The Arlington NMUF50 is an InBox weatherproof box built to secure, support, or terminate NMD90 (Romex / Loomex) cable through studs, boxes, and panels. Specified by residential electricians, builders and stocked in Canada by Maple Electric Supply for fast contractor and project delivery.
Manufacturer resources: Browse Arlington's official Conduit Bodies catalog ↗ for full technical specifications, dimensional drawings, and installation guides.
TL;DR
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What it is: Arlington NMUF50, InBox weatherproof box, 1/2" trade size.
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Best for: exterior duplex receptacles, holiday-light feeds.
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Why this one: Push-in connectors and stud bushings save time on every drop, with no screws or callbacks needed.
Quick Specs
Quick reference for the NMUF50, the points contractors and purchasers check first when matching a part to a project drawing or a takeoff line. Full installation and listing detail lives on the Arlington spec sheet.
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Arlington part number: NMUF50
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Family: INBOX Weatherproof Boxes
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Sub-type: Recessed weatherproof box (vertical)
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Trade size: 1/2"
Best For
Common scopes where the Arlington NMUF50 (and the rest of the INBOX Weatherproof Boxes line) earns its place on the spec. Not an exhaustive list, but a fast read on whether this is the right family for your application before you go deeper on the cut sheet.
- Exterior duplex receptacles
- Holiday-light feeds
- Hose-bib heat trace
- Outdoor camera power
Why Contractors Choose It
- Listed for the applications stated on the Arlington spec sheet, so there are no jurisdictional surprises at inspection.
- Pre-assembled in-use weatherproof package that gets a wet-location receptacle to rough-in faster than building it from a box, gasket, and cover SKU-by-SKU.
- Distributed by a Canadian-owned stocking dealer. Maple Electric Supply ships from Ontario, so the SKU lands on site without cross-border duty calcs or week-long customs holds.
- Backed by Arlington's North American manufacturing footprint. It's the same part number you've already spec'd on prior jobs, with the same listings.
- Replacement and add-on availability through a Canadian supply channel means short-notice job sites can pull additional units without re-engineering the order.
Choose the Right Model
Compare with sibling Arlington InBox weatherproof boxes:
See: Arlington INBOX Weatherproof Boxes collection
Installation Notes
- Outdoor receptacles in wet locations must use an extra-duty in-use cover per CEC 26-704. INBOX recessed boxes provide weather-tight protection when mounted to manufacturer specs.
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Primary code reference: CEC Section 26-700 (Wet Locations); CEC 2-300 (Equipment for Specific Use).
- Verify the Arlington listing on the current spec sheet matches your local AHJ's adopted code edition. Provincial amendments to the CEC can override the federal base text.
- Confirm trade size, mounting style, and accessory pairing against the project drawings before ordering in volume. Maple Electric Supply's counter staff can pull the cut sheet on request.
- Installation must be completed by a qualified electrician where required by local code; the homeowner / unlicensed scope is narrower in Ontario than in several US jurisdictions.
Common Mistakes to Avoid
Patterns we see on returns, callbacks, and inspection re-visits around the INBOX Weatherproof Boxes line, most of them small and all of them avoidable when the right SKU and accessory get pulled at the counter.
- Skipping the in-use cover (CEC 26-704)
- Mounting AFTER siding goes on (should be before)
- Choosing horizontal where vertical is required for cord clearance
- Painting the gasket along with the cover
Frequently Bought With
- Arlington Liquid Tight Fittings
- Arlington Siding Mounting Blocks
- Arlington Fan and Fixture Boxes
Sourcing in Ontario
For contractors specifying the Arlington NMUF50 on a project, Maple Electric Supply can confirm in-stock counts before you commit on the bid. That's useful when the install window is tight or the substitution clause in the spec is closed. Larger orders qualify for project pricing, and replacement SKUs ship from Ontario stock instead of waiting on a cross-border backorder.
Frequently Asked Questions
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Is the Arlington NMUF50 UL and/or CSA listed?
Arlington components are listed for the applications stated by the manufacturer. Always verify the listing on the product's spec sheet against your jurisdiction's adopted code.
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Is this part made in the USA?
Arlington Industries manufactures the bulk of its catalog in the United States. Confirm origin on the current spec sheet if it matters for your project.
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New construction or retrofit?
Varies by configuration. Check the NMUF50 datasheet for the exact dimensions, ratings, and accessory list before ordering in volume. Arlington updates spec sheets periodically, so spec the live version from the manufacturer's site for the current job.
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Vertical or horizontal mount?
The NMUF50 datasheet is the authoritative source on this. Arlington publishes torque specs, listed conductor ranges, and accepted accessories per part number, and those values shift between revisions even when the SKU stays the same.
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What siding type is this compatible with (lap, Dutch lap, brick, stucco)?
Confirm against the published Arlington NMUF50 cut sheet; values shift between configurations even inside the same family. Maple Electric Supply can email a current copy on request and flag any recent revisions that changed listed ratings.
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Does it meet CEC 26-700 wet-location requirements?
Maple Electric Supply can pull the NMUF50 spec sheet on request. Answers here depend on the specific configuration and the listed conditions of use. Anything that affects code compliance should come straight from the manufacturer's current published documentation.
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Is an in-use cover included or separate?
Refer to the NMUF50 product page on Arlington's site or contact Maple Electric Supply for a copy of the current spec sheet with all listed ratings. Generic family-level guidance is a starting point, but the SKU-level sheet is what the inspector will reference.
Stocked in Canada by Maple Electric Supply. Contractor support, bulk pricing on request, local pickup and delivery available.
