and JB-1.XL Instruction Manual

ManualsBrandsEZ Solar ManualsCombiner BoxesRooftop PV Junction Box

The JB-1 is an outdoor PV rooftop junction box used on Composition/Asphalt Shingle Roofs. All wires are to

be copper conductors with insulation rated to 75°C or higher. To ensure dependable long-term connection it is

required to use outdoor rated, UL 514B, NEMA 3R approved fittings and/or strain reliefs. The JB-1 does not

come with fittings, wire nuts, din-rail, terminal blocks or grounding blocks due to site-specific needs. It is the

responsibility of the installer to specify the proper accessories for the installation. Follow the installation

instructions from the fittings, strain reliefs, din-rails, terminal blocks and grounding block manufacturer and

follow the National Electrical Code, ANSI/NFPA 70 wiring methods and guidelines. When using terminal

blocks, wiring shall be in conformance to wire bending space as listed in UL1741 or as shown in Table 2.

The JB-1 is nonconductive and therefore does not need to be grounded. However, this also means the box

cannot be used to maintain an electrical bond between fittings. Ensure all proper jumpers or other bonding

mechanisms are in place per NEC. The PV system grounding shall be installed per the requirements of

Sections 690.41 through 690.47 of the National Electrical Code, ANSI/NFPA 70, UL1741 and is the responsi-

bility of the installer.

When installing a conduit hub, the hub shall be connected to the conduit before the hub is connected to JB-1.

To maintain the JB-1’s 3R rainproof rating of the enclosure lid must close freely without interference from

wires and be secured with the provided screws to 15-20 lb-in. Failure to properly close the lid can lead to

excessive water ingress leading to an electrical short and possibly a fire.

(1) JB-1.2 Body

(1) JB-1.2 Lid

(1) Neutral Bar and Din Rail

(6) #8 x 3/4” Phillips pan head screw

(6) #10 x 1-1/4” Phillips pan head screw

(1) JB-1.XL Body

(1) JB-1.XL Lid

(1) Neutral Bar and Din Rail

(6) #8 x 3/4” Phillips pan head screw

(4) #10 x 1-1/4” Phillips pan head screw

B. Materials Included

C. Wiring and Proper Use

D. System Specifications and Ratings

JB-1.2 JB-1.XL

JB-1.2 Specifications:

• Maximum Voltage: 1,000 Volts

• Maximum Current: 80 Amps

• Allowable Wire: 14 AWG – 6 AWG

• Spacing: Please maintain a spacing of at

least ½” between uninsulated live parts and

fittings for conduit, armored cable, and

uninsulated live parts of opposite polarity.

• Enclosure Rating: Type 3R

• Roof Slope Range: 2.5 – 12:12

• Max Side Wall Fitting Size: 1”

• Max Floor Pass-Through Fitting Size: 1”

• Ambient Operating Conditions:

(-35°C) - (+75°C)

• Compliance:

- UL1741

- Approved wire connectors:

must conform to UL1741

JB-1.XL Specifications: