The Arlington 3103 is an NM cable fitting built to thread, terminate, and adapt rigid metal or IMC conduit runs. Specified by industrial electricians, service-entrance installers and stocked in Canada by Maple Electric Supply for fast contractor and project delivery.
Manufacturer spec sheet: Download the official Arlington spec sheet (PDF) ↗
TL;DR
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What it is: Arlington 3103, NM cable fitting, 1-1/4" trade size.
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Best for: residential nmd90 installs, multi-family wood-frame.
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Why this one: Heavy zinc and aluminum bodies built for the toughest commercial and industrial duty.
Quick Specs
Quick reference for the 3103: 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: 3103
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Family: NM Cable Fittings and Supports
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Trade size: 1-1/4"
Best For
Common scopes where the Arlington 3103 (and the rest of the NM Cable Fittings and Supports 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.
- Residential NMD90 installs
- Multi-family wood-frame
- Metal-stud commercial with NM through-bores
- Solar PV interior runs
Why Contractors Choose It
- Listed for the applications stated on the Arlington spec sheet, so there are no jurisdictional surprises at inspection.
- Cable retention and box-entry geometry sized for NMD90 and equivalent jackets, with no over-tightening and no jacket damage during the pull.
- 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. The same part number you've already spec'd on prior jobs, with the same listings.
- Replacement and add-on units are available through a Canadian supply channel, so short-notice job sites can pull additional stock without re-engineering the order.
Choose the Right Model
Compare with sibling Arlington NM cable fittings:
See: Arlington NM Cable Fittings and Supports collection
Installation Notes
- NMD90 cables must be supported every 1.5 m and within 300 mm of each box per CEC 12-510. Connectors must be listed for non-metallic cable.
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Primary code reference: CEC Section 12-500 (Non-Metallic Sheathed Cable NMD90); CEC 12-510 (Support Requirements).
- 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 NM Cable Fittings and Supports line. Most of them are small, and all are avoidable when the right SKU and accessory get pulled at the counter.
- Skipping the stud bushing through metal
- Exceeding the cable count per fitting
- Using a plastic fitting where steel is required for grounding
- Forgetting cable supports every 1.5m (CEC 12-510)
Frequently Bought With
- Arlington Flex AC MC Fittings
- Arlington Liquid Tight Fittings
- Arlington Miscellaneous (cable supports)
Sourcing in Ontario
The Arlington 3103 is part of Maple Electric Supply's stocking program. Orders for in-stock SKUs ship same-day from our Ontario warehouse. Larger project quantities can be quoted with contractor pricing; we pull from Arlington's North American inventory pool directly, not through a US re-shipper, so the NM cable fitting reaches the job without customs paperwork on your end.
Frequently Asked Questions
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Is the Arlington 3103 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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What NMD90 cable size does this fit?
Varies by configuration. Check the 3103 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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Push-in, screw-clamp, or 2-piece?
The 3103 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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Plastic or metal body?
Confirm against the published Arlington 3103 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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Listed for use through metal studs (stud bushing)?
Maple Electric Supply can pull the 3103 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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How many cables per fitting?
Refer to the 3103 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.
Buy Arlington NM cable fittings from a Canadian distributor. Maple Electric Supply ships from Ontario stock; technical support included.
