NEMA ei June 2017 - 18



Shining a Light on PV Wire
Christel Hunter,
Director, Codes
and Standards,
Cerro Wire LLC


he Solar Energies Industry Association (SEIA) reports that more
than 42 GW of solar capacity has been installed in the United
States as of the end of 2016; SEIA predicts that by 2021 there
will be more than 100 GW of solar installed. With the continued
demand for solar energy, photovoltaic (PV) wire continues to be a
subject of discussion within the NEMA Wire & Cable Section.

The National Electrical Code® (NEC) Article 690
permits the use of listed PV wire for single-conductor
applications installed in outdoor, exposed locations
and within outdoor tray cables. When PV wire is used
in a conduit system, the designer and installer must
use the outer diameter values provided by the wire
manufacturer to calculate conduit fill, since PV wire
dimensions are not included in the NEC. PV wire may
also be used in direct burial installations if it is listed
and identified for direct burial.
NEMA members participate in the CANENA
harmonization process, where there is a current effort
to harmonize the product construction and testing
standards for PV wire. Once completed, the draft





June 2017

standard will be processed by UL, the CSA Group,
and the Mexican Association of Standardization and
Certification (ANCE) for official recognition within the
United States, Canada, and Mexico.
PV wire has to endure a variety of rugged installation
conditions, such as extreme high and low temperatures,
exposure to direct sunlight, direct burial, flexing when
used with tracker modules, and wet locations. During
the product certification process, PV wire is tested to
verify that it can withstand expected conditions.
Currently, ANSI/UL 4703 Standard for Safety for
Photovoltaic Wire is used to evaluate PV wire for use in
the United States. PV wire can be marked up to 90°C
in wet locations and up to 150°C in dry locations, with
conductor voltage ratings of 600 V, 1000 V, or 2000 V.
Harmonizing the requirements for PV wire in
North America will allow for greater efficiencies for
manufacturers and increased choice for PV wire
consumers. ei


Table of Contents for the Digital Edition of NEMA ei June 2017

Comments from the Chairman
Electric News
Looking Ahead for Building Systems
Adding Value through ESPCs
Energy Benchmarking Equals Energy Savings
Case Studies: NEMA Members Go Big on Innovation
Shining a Light on PV Wire
Code & Standards
Business Analytics
NEMA ei June 2017 - Cover1
NEMA ei June 2017 - Cover2
NEMA ei June 2017 - 1
NEMA ei June 2017 - 2
NEMA ei June 2017 - Comments from the Chairman
NEMA ei June 2017 - Views
NEMA ei June 2017 - Electric News
NEMA ei June 2017 - Looking Ahead for Building Systems
NEMA ei June 2017 - Adding Value through ESPCs
NEMA ei June 2017 - Energy Benchmarking Equals Energy Savings
NEMA ei June 2017 - 9
NEMA ei June 2017 - Case Studies: NEMA Members Go Big on Innovation
NEMA ei June 2017 - 11
NEMA ei June 2017 - 12
NEMA ei June 2017 - 13
NEMA ei June 2017 - 14
NEMA ei June 2017 - 15
NEMA ei June 2017 - 16
NEMA ei June 2017 - 17
NEMA ei June 2017 - Shining a Light on PV Wire
NEMA ei June 2017 - 19
NEMA ei June 2017 - Advocacy
NEMA ei June 2017 - Code & Standards
NEMA ei June 2017 - 22
NEMA ei June 2017 - International
NEMA ei June 2017 - Business Analytics
NEMA ei June 2017 - Spotlight
NEMA ei June 2017 - Cover4