6 Best Non-conductive Mounting Plates For Electrical Equipment

Mounting electrical fixtures on exterior siding is a task that frequently separates clean, professional installations from amateur, leak-prone work. Using the correct non-conductive mounting plate prevents corrosion, ensures a watertight seal, and provides a stable base that won’t crack or warp under temperature swings. Selecting the right product requires matching the plate’s profile to the specific siding type and the weight of the fixture being supported. These six options represent the industry standard for durability, ease of installation, and long-term performance in diverse climates.

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Arlington 8161-1: Best Universal Siding Block Kit

The Arlington 8161-1 earns its reputation as a universal problem solver because it accommodates almost any siding profile. Its adjustable design allows for a flush, professional finish regardless of whether the structure features lap, Dutch lap, or beaded siding.

Because the mounting surface is large and flat, this block provides exceptional stability for exterior light fixtures or security cameras. The non-conductive, paintable UV-rated plastic ensures the block won’t become brittle under the harsh midday sun.

Installation remains straightforward, as the kit includes everything needed to bridge the gap between the building sheathing and the exterior cladding. When mounting heavy fixtures, ensure the mounting screws penetrate the wall studs behind the siding to prevent the block from pulling away over time.

Orbit EMLB1: The Top Value All-Purpose Mount Plate

For contractors and homeowners looking for a reliable, no-frills mounting solution, the Orbit EMLB1 offers the best balance of cost and utility. It serves as a sturdy, high-impact polycarbonate plate that effectively moves the electrical box away from the siding surface.

This plate is specifically designed to minimize the footprint on the wall while maintaining a secure attachment point. It is an ideal choice for simple porch lights or wall-mounted motion sensors where a low profile is preferred for aesthetic reasons.

Keep in mind that while the EMLB1 is budget-friendly, it lacks some of the decorative flange depth of higher-end blocks. Use it in areas where the siding is relatively flat or where the electrical box can be easily recessed into the existing wall cavity.

Arlington DBVR1C: For Recessed Vinyl Siding Boxes

The Arlington DBVR1C stands out because it allows the electrical box to sit flush or even slightly recessed within the vinyl siding. This eliminates the “bumpy” look of fixtures sticking out several inches from the wall, providing a streamlined, high-end appearance.

Designed specifically for vinyl siding, this mount features a telescoping box that adjusts to match the thickness of the siding. This creates a superior weather-tight seal that is difficult to replicate with standard flat mounting plates.

On jobs where aesthetics are a priority, such as high-end residential renovations, this plate is the go-to choice. Always check the siding manufacturer’s warranty, as some require specific mounting techniques to maintain the integrity of the weather barrier.

Eaton NP2020: Heavy-Duty Commercial Grade Panel

When the application demands extreme durability, the Eaton NP2020 delivers the structural integrity required for commercial or heavy-duty residential setups. It is constructed from high-grade, non-conductive polymers that resist impact and extreme temperature fluctuations.

This mounting plate excels in environments prone to high winds or extreme weather where standard boxes might flex. Its rigid design prevents the “oil-canning” or distortion often seen in cheaper plastic mounts under heavy load.

For installations involving heavy floodlights or large electrical conduit runs, the NP2020 is the professional choice. Pair it with appropriate high-strength fasteners to ensure the mount remains anchored firmly to the exterior sheathing.

Sigma Electric 14250: The Easiest Install Block

The Sigma Electric 14250 is favored on job sites where speed and efficiency are paramount. Its design minimizes the number of parts needed to reach a finished install, which reduces the chance of missing hardware or alignment issues.

The block is lightweight yet resilient enough to handle standard residential electrical loads. It is particularly effective for retrofitting fixtures onto existing homes where the siding is already installed.

While it is exceptionally easy to work with, it does not offer the same level of adjustability as the Arlington universal kits. It is best suited for standard flat-lap siding where the mounting surface is consistent and predictable.

Arlington 8081F: Best for Mounting Large Fixtures

The Arlington 8081F is the heavy lifter of the lineup, specifically engineered to support the weight of substantial exterior light fixtures. Its wider surface area distributes weight across a larger section of the siding, preventing the localized stress that leads to cracking.

This block is essential when dealing with decorative, heavy-duty lanterns or large cameras that place significant torque on the mounting point. The robust construction prevents the fixture from sagging over time.

When installing, verify that the mounting holes align with the blocking behind the siding to guarantee a solid connection. Failing to anchor into the wall framing can lead to a failed install, regardless of how strong the mounting plate itself is.

Choosing a Mount: Vinyl Stucco and Brick Jobs

Matching the mount to the substrate is the most critical step in ensuring long-term success. Vinyl siding requires a mounting block that integrates with the existing J-channel to maintain the integrity of the building envelope.

Stucco and brick jobs, however, require a different approach. You must ensure the mount sits flush against the masonry and that the gap between the plate and the brick is filled with a high-grade exterior sealant.

Avoid over-tightening fasteners into brick or stone, as this can crack the masonry face. Use appropriate masonry anchors and a drill bit sized exactly for the fastener to prevent unnecessary damage to the wall surface.

How to Properly Seal Your New Outdoor Mount Plate

A mounting plate is only as good as the seal between it and the building. Even the best non-conductive block will allow moisture infiltration if the perimeter is not properly caulked.

Always use a high-quality, paintable silicone or polyurethane sealant specifically designed for exterior use. Apply a continuous bead around the top and sides of the mount, leaving the bottom open so that any moisture that manages to get behind the block has a path to escape.

Never bridge the entire perimeter with caulk, as this creates a “bathtub effect” that traps water inside the wall. Proper drainage is the secret to preventing mold and wood rot behind electrical mounts.

Load Ratings: Will Your Mounting Plate Hold Up?

Load ratings are often ignored, but they determine the longevity of the installation. A standard plastic mount might support a small LED floodlight, but it will likely fail under the weight of a heavy decorative lantern or a long-arm security camera.

Consult the manufacturer’s spec sheet for the maximum weight limit before beginning the install. If the fixture exceeds the weight rating of the plate, add secondary support blocks or utilize a heavier-duty mounting system.

Remember that wind loading—the force of air pushing against a fixture—significantly increases the effective weight of the object. In high-wind coastal zones, choose a mounting plate with a higher load rating than the weight of the fixture alone.

Outdoor Electrical Mounts and the NEC: A Guide

The National Electrical Code (NEC) provides clear mandates for the installation of electrical equipment in damp or wet locations. All mounting plates and boxes must be listed for the intended use and installed in a manner that keeps the wiring system dry.

Code requires that all connections be housed in a weather-resistant box and that the cover plates provide a watertight seal. This is not just about passing an inspection; it is about preventing ground faults and short circuits that can lead to fires or electrocution.

Always adhere to the specific local amendments that may exist in a jurisdiction. If in doubt about a specific installation requirement regarding grounding or box fill, consult a licensed electrician or the local building official.

Selecting the right non-conductive mounting plate requires balancing the specific demands of the wall surface with the weight of the electrical fixture being installed. By prioritizing high-quality materials and proper sealing techniques, you ensure that the electrical system remains protected from the elements for years to come. Focus on proper anchoring and drainage, and the installation will stand the test of time.