78310500 | Pentair Brass Junction Box For Lights | 1/2" | 3 Port

The OEM Pentair Brass Junction Box 78310500 is a heavy-duty lighting system component designed for use in outdoor pool and spa installations. Featuring a brass base and polycarbonate cover, it offers long-term weather resistance and structural integrity in demanding environments. With three 1/2-inch conduit ports, this junction box simplifies organized cable routing for multiple light connections. The sleek black finish blends into poolside surroundings, while its compact dimensions (5-3/8" x 3-5/8" top, 4-1/4" x 2-1/2" bottom) allow for discreet placement. UL-listed terminals ensure proper grounding and compliance with NEC standards, making this junction box ideal for safe, reliable lighting installations.

Highlights

• Made for Outdoor Lighting Systems: Designed for pool and spa environments, with a durable brass base and weather-resistant polycarbonate cover for long-lasting performance.

• Supports Organized Wiring: Three 1/2" conduit ports offer clean, efficient cable management for multiple lighting connections, simplifying installation and future maintenance.

• Compact, Low-Profile Housing: Its non-obtrusive footprint fits easily into tight outdoor spaces without compromising cable access or safety.

• NEC-Compliant Safety Features: Includes grounding terminals and strain relief fittings per National Electrical Code guidelines, ensuring safe and secure installation by licensed professionals.

• Aesthetic and Protective Finish: The black coating offers a clean, professional look while helping shield internal components from environmental wear.

Includes

• (1) Pentair 78310500 Brass Junction Box

Compatibility

• Pentair Pool and Spa Lights

Instructions

A. THE FOLLOWING PREPARATORY STEPS MUST BE COMPLETED BY THE CERTIFIED ELECTRICIAN BEFORE LIGHT IS INSTALLED
1. Ensure that the electrical system of your pool conforms with all requirements of the National Electrical Code (NEC),
and all local codes and ordinances. A licensed or certified electrician must install the electrical system to meet or
exceed those requirements before the Junction Box is installed. Some of the NEC requirements are listed below.
2. To be certain that the pool’s electrical system meets all applicable requirements, the electrician should
also consult the local building department.
3. Position Junction Box to meet National Electrical Code (NEC) requirements and to prevent hazard to personnel.

4. The center conduit hub is provided with a strain relief for a cord size up to a 10/3 AWG cord. Use underwater lights
with water resistant cord only.
5. Three equipment grounding terminals are provided for internal grounding suitable for #16 AWG to #10 AWG wire.
One pressure wire grounding terminal is provided for a #8 AWG insulated copper bonding wire.
6. Install the Junction Box gasket between the Junction Box base and cover. Replace gasket if worn or damaged (P/N
79300600).
7. Plug any unused conduit hubs with the conduit plugs provided.

Additional Info

Ensure your lighting install is safe and up to code with the Pentair Brass Junction Box 78310500. Below you'll find common install, safety, and compatibility FAQs to help you complete your setup confidently.

Installing the Pentair Junction Box (Certified Electrician Required)

This junction box is designed to meet NEC standards and must be installed by a licensed professional. Follow manufacturer instructions closely for safe and code-compliant installation.

Is a certified electrician required to install this junction box?

How many conduit hubs are on this box?

Does Discount Pool Mart stock this for same-day pickup?

What size strain relief does the center conduit support?

Can this be used for retrofitting older light setups?

What to Know About Code Compliance

Understanding NEC and local codes is crucial for safe lighting system operation. The 78310500 is made to meet these standards with grounding terminals and conduit seals included.

What NEC requirements apply to this junction box?

How do I ground the unit during install?

Does it come with a replacement gasket if needed?

Can I seal off unused conduit ports?

Is this model compatible with underwater lighting systems?

Confirming Fitment & Functionality

This junction box features a compact footprint and a sleek black finish that works with most pool environments. Here's what to know before purchase.

What are the exact dimensions of the junction box?

Will it fit behind existing pool or spa light setups?

Is the finish UV- and chemical-resistant?

What size cable can the strain relief handle?

Can I get this in-store with install guidance?