National standard photovoltaic panel dedicated wire

Which wiring methods are applicable for photovoltaic (PV) systems?

In general, the wiring methods presented throughout the Code are applicable for photovoltaic (PV) systems. More specifically, Part IV of Art. 690 is titled “Wiring Methods,” which helps us establish the fundamental requirements for conductor selection and installation for PV systems.

Does the National Electrical Code cover PV installations?

The National Electrical Code does not cover PV installations inautomobiles, railway cars, boats, or on utility company properties used for power generation [90-2(b)]. It also does not cover micropower systems used in watches, calculators, or self-containedelectronic equipment that have no external electrical wiring or contacts.

Who is responsible for electrical wiring a photovoltaic system?

In most locations, all electrical wiring including photovoltaic power systems must be accomplished by a licensedelectrician and then inspected by a designated local authority. Some municipalities have additional codes thatsupplement or replace the NEC. The local inspector has the final say on what is acceptable.

Can a solar panel be wired with regular cables?

According to the National Electrical Code, solar panels cannot be wired with just any cable. The only two options are PV wires and USE-2 cables. Although photovoltaic wires are preferred for solar panels, they are not the only acceptable type.

Does a PV system need to be rated for maximum voltage?

Although not explicitly stated by the NEC, it is evident that the intent of the Codeand the UL Standards is that all cable, switches, fuses, circuit breakers, andmodules in a PV system be rated for the maximum system voltage. This isclarified in the 1999 NEC [690-7(a)].

Which wire is best for a photovoltaic system?

Copper conductors are recommended for almost all photovoltaic system wiring[110-5]. Copper conductors have lower voltage drops and good resistance tocorrosion. Aluminum or copper-clad aluminum wires can be used in certainapplications, but the use of such cables is not recommended—particularly indwellings.