Re: [RE-wrenches] Secure/support PV wire requirements?

[Benn Kilburn]

Kris,
I'm just looking into re-stocking some cable ties and came across this
thread when searching my email for cable tie/management part numbers...
The photos you shared remind me of a system i saw recently that was
installed by a competitor here (and who happens to teach a PV install
training course).  The system i saw is similar in that there are many PV
wires clearly visible, unprotected and laying on the roof and these are a
perfect example of inspectors not doing their job properly.

I get it that "liability" keeps electrical inspectors from climbing ladders
onto the roof to inspect the array install up close, but when poor wire
management like these examples can clearly be seen from the ground and the
inspectors are not noting the wire management (or lack of) as a
deficiency they are either not properly trained in what to look for and
have no place inspecting PV systems or are simply not doing their job
properly and have no place inspecting anything.

*Benn Kilburn *
CSA Certified Solar Photovoltaic Systems Electrician, SkyFire Energy Inc
6706 – 82 Ave NW | Edmonton, AB | T6B 0E7
P: 780-474-8992 | F: 888-405-5843 | www.skyfireenergy.com
[image: email]  [image: facebook]
 [image: twitter]
 [image: linkedin]

 [image: google] 

[image: SkyFire Energy Logo_horizontal]

On Fri, Dec 11, 2015 at 9:01 AM, Kristopher Schmid 
wrote:

> I just have to post an example of how to do it wrong (courtesy of one of
> my competitors).  Pictures attached.  This passed an inspection...
>
> On Wed, Dec 9, 2015 at 8:06 AM, Rebekah Hren 
> wrote:
>
>> Hi,
>> Wondering if anyone has insight into Code requirements for
>> securing/supporting PV wire behind the modules?
>>
>> I am aware that USE-2 sends you to Section 334.30 requirements for Type
>> NM (12" from box, every 4.5 ').
>>
>> However, I think this is totally bogus, for 2 reasons.
>> 1) Section 338.10(B)(4)(b) that refers the NM article is titled "Branch
>> circuits or Feeders."  These are PV source and output circuits, not branch
>> circuits or feeders.
>>
>> 2) it is nearly IMPOSSIBLE to secure the PV wire within 12" of the module
>> junction box for many modules, especially in landscape wiring, without
>> causing more harm than good, too tight a bending radius, stress on
>> conductors.
>>
>> 334.40(B) maybe leaves a little wiggle room for concealed spaces in
>> structures where it is impracticable to support.
>>
>> My big problem here is that both requirements of 334.30 are useless or
>> harmful to PV systems. 12" to the box is often impossible, and 4.5" feet is
>> too long to go without any support behind the array!!! I just noticed there
>> was a proposal in 2017 to Codify the 334.40 requirements for PV cables and
>> so I guess I only have myself to blame for not writing a better proposal at
>> this point.
>>
>> Rebekah
>> --
>> Tel: 336.266.8800
>> NABCEP Certified Solar PV Installation Professional™ 091209-85
>> NC Licensed Electrical Contractor
>>
>>
>>
>>
>
>
> --
> Shine On!
>
> Kris Schmid
> Legacy Solar, LLC
> 864 Clam Falls Trail
> Frederic, WI 54837
> www.legacysolar.com
> 715-653-4295
> NABCEP Certified PV Installer
> Licensed Wisconsin Master Electrician
> BSEE
>
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Re: [RE-wrenches] Secure/support PV wire requirements?

[Solar]

Now that I am teaching electrical/solar more than installing electrical/solar I 
am designing labs and systems for education.  As part of my classes I spend 
lots of time discussing wire management and "safe and workman like manner" to 
students with little to no experience in electrical systems. Even these 
students can see the problems with PV wires flung on a roof with little to no 
support. So I've taken a lead from William and I have started installing all of 
our lab systems with cable management like William has shown.  We used PVC to 
support the trunk cables for our enphase pole mount and we use it on both of 
our training roofs. I hope these lessons stay with the students when they leave 
here and enter the workforce. 

Jesse Dahl

NABCEP PV Installation Professional
IBEW Local 292 - Electrician 
Electrical/Solar PV Instructor - HCC

Sent from my iPhone

> On Dec 9, 2015, at 2:30 PM, William Miller  wrote:
> 
> Ben:
>  
> Yes, we do use this technique on roof mount systems as well.  This is true 
> for micro-inverters and string inverters alike.  The PVC holds trunk cables 
> and DC cables alike.
>  
> The attention we pay to detail does add to the cost of our jobs.  The 
> development time adds to the production costs.  The Holy Grail is to develop 
> processes that are quick, efficient and use off-the-shelf components. 
>  
> You know what 1-1/2” PVC costs.  We can mill 500 feet of conduit in an hour, 
> enough for 150 modules.  One person can do it safely, two is quicker.  
> Development is again crucial—we built a jig that guides the conduit and cuts 
> the slot in one pass.  Add stainless cable ties and the total material costs 
> is about $2.50 per module.  The clips are made from the conduit scraps.  The 
> slot is widened with PVC cutters and they clip right on.  This is a very 
> solid method.
>  
> Sure the cost adds to the bottom line, and sure we lose some jobs due to 
> higher costs.  The decision to do what I do is a personal, ethical decision.  
> I have a deep sense of satisfaction in a job well done and in occupying my 
> mind and hands improving my craft.  Marketing is key.  Not everyone can 
> afford a Mercedes but some can.  I need to convince potential clients of the 
> difference between brand Miller and the rest.
>  
> I see the problem as a failure of regulators to insist on safe practices 
> on-par with other branches of the electrical industry (try running 
> unprotected wires to an air-conditioning unit and see if you get away with 
> it). The good news:  the situation is gradually improving.
>  
> Thanks for asking.  These problems and solutions are of great intrigue to me. 
>  I hope others on this list are willing to improve their techniques and that 
> I can help in some way.
>  
> Sincerely,
>  
> William Miller
>  
> By the way, Bill Brooks wrote an article addressing the specific of USE and 
> PV cable management.  I can’t lay my hands on a copy but if anyone is 
> interested and can’t find a copy on-line I will look further in my files.
>  
> Wm
>  
> 
> Lic 773985
> millersolar.com
> 805-438-5600
>  
> From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On 
> Behalf Of Benn Kilburn
> Sent: Wednesday, December 09, 2015 11:57 AM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Secure/support PV wire requirements?
>  
> William,
> Are you using this method on roof top systems that are parallel to the roof 
> as well?
> 
> I don't want to bring up the question of what cost this adds to the job 
> but here i am bringing it up!  
> (labour and material, ...measuring & cutting pipe to length, cutting slots 
> and "clips" on table saw, filing cut pipe edges, attaching to rails...)
> There is no doubt that your method shows attention to quality and workmanship 
> however the solar biz is quite competitive and making the decision to use 
> this method and its added costs would surely cost us jobs.  I'm going to 
> assume that you have been able to standardize and refine this method to 
> reduce time and costs?
> 
> All,
> I prefer to keep an assortment of wire management solutions handy on the roof 
> when we are supporting PV and/or micro-inverter wiresthose being; thick 
> nylon cable ties *MUST HAVE metal tooth, NOT plastic tooth* (T&B TY27MX), 
> stainless steel cable ties, and a couple different types of PV cable clips 
> (heyco) that attach to the rail or module frame.  
> 
> Assuming a typical house (shingle) roof top system where bottom of the mod 
> frame rests +-4-6" off the roof surface
> If it is a single row of mods with the j-boxes on the high side, then 
> securing the PV wires can usually be done after the mods are mounted and can 
>

Re: [RE-wrenches] Secure/support PV wire requirements?

[William Miller]

Ben:



Yes, we do use this technique on roof mount systems as well.  This is true
for micro-inverters and string inverters alike.  The PVC holds trunk cables
and DC cables alike.



The attention we pay to detail does add to the cost of our jobs.  The
development time adds to the production costs.  The Holy Grail is to
develop processes that are quick, efficient and use off-the-shelf
components.



You know what 1-1/2” PVC costs.  We can mill 500 feet of conduit in an
hour, enough for 150 modules.  One person can do it safely, two is
quicker.  Development is again crucial—we built a jig that guides the
conduit and cuts the slot in one pass.  Add stainless cable ties and the
total material costs is about $2.50 per module.  The clips are made from
the conduit scraps.  The slot is widened with PVC cutters and they clip
right on.  This is a very solid method.



Sure the cost adds to the bottom line, and sure we lose some jobs due to
higher costs.  The decision to do what I do is a personal, ethical
decision.  I have a deep sense of satisfaction in a job well done and in
occupying my mind and hands improving my craft.  Marketing is key.  Not
everyone can afford a Mercedes but some can.  I need to convince potential
clients of the difference between brand Miller and the rest.



I see the problem as a failure of regulators to insist on safe practices
on-par with other branches of the electrical industry (try running
unprotected wires to an air-conditioning unit and see if you get away with
it). The good news:  the situation is gradually improving.



Thanks for asking.  These problems and solutions are of great intrigue to
me.  I hope others on this list are willing to improve their techniques and
that I can help in some way.



Sincerely,



William Miller



By the way, Bill Brooks wrote an article addressing the specific of USE and
PV cable management.  I can’t lay my hands on a copy but if anyone is
interested and can’t find a copy on-line I will look further in my files.



Wm



[image: Gradient Cap_mini]
Lic 773985
millersolar.com <http://www.millersolar.com/>
805-438-5600



*From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On
Behalf Of *Benn Kilburn
*Sent:* Wednesday, December 09, 2015 11:57 AM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] Secure/support PV wire requirements?



William,

Are you using this method on roof top systems that are parallel to the roof
as well?

I don't want to bring up the question of what cost this adds to the job
but here i am bringing it up!
(labour and material, ...measuring & cutting pipe to length, cutting slots
and "clips" on table saw, filing cut pipe edges, attaching to rails...)
There is no doubt that your method shows attention to quality and
workmanship however the solar biz is quite competitive and making the
decision to use this method and its added costs would surely cost us jobs.
I'm going to assume that you have been able to standardize and refine this
method to reduce time and costs?

All,
I prefer to keep an assortment of wire management solutions handy on the
roof when we are supporting PV and/or micro-inverter wiresthose being;
thick nylon cable ties *MUST HAVE metal tooth, NOT plastic tooth* (T&B
TY27MX), stainless steel cable ties, and a couple different types of PV
cable clips (heyco) that attach to the rail or module frame.

Assuming a typical house (shingle) roof top system where bottom of the mod
frame rests +-4-6" off the roof surface
If it is a single row of mods with the j-boxes on the high side, then
securing the PV wires can usually be done after the mods are mounted and
can be done quite well with 2-4 metal PV cable clips attached to the
modules upper frame. Securing the PV cable to the mod frame within 12" can
be done and if not then let your professional judgement guide you that it
is secure and protected from coming loose and subject to potential damage
from contact with the roof or anything else.



If it is two rows of mods, one above the other, with the mod j-boxes
meeting in the middle (perhaps sharing microinverters mounted along the
middle rails). or any other combination of module layout, MC wire leads
or microinverter orientation... yes, it can become cumbersome at times to
find appropriate attachment points to secure wires... and it would be to
time consuming and confusing to discuss the array of possibilities here...
so again, you need to rely on your professional judgement to use the proper
material and methods to secure any and all wires.
This is not a task to be given to someone without an eye for detail and
workmanship.


*Benn Kilburn *

CSA Certified Solar Photovoltaic Systems Electrician, SkyFire Energy Inc

6706 – 82 Ave NW | Edmonton, AB | T6B 0E7

P: 780-474-8992 | F: 888-405-5843 | www.skyfireenergy.com

[image: email]  [image: facebook]
<https://www.facebook.com/SkyFireEnergy> [image: twitter]
<https://twitter.com/SkyFi

Re: [RE-wrenches] Secure/support PV wire requirements?

[Benn Kilburn]

Kinetic rails offer the same channels (similar design), and we always lay
the wires in the channels when possible, which still requires either a
nylon or stainless steel cable tie to hold the wires in.
Kinetic recently revised their rails design which has an additional PV wire
channel on the opposite side from the "L-foot" attachment channel. It can
accommodate up to two RPVU90 wires.
I'll post a pic...

*Benn Kilburn *
CSA Certified Solar Photovoltaic Systems Electrician, SkyFire Energy Inc
6706 – 82 Ave NW | Edmonton, AB | T6B 0E7
P: 780-474-8992 | F: 888-405-5843 | www.skyfireenergy.com
[image: email]  [image: facebook]
 [image: twitter]
 [image: linkedin]

 [image: google] 

[image: SkyFire Energy Logo_horizontal]

On Wed, Dec 9, 2015 at 1:18 PM, Kirpal Khalsa  wrote:

> SnapNrack.The rails facilitate the same wire securing possibilities as
> Williams conduit.They also have great wire clampsWorks very well on
> flush roof installs as wellI am sure there are other brands of rack
> that this will work with but we have lots of experience with the SnapNrack
> and appreciate their design with regards to securing wires underneath the
> array
>
>
> Sunny Regards,
> Kirpal Khalsa
> Oregon LRT#25
> NABCEP Certified PV Installation Professional
> Oregon Solarworks LLC
> www.oregonsolarworks.com
> 541-299-0402
>
> On Wed, Dec 9, 2015 at 11:56 AM, Benn Kilburn 
> wrote:
>
>> William,
>> Are you using this method on roof top systems that are parallel to the
>> roof as well?
>>
>> I don't want to bring up the question of what cost this adds to the
>> job but here i am bringing it up!
>> (labour and material, ...measuring & cutting pipe to length, cutting
>> slots and "clips" on table saw, filing cut pipe edges, attaching to
>> rails...)
>> There is no doubt that your method shows attention to quality and
>> workmanship however the solar biz is quite competitive and making the
>> decision to use this method and its added costs would surely cost us jobs.
>> I'm going to assume that you have been able to standardize and refine this
>> method to reduce time and costs?
>>
>> All,
>> I prefer to keep an assortment of wire management solutions handy on the
>> roof when we are supporting PV and/or micro-inverter wiresthose being;
>> thick nylon cable ties *MUST HAVE metal tooth, NOT plastic tooth* (T&B
>> TY27MX), stainless steel cable ties, and a couple different types of PV
>> cable clips (heyco) that attach to the rail or module frame.
>>
>> Assuming a typical house (shingle) roof top system where bottom of the
>> mod frame rests +-4-6" off the roof surface
>> If it is a single row of mods with the j-boxes on the high side, then
>> securing the PV wires can usually be done after the mods are mounted and
>> can be done quite well with 2-4 metal PV cable clips attached to the
>> modules upper frame. Securing the PV cable to the mod frame within 12" can
>> be done and if not then let your professional judgement guide you that it
>> is secure and protected from coming loose and subject to potential damage
>> from contact with the roof or anything else.
>>
>> If it is two rows of mods, one above the other, with the mod j-boxes
>> meeting in the middle (perhaps sharing microinverters mounted along the
>> middle rails). or any other combination of module layout, MC wire leads
>> or microinverter orientation... yes, it can become cumbersome at times to
>> find appropriate attachment points to secure wires... and it would be to
>> time consuming and confusing to discuss the array of possibilities here...
>> so again, you need to rely on your professional judgement to use the proper
>> material and methods to secure any and all wires.
>> This is not a task to be given to someone without an eye for detail and
>> workmanship.
>>
>> *Benn Kilburn *
>> CSA Certified Solar Photovoltaic Systems Electrician, SkyFire Energy Inc
>> 6706 – 82 Ave NW | Edmonton, AB | T6B 0E7
>> P: 780-474-8992 | F: 888-405-5843 | www.skyfireenergy.com
>> [image: email]  [image: facebook]
>>  [image: twitter]
>>  [image: linkedin]
>> 
>>  [image: google] 
>>
>> [image: SkyFire Energy Logo_horizontal]
>>
>> On Wed, Dec 9, 2015 at 11:33 AM, William Miller 
>> wrote:
>>
>>> Rebekah:
>>>
>>>
>>>
>>> What you desire to do is not impossible.  Most module manufacturers
>>> specify supports approximately 20% form each short side.  For a 66 inch
>>> module this is 13.2 inches.  If you attach the factory PV leads to the
>>> rail, you are close to the 12 inch requirement.  If you reduce the 

Re: [RE-wrenches] Secure/support PV wire requirements?

[Kirpal Khalsa]

SnapNrack.The rails facilitate the same wire securing possibilities as
Williams conduit.They also have great wire clampsWorks very well on
flush roof installs as wellI am sure there are other brands of rack
that this will work with but we have lots of experience with the SnapNrack
and appreciate their design with regards to securing wires underneath the
array


Sunny Regards,
Kirpal Khalsa
Oregon LRT#25
NABCEP Certified PV Installation Professional
Oregon Solarworks LLC
www.oregonsolarworks.com
541-299-0402

On Wed, Dec 9, 2015 at 11:56 AM, Benn Kilburn 
wrote:

> William,
> Are you using this method on roof top systems that are parallel to the
> roof as well?
>
> I don't want to bring up the question of what cost this adds to the
> job but here i am bringing it up!
> (labour and material, ...measuring & cutting pipe to length, cutting slots
> and "clips" on table saw, filing cut pipe edges, attaching to rails...)
> There is no doubt that your method shows attention to quality and
> workmanship however the solar biz is quite competitive and making the
> decision to use this method and its added costs would surely cost us jobs.
> I'm going to assume that you have been able to standardize and refine this
> method to reduce time and costs?
>
> All,
> I prefer to keep an assortment of wire management solutions handy on the
> roof when we are supporting PV and/or micro-inverter wiresthose being;
> thick nylon cable ties *MUST HAVE metal tooth, NOT plastic tooth* (T&B
> TY27MX), stainless steel cable ties, and a couple different types of PV
> cable clips (heyco) that attach to the rail or module frame.
>
> Assuming a typical house (shingle) roof top system where bottom of the mod
> frame rests +-4-6" off the roof surface
> If it is a single row of mods with the j-boxes on the high side, then
> securing the PV wires can usually be done after the mods are mounted and
> can be done quite well with 2-4 metal PV cable clips attached to the
> modules upper frame. Securing the PV cable to the mod frame within 12" can
> be done and if not then let your professional judgement guide you that it
> is secure and protected from coming loose and subject to potential damage
> from contact with the roof or anything else.
>
> If it is two rows of mods, one above the other, with the mod j-boxes
> meeting in the middle (perhaps sharing microinverters mounted along the
> middle rails). or any other combination of module layout, MC wire leads
> or microinverter orientation... yes, it can become cumbersome at times to
> find appropriate attachment points to secure wires... and it would be to
> time consuming and confusing to discuss the array of possibilities here...
> so again, you need to rely on your professional judgement to use the proper
> material and methods to secure any and all wires.
> This is not a task to be given to someone without an eye for detail and
> workmanship.
>
> *Benn Kilburn *
> CSA Certified Solar Photovoltaic Systems Electrician, SkyFire Energy Inc
> 6706 – 82 Ave NW | Edmonton, AB | T6B 0E7
> P: 780-474-8992 | F: 888-405-5843 | www.skyfireenergy.com
> [image: email]  [image: facebook]
>  [image: twitter]
>  [image: linkedin]
> 
>  [image: google] 
>
> [image: SkyFire Energy Logo_horizontal]
>
> On Wed, Dec 9, 2015 at 11:33 AM, William Miller 
> wrote:
>
>> Rebekah:
>>
>>
>>
>> What you desire to do is not impossible.  Most module manufacturers
>> specify supports approximately 20% form each short side.  For a 66 inch
>> module this is 13.2 inches.  If you attach the factory PV leads to the
>> rail, you are close to the 12 inch requirement.  If you reduce the offset
>> to an actual 12” you are at 18% of the module width. Either way, I suggest
>> it is close enough.
>>
>>
>>
>> How to secure the leads?  Well there are “UV resistant” wire ties, but
>> the lack of longevity of these is starting to be realized.  There are other
>> clips or metal reinforced ties that may be adequate.   Clips we tried are
>> loose and/or flimsy.
>>
>>
>>
>> We have been experimenting with various procedures for over a decade.
>> Our best method so far is to slot PVC pipe and ley the leads inside.  We do
>> this on the table saw using dual blades.  The cut is sharp and needs to be
>> deburred.  Once we lay the leads in we secure them with a clip made form a
>> short section of the same slotted pie.  We cut short lengths of the same
>> slotted pipe (3”), expand the slot using PVC cutters and it clips securely
>> over the long sections of PVC.  See attached.
>>
>>
>>
>> William
>>
>>
>>
>>
>>
>> [image: Gradient Cap_mini]
>> Lic 773985
>> millersolar.com 
>> 805-438-5600
>>
>>
>>
>> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches

Re: [RE-wrenches] Secure/support PV wire requirements?

[Benn Kilburn]

William,
Are you using this method on roof top systems that are parallel to the roof
as well?

I don't want to bring up the question of what cost this adds to the job
but here i am bringing it up!
(labour and material, ...measuring & cutting pipe to length, cutting slots
and "clips" on table saw, filing cut pipe edges, attaching to rails...)
There is no doubt that your method shows attention to quality and
workmanship however the solar biz is quite competitive and making the
decision to use this method and its added costs would surely cost us jobs.
I'm going to assume that you have been able to standardize and refine this
method to reduce time and costs?

All,
I prefer to keep an assortment of wire management solutions handy on the
roof when we are supporting PV and/or micro-inverter wiresthose being;
thick nylon cable ties *MUST HAVE metal tooth, NOT plastic tooth* (T&B
TY27MX), stainless steel cable ties, and a couple different types of PV
cable clips (heyco) that attach to the rail or module frame.

Assuming a typical house (shingle) roof top system where bottom of the mod
frame rests +-4-6" off the roof surface
If it is a single row of mods with the j-boxes on the high side, then
securing the PV wires can usually be done after the mods are mounted and
can be done quite well with 2-4 metal PV cable clips attached to the
modules upper frame. Securing the PV cable to the mod frame within 12" can
be done and if not then let your professional judgement guide you that it
is secure and protected from coming loose and subject to potential damage
from contact with the roof or anything else.

If it is two rows of mods, one above the other, with the mod j-boxes
meeting in the middle (perhaps sharing microinverters mounted along the
middle rails). or any other combination of module layout, MC wire leads
or microinverter orientation... yes, it can become cumbersome at times to
find appropriate attachment points to secure wires... and it would be to
time consuming and confusing to discuss the array of possibilities here...
so again, you need to rely on your professional judgement to use the proper
material and methods to secure any and all wires.
This is not a task to be given to someone without an eye for detail and
workmanship.

*Benn Kilburn *
CSA Certified Solar Photovoltaic Systems Electrician, SkyFire Energy Inc
6706 – 82 Ave NW | Edmonton, AB | T6B 0E7
P: 780-474-8992 | F: 888-405-5843 | www.skyfireenergy.com
[image: email]  [image: facebook]
 [image: twitter]
 [image: linkedin]

 [image: google] 

[image: SkyFire Energy Logo_horizontal]

On Wed, Dec 9, 2015 at 11:33 AM, William Miller 
wrote:

> Rebekah:
>
>
>
> What you desire to do is not impossible.  Most module manufacturers
> specify supports approximately 20% form each short side.  For a 66 inch
> module this is 13.2 inches.  If you attach the factory PV leads to the
> rail, you are close to the 12 inch requirement.  If you reduce the offset
> to an actual 12” you are at 18% of the module width. Either way, I suggest
> it is close enough.
>
>
>
> How to secure the leads?  Well there are “UV resistant” wire ties, but the
> lack of longevity of these is starting to be realized.  There are other
> clips or metal reinforced ties that may be adequate.   Clips we tried are
> loose and/or flimsy.
>
>
>
> We have been experimenting with various procedures for over a decade.  Our
> best method so far is to slot PVC pipe and ley the leads inside.  We do
> this on the table saw using dual blades.  The cut is sharp and needs to be
> deburred.  Once we lay the leads in we secure them with a clip made form a
> short section of the same slotted pie.  We cut short lengths of the same
> slotted pipe (3”), expand the slot using PVC cutters and it clips securely
> over the long sections of PVC.  See attached.
>
>
>
> William
>
>
>
>
>
> [image: Gradient Cap_mini]
> Lic 773985
> millersolar.com 
> 805-438-5600
>
>
>
> *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org
> ] *On Behalf Of *Rebekah Hren
> *Sent:* Wednesday, December 09, 2015 6:06 AM
> *To:* RE-wrenches
> *Subject:* [RE-wrenches] Secure/support PV wire requirements?
>
>
>
> Hi,
>
> Wondering if anyone has insight into Code requirements for
> securing/supporting PV wire behind the modules?
>
>
>
> I am aware that USE-2 sends you to Section 334.30 requirements for Type NM
> (12" from box, every 4.5 ').
>
>
>
> However, I think this is totally bogus, for 2 reasons.
>
> 1) Section 338.10(B)(4)(b) that refers the NM article is titled "Branch
> circuits or Feeders."  These are PV source and output circuits, not branch
> circuits or feeders.
>
>
>
> 2) it is nearly IMPOSSIBLE to secure the PV wire within 12" of the module
> junction