Ground-fault protection device [NEC 690.5]
System disconnects—Each PV disconnecting means in
the system shall be permanently marked to identify it as a
PV system disconnect. [NEC 690.14(c)(2)]
Open energized terminals should say the following:
“WARNING. ELECTRIC SHOCK HAZARD. DO NOT
TOUCH TERMINALS. TERMINALS ON BOTH THE LINE AND LOAD
SIDE MAY BE ENERGIZED IN THE OPEN POSITION.” (NEC 690.17)
Local code offices, inspectors, and the local utility have the final say in all instal-
lations. Labeling every appropriate component will enable the PV inspector to
verify proper conductor ampacity. They will also check equipment against draw-
ings. They will be able to confirm overcurrent device ratings. Labeling also allows
the user to compare system performance with the manufacturer’s specifications.
Access, Pathways, and Smoke Ventilation Requirements
Roof access points are places where nothing can block the opening. They are
located at load bearing positions within the building’s structure. They are not to
NOTE
Disconnects may not be located in
bathrooms.
CODE
NEC 2011, 690.31 (3) – (4)
(3) Marking or Labeling Required. The following wiring methods and enclosures that contain
PV power source conductors shall be marked with the wording “Photovoltaic Power Source” by
means of permanently affixed labels or other approved permanent marking:
1. Exposed raceways, cable trays, and other wiring methods
2. Covers or enclosures of pull boxes and junction boxes
3. Conduit bodies in which any of the available conduit openings are unused
4. Marking and Labeling Methods and Locations. The labels or markings shall be visible
after installation. Photovoltaic power circuit labels shall appear on every section of the
wiring system that is separated by enclosures, walls, partitions, ceilings, or floors. Spacing
between labels or markings, or between a label and a marking, shall not be more than 3 m
(10 ft). Labels required by this section shall be suitable for the environment where they are
installed.
Reprinted with permission from NFPA 70
®
, National Electrical Code
®
, Copyright© 2010, National Fire
Protection Association, Quincy, MA.
CHAPTER 2 Essential Safety Practices for Designing and Installing PV Systems 35
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