Allied Moulded FiberglassBox S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$13.15
Allied Moulded FiberglassBox Series Fiberglass Electrical Switch Box

Allied Moulded FiberglassBox Series Fiberglass Electrical Switch Box

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Model: 3303-NKV

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

$13.15
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Allied Moulded FiberglassBox Series Fiberglass Electrical Switch Box

The Allied Moulded FiberglassBox Series Electrical Switch Box is a non-metallic residential/receptacle enclosure molded from Fiberglass Reinforced Thermoset Polyester, engineered for reliable device mounting in residential and light commercial wiring applications. This family is available in 3-Gang (56.5 cu. in.) and 4-Gang (75 cu. in.) configurations, giving installers a range of interior volumes to accommodate device wiring and box fill requirements for multi-gang switch or receptacle installations. Molded from a durable fiberglass-reinforced thermoset polyester compound, every box in this series resists corrosion, moisture, and impact damage better than comparable metallic boxes, making it a dependable choice for new construction and remodel wiring where long-term durability is required. Each gang configuration allows electricians to consolidate multiple switches or receptacles into a single, code-ready enclosure, streamlining device layout and reducing the number of individual boxes needed on a wall.

Key Features

  • Gang Configurations: Available as 3-Gang (56.5 cu. in.) or 4-Gang (75 cu. in.) to match your device count and wall opening.
  • Interior Volume: Usable capacity scales with gang count to accommodate device wiring and box fill requirements for multi-gang installations.
  • Durable Construction: Fiberglass Reinforced Thermoset Polyester material resists corrosion, cracking, and moisture intrusion for long-service-life performance.
  • Multi-Gang Design: Supports mounting of multiple switches or receptacles within a single enclosure, reducing box count on a wall.
  • Application-Ready: Purpose-built as a Residential/Receptacle Electrical Switch Box for standard residential and light commercial wiring projects.
  • Non-Metallic Design: Fiberglass construction eliminates the need for grounding the box itself in many applications and provides added dielectric properties compared to metal boxes.

Technical Specifications

  • Product Type: Electrical Switch Box
  • Material: Fiberglass Reinforced Thermoset Polyester
  • Available Configurations: 3-Gang (56.5 Cu. In.), 4-Gang (75 Cu. In.)
  • Country of Origin: USA
  • Installation: New Work
  • Carton Quantity: 18

Typical Applications

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

Why Allied Moulded?

Allied Moulded's FiberglassBox series is built from Fiberglass Reinforced Thermoset Polyester to deliver a non-metallic alternative to traditional steel switch boxes, combining strength with resistance to corrosion and moisture. Offered in 3-Gang and 4-Gang configurations, this series gives electricians a practical, code-ready range of multi-device enclosures sized to the job at hand. Choose Allied Moulded for durable, purpose-built electrical boxes engineered for lasting field performance.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Electrical Switch Box
Configuration:
3-Gang
Department:
Electrical
Product Group:
Boxes & Enclosures
Product Subgroup:
Electrical Boxes
list_batch:
ALM-20260924
Product Material:
Fiberglass Reinforced Thermoset Polyester
Box Type:
Wall
Product Depth:
3 9/16 inches
Country of Origin:
United States
Installation:
New Work
Carton Quantity:
18
Product Height:
3 3/4 inches
Series:
FiberglassBox

Allied Moulded 3303-NKV – Frequently Asked Questions

1) Will an Allied Moulded FiberglassBox 3-gang switch box fit in a 2x4 stud wall?
Yes. The FiberglassBox wall box is listed at a 3 9/16 inch depth, which sits inside the 3-1/2 inch depth of a nominal 2x4 stud with the box face projecting to the drywall line, the normal way a new-work box is set. It is a wall-type box for new work, so it mounts to the stud before the wall board goes on.
2) Can I use the Allied Moulded FiberglassBox in an existing finished wall?
No. It is built for new work, meaning it fastens to framing during rough-in before drywall. For cutting into a finished wall you need an old-work (remodel) box that clamps to the wall board instead.
3) Do I have to ground a fiberglass electrical box?
The box body is Fiberglass Reinforced Thermoset Polyester, a non-conductive enclosure, so there is no metal shell to bond. The equipment grounding conductors still have to be spliced and carried to each device in the box.
4) Is a fiberglass box better than steel for a damp basement or garage wall?
For corrosion-prone locations the fiberglass thermoset polyester body is the reason to pick it over a steel box: it will not rust, and it resists moisture and impact. That is the main trade-off buyers make here, non-metallic durability instead of a metal box that needs bonding and can corrode.
5) What are the face dimensions of the FiberglassBox multi-gang box?
Height is listed at 3 3/4 inches with a 3 9/16 inch depth. Width follows the gang count, so the 3-gang and 4-gang differ in the horizontal run while the height and depth stay the same, which is why they set to the same stud depth and line up with standard multi-gang wall plates.
6) Can I gang three switches and a receptacle in one of these boxes?
That is what the multi-gang versions are for. The 4-gang (4304-NKV) takes four devices side by side in one enclosure, so a bank of switches plus a receptacle lands in a single box and a single four-gang plate instead of separate boxes. Choose the 3-gang (3303-NKV) for three devices.
7) How many Allied Moulded FiberglassBox switch boxes come in a carton?
Cartons are packed 18 boxes. Worth knowing if you are rough-in stocking a multi-unit job and want to order by full carton rather than piece.
How fast can I get the Allied Moulded 3303-NKV 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 3303-NKV come with a warranty?
Absolutely. The Allied Moulded 3303-NKV 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 3303-NKV?
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
Why buy the Allied Moulded 3303-NKV from ZenSupply?
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