Middle Atlantic 5510D-WH Nonmetallic Entrance End Fitting

Overview

The 5510D-WH is a nonmetallic entrance end fitting from the 5500 Series, built to transition and feed raceway runs from larger conduit sizes at a panel, cabinet, or enclosure entry point. It's molded from PVC rather than metal, which matters on jobs where corrosion resistance or electrical isolation rules out a metallic fitting. The 5510D-WH ships in white and measures 3-1/4 x 5-13/16 x 6-7/8 in., sized to match standard 5500 Series raceway components without requiring a custom transition piece.

Key Features

• Concentric knockouts (3/4", 1", 1-1/2", 2"): four trade sizes molded into one end fitting means you size the conduit entry in the field instead of stocking four separate fittings — fewer SKUs on the truck for a multi-conduit tie-in.
• Knockouts on both end and back: lets you route conduit straight through or turn the run 90 degrees into the raceway without adding an extra elbow fitting, which simplifies tight backbox or wireway layouts.
• Two removable dividers included: splits the interior into separate compartments so you can physically segregate low-voltage data cabling from power conductors inside the same fitting, which is the kind of separation inspectors look for on mixed-voltage runs.
• PVC (non-metallic) construction: won't corrode in damp or chemically active environments the way a steel fitting can, and it's non-conductive — useful where you need to keep the raceway system electrically isolated from grounded metal conduit.
• Rectangular box style: matches the profile of 5500 Series surface raceway runs so the transition sits flush against the wall instead of creating an offset that complicates cover fit.
• White color finish: matches standard 5500 Series raceway and device covers, so the fitting doesn't stand out as a mismatched patch on a finished wall run.
• US manufactured: country of origin is listed as the United States, relevant if your project spec calls for domestic sourcing on electrical components.

Integration & Compatibility

The 5510D-WH is a 5500 Series component, so it's built to mate with other fittings, covers, and raceway sections in that same series rather than as a universal adapter. Confirm the raceway width and depth on your existing 5500 Series run before ordering, since box-style fittings in this family are dimensioned to a specific series profile and aren't interchangeable across raceway lines. If you're speccing a full raceway path for structured cabling, review a PoE and cable planning guide alongside your raceway takeoff — knockout sizing on the entrance fitting should match the conduit fill you've calculated for the run. For broader cable management components used in the same installs, see the cable management category, and for the full Legrand catalog of compatible 5500 Series parts. Electrical contractors running raceway into equipment racks may also want to check racks and cabinets for compatible entry points, and general electrical supplies for the rest of the conduit run.

What's in the Box

• 1x 5510D-WH nonmetallic entrance end fitting (white)
• 2x removable dividers

Frequently Asked Questions

Q: What knockout sizes does the 5510D-WH support?

A: It has concentric knockouts for 3/4", 1", 1-1/2", and 2" trade size conduit, located on both the end and the back of the fitting.

Q: What material is the 5510D-WH made of?

A: It's molded from PVC (non-metallic construction), which resists corrosion and provides electrical isolation compared to a metal fitting.

Q: Does the 5510D-WH include dividers?

A: Yes, it ships with two removable dividers for separating cable types inside the fitting.

Q: What color is the 5510D-WH available in?

A: White, matching the 5500 Series raceway finish.

Q: What are the dimensions of the 5510D-WH?

A: 3-1/4 x 5-13/16 x 6-7/8 in.

Q: Where is the 5510D-WH manufactured?

A: Country of origin is listed as the United States.

James Everett

The detail that matters on the 5510D-WH is the concentric knockout stack — 3/4", 1", 1-1/2", and 2" trade sizes on both the end and the back face. That's four conduit entries handled by one fitting, which is exactly what you want when you're feeding a raceway run from a larger backbone conduit and don't know the final trade size until you're standing at the wall.

Technical Highlights:

• Concentric KOs, end and back: four trade sizes (3/4"-2") on two faces means straight-through or 90-degree entry without an extra elbow fitting.
• PVC body: non-metallic construction avoids corrosion in damp mechanical rooms and keeps the raceway path electrically isolated from grounded metal conduit systems.
• 3-1/4 x 5-13/16 x 6-7/8 in. footprint: sized to 5500 Series raceway profiles, so it sits flush against existing 5500 Series wall runs without an offset adapter.

Deployment Considerations:

• The two included dividers let you separate low-voltage and power conductors inside the same fitting — confirm your local code on separation requirements before combining circuits in one entrance fitting even with dividers installed.
• This is a 5500 Series-specific part; it won't mate with a different raceway series, so verify the raceway line already on site before ordering.

Specify the 5510D-WH where a raceway run needs to step down from larger backbone conduit into 5500 Series surface raceway — a mechanical room-to-office wall transition is the typical case, particularly where non-metallic construction is preferred for corrosion resistance.