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
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