 1 going up to the top rail then back to the J-Box by the lower left end. in the shape of "nj"

Is it ok by code to backloop the ground wire?

I like these Enphase brackets, but for some reason you have to elongate the holes to fit a standard square box. Also, the M250s have integral ground that carries through to the racking if properly bonded by the racking manufacturer's instructions. There should be no additional ground wires required. See http://www.ecodirect.com/ProductDeta...FYQ_aQodaE0IbA

[GreenTeeCrazy]

I like these Enphase brackets, but for some reason you have to elongate the holes to fit a standard square box. Also, the M250s have integral ground that carries through to the racking if properly bonded by the racking manufacturer's instructions. There should be no additional ground wires required. See http://www.ecodirect.com/ProductDeta...FYQ_aQodaE0IbA

THAT'S IT!!!!

Exactly what i am looking for.

[tehan]

Enphase M250 are grounded using engage cable.
So i guess it ok to run the cable from point A, run it around the circuit and return back to point A?

Code is always subject to interpretation and the only thing that matters at this point is what will get you past inspection. Enphase's position is you don't need that #6 grounding conductor at all because all the grounding required for an ungrounded PV system is provided by the grounding conductor in the Engage cable (assuming you use a suitable washer to bond the M250 to the rail). Some inspectors don't agree.

[GreenTeeCrazy]

Code is always subject to interpretation and the only thing that matters at this point is what will get you past inspection. Enphase's position is you don't need that #6 grounding conductor at all because all the grounding required for an ungrounded PV system is provided by the grounding conductor in the Engage cable (assuming you use a suitable washer to bond the M250 to the rail). Some inspectors don't agree.

Correct about the M250
#6 is for the rails and the Solar modules ground.
is it ok to have the ground wire be installed as a "n" shape? start from 1st rail go up to the 6th rail then connect back at the 1st rail again?

[tehan]

Correct about the M250
#6 is for the rails and the Solar modules ground.
is it ok to have the ground wire be installed as a "n" shape? start from 1st rail go up to the 6th rail then connect back at the 1st rail again?

You can read more at https://enphase.com/sites/default/fi...stem-v2703.pdf

but the bottom line is:

"In an Enphase Microinverter System, if the microinverters and modules are bonded to the racking
assemblies with the use of listed and approved grounding clips or grounding components, the equipment
grounding conductor provided to the microinverters through the Enphase Engage Cable may also be
used to ground the other photovoltaic system components."

[JFinch57]

Correct about the M250
#6 is for the rails and the Solar modules ground.
is it ok to have the ground wire be installed as a "n" shape? start from 1st rail go up to the 6th rail then connect back at the 1st rail again?

With my Unirac I don't need any additional ground wires on the roof. The inspector has also approved it. I used #10 for my ground mount M190 system.

[GreenTeeCrazy]

I wish i had known about that form

I'll wait til i hear from the Building permit Dept.

[foo1bar]

Correct about the M250
#6 is for the rails and the Solar modules ground.
is it ok to have the ground wire be installed as a "n" shape? start from 1st rail go up to the 6th rail then connect back at the 1st rail again?

Unnecessary IMO.

I believe all your ground wires within Jbox1 have to be connected together. So you'll have one that leaves there for Jbox2

You may be able to just use the enphase cable for grounding the racking - I'll leave that up to you to determine.
If you can't, it's easy to run a bare #6 from each Jbox to the 3 bottom rails of the panels (only need to hit 1/2 the rails with ironridge - the bonding mid-clamps bond the other rail via the modules).
If you go that path you will need an "Ironridge grounding lug" or some other means to bond the #6 to the rail. Mine could fit under my panels and be hidden by them - but since I wasn't sure if there'd be clearance, I made sure I had sufficient wire to get to the edge of the array and run up alongside the panels.

[GreenTeeCrazy]

Unnecessary IMO.

I believe all your ground wires within Jbox1 have to be connected together

How sure are you of this statement, cause it will my life a lot easier

[foo1bar]

How sure are you of this statement, cause it will my life a lot easier

I believe this is the relevant code:
250.148 Continuity and Attachment of Equipment
Grounding Conductors to Boxes. Where circuit conduc-
tors are spliced within a box, or terminated on equipment
within or supported by a box, any equipment grounding con-
ductor(s) associated with those circuit conductors shall be con-
nected within the box or to the box with devices suitable for
the use in accordance with 250.148(A) through (E).

So, if it's just a pass-through for the wires going to jbox2, *I* would interpret this as not strictly requiring the EGC for jbox2's connections to be connected to jbox1's ground terminal.
BUT if you spliced the wires inside jbox1 it would require both EGCs to be tied to the box (and therefore to each other).

That's *my interpretation*

My interpretation is also that there's nothing that says you can't still tie them together in Jbox1.
And it can be a reversible splice since it's an EGC and not a GEC. (You should double check to be sure enphase installation is EGC's not GEC's - but I'm pretty sure the "ground wire" is an EGC.)

However I am not the one doing the installation nor the one inspecting it. I'm just an un-credentialed semi-anonymous person on a free message board