Allied Moulded P-643QT FlexBox...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$5.32
Allied Moulded P-643QT FlexBox Thermoplastic 3-Gang Electrical Switch Box

Allied Moulded P-643QT FlexBox Thermoplastic 3-Gang Electrical Switch Box

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Model: P-643QT

In Stock (leaves warehouse same day if ordered before 3pm ET)

$5.32
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Allied Moulded P-643QT FlexBox Thermoplastic 3-Gang Electrical Switch Box

The Allied Moulded P-643QT is a FlexBox® brand thermoplastic 3-gang residential/receptacle electrical switch box engineered for durable, code-compliant device installations in new construction and remodel wiring. Measuring 5-13/16-Inch x 3-3/4-Inch x 3-9/16-Inch with a generous 64-cubic-inch interior capacity, this box gives electricians ample room for wire management and multiple gang devices such as switches and receptacles. Molded from rugged thermoplastic, the P-643QT resists corrosion, cracking, and the effects of moisture better than many metallic alternatives, making it a dependable choice for residential and light commercial branch-circuit work. As part of the Allied Moulded FlexBox® product line, it is designed to integrate smoothly with standard electrical rough-in practices and common device configurations.

Key Features

  • Trade Configuration: 3-Gang residential/receptacle switch box for installing multiple switches or receptacles in a single opening.
  • Durable Construction: Molded thermoplastic body resists corrosion, moisture, and impact damage common to jobsite handling.
  • Dimensions: 5-13/16-Inch x 3-3/4-Inch x 3-9/16-Inch footprint sized for standard multi-gang wall openings.
  • Cubic Capacity: 64-Cubic-Inch interior volume provides ample room for conductor fill and device wiring per code fill requirements.
  • FlexBox® Design: Part of the Allied Moulded FlexBox® system, built for straightforward installation in residential wiring applications.
  • Non-Metallic Material: Thermoplastic construction eliminates the risk of rust or galvanic corrosion associated with metal boxes.

Technical Specifications

  • Product Type: 3-Gang Residential/Receptacle Electrical Switch Box
  • Material: Thermoplastic
  • Dimensions: 5-13/16-Inch x 3-3/4-Inch x 3-9/16-Inch
  • Cubic Capacity: 64-Cubic-Inch
  • Gang Configuration: 3-Gang
  • Product Line: FlexBox®

Typical Applications

  • Residential Switch and Receptacle Installations
  • Multi-Gang Wall Device Mounting
  • New Construction Electrical Rough-In
  • Remodel and Retrofit Wiring Projects
  • Light Commercial Branch-Circuit Wiring

Why Allied Moulded?

Allied Moulded's FlexBox® thermoplastic boxes are built to give electrical contractors a durable, corrosion-resistant alternative to traditional metallic boxes without sacrificing interior capacity or gang configuration options. The P-643QT's 64-cubic-inch volume and 3-gang design support code-compliant conductor fill for demanding residential and light commercial installations. Choosing thermoplastic construction from Allied Moulded means a lighter, non-corrosive box that stands up to the rigors of everyday electrical work.

Manufacturer Resources

Spec Sheet

Product Specs

list_batch:
ALM-20260924
Product Type:
Electrical Switch Box
Configuration:
3-Gang
Department:
Electrical
Product Group:
Boxes & Enclosures
Product Subgroup:
Electrical Boxes
Product Material:
Thermoplastic

Allied Moulded P-643QT – Frequently Asked Questions

1) Is 64 cubic inches enough box fill for three devices with 12 AWG conductors?
The Allied Moulded P-643QT gives you 64 cubic inches of interior volume across its three gangs, which is a large-capacity non-metallic box by 3-gang standards. Under NEC box fill math a 12 AWG conductor counts as 2.25 cubic inches and each yoke-mounted device counts as two conductors of the largest wire in the box, so three devices consume 13.5 cubic inches before any circuit conductors, grounds, or clamps. That leaves room for a substantial multi-wire rough-in, which is why this box gets specified where several switch legs and travelers land in one opening.
2) What are the dimensions of the P-643QT 3-gang box, and will it fit a standard multi-gang wall opening?
Measures 5-13/16 x 3-3/4 x 3-9/16 inches. That footprint is sized for a standard three-gang wall opening and the roughly 3-9/16 inch depth dimension is what drives the 64 cubic inch volume, so confirm your stud cavity and any insulation or firestopping can take a deep box before you set it.
3) Should I use a thermoplastic box like this or a metal 3-gang box?
Non-metallic is the usual choice on residential and light commercial branch circuits wired in NM cable: the thermoplastic body will not rust or corrode galvanically, and it needs no bonding of the box itself since the enclosure is not a conductor. Metal boxes are what you want where the wiring method is EMT or MC and the raceway carries the equipment ground, or where a jobsite spec calls for metallic enclosures. The P-643QT is the thermoplastic option, molded from a single piece with no seams to leak or split.
4) Can I use the P-643QT in a remodel, or is it new-construction only?
Both. Allied Moulded lists the P-643QT for new construction rough-in as well as remodel and retrofit wiring, plus multi-gang device mounting and light commercial branch circuits. Where you are working in a finished wall with no accessible framing, check that your mounting method suits the opening, since a new-work box is set to the framing member.
5) Can I mount three receptacles in this box, or is it only for switches?
Either. The three gangs take any combination of standard strap-mounted devices, switches, receptacles, dimmers, or blanks, which is why Allied Moulded classes it as a residential/receptacle switch box. Dimmers are the one to watch: they are physically bulkier and often require derating when ganged, so allow for that when you lay out three side by side.
6) What is the exact part number to order for the Allied Moulded 3-gang FlexBox?
Order it as P-643QT, an Allied Moulded FlexBox part. The P-643QT designation is the manufacturer part number, so it is what a distributor will cross-reference; the number itself covers the 3-gang, 64 cubic inch thermoplastic box.
7) Where do I get the manufacturer spec sheet for the P-643QT?
Allied Moulded publishes a PDF spec sheet for the P-643QT, available at https://media.distributordatasolutions.com/alliedmoulded_v2/2021q3/documents/f5fec492bd388c026e762bc57ae05869933306ea.pdf. That is the document to attach when a submittal package or an inspector wants the box volume and configuration on record.
How fast can I get the Allied Moulded P-643QT delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Allied Moulded P-643QT come with a warranty?
Absolutely. The Allied Moulded P-643QT is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Allied Moulded P-643QT?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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