Cooper Wiring Devices 15A 125V...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$13.16
Cooper Wiring Devices 15A 125V NEMA 5-15P Flanged Inlet, Black Nylon

Cooper Wiring Devices 15A 125V NEMA 5-15P Flanged Inlet, Black Nylon

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Model: 5278-C

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

$13.16
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Cooper Wiring Devices 15A 125V NEMA 5-15P Flanged Inlet, Black Nylon

The Cooper Wiring Devices Flanged Inlet is a two-pole, three-wire grounding power inlet built for reliable 15A, 125V connections. Configured to NEMA 5-15P, this flanged inlet features a durable black nylon housing with brass contacts and a corrosion-resistant design suited for demanding electrical environments. It is engineered to accept #14 AWG wire, making it a dependable choice for professional electricians and facility maintenance teams who need a rugged, code-compliant power connection point.

Key Features

  • NEMA Configuration: 5-15P configuration supports standard two-pole, three-wire grounding connections for common 15A, 125V equipment.
  • Durable Construction: Black nylon housing paired with brass contacts delivers strength and reliable conductivity in everyday use.
  • Design Type: Purpose-built flanged inlet design allows for clean, surface-mounted power connection points.
  • Electrical Rating: Rated 15A at 125V for compatibility with standard household and commercial circuits.
  • Wiring Capacity: Accepts #14 AWG wire for straightforward, code-compliant field termination.
  • Corrosion Resistant: Corrosion-resistant construction supports long-term performance and service life.
  • Grounding Design: Two-pole, three-wire grounding receptacle configuration for added safety on connected equipment.

Technical Specifications

  • Contact Material: Brass
  • Receptacle Type: Two-pole, three-wire, grounding
  • Material: Nylon
  • Voltage Rating: 125V
  • Color: Black
  • Number Of Poles: Two-pole
  • Number Of Wires: Three-wire
  • Allowable Wire Size: #14 AWG
  • Design Type: Flanged Inlet
  • Amperage Rating: 15A
  • Nema Configuration: 5-15P
  • Special Features: Corrosion resistant
  • Amperage Rating: 15A
  • list_batch: COOPER-20260730

Typical Applications

  • Power Inlet Connections for Cord-and-Plug Connected Equipment
  • Commercial and Industrial Electrical Installations
  • Facility and Equipment Power Connection Points
  • Renovation and New Construction Wiring Projects
  • Panel and Enclosure-Mounted Power Inlets

Why Cooper Wiring Devices?

Cooper Wiring Devices builds this Flanged Inlet with a durable black nylon housing and brass contacts, combining corrosion resistance with dependable two-pole, three-wire grounding performance. The 15A, 125V rating and NEMA 5-15P configuration make it a practical, code-compliant choice for professionals who need consistent, long-lasting power connections in demanding commercial and industrial settings.

Manufacturer Resources

Product Specs

Contact Material:
Brass
Receptacle Type:
Two-pole, three-wire, grounding
Voltage Rating:
125V
Number Of Poles:
Two-pole
Number Of Wires:
Three-wire
Allowable Wire Size:
#14 AWG
Design Type:
Flanged Inlet
Amperage Rating:
15A
Nema Configuration:
5-15P
Special Features:
Corrosion resistant
Product Type:
Flanged Inlet
Product Material:
Nylon
Product Color:
Black
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Plugs & Connectors

Cooper Wiring Devices 5278-C – Frequently Asked Questions

1) What is a flanged inlet and when do I use one instead of a regular receptacle?
A flanged inlet is a male power connection point mounted into a panel, enclosure, or equipment wall. The pins face out, so you bring power TO the equipment with a cord set ending in a female connector. The Cooper Wiring Devices 5278-C is the 15A, 125V version in NEMA 5-15P. Use it when the equipment needs to be fed by a cord rather than hardwired, like a skid-mounted unit, a generator-fed panel inlet, or a piece of gear that gets disconnected and moved. A standard receptacle is the opposite polarity of connection and will not mate with a cord cap.
2) Will a standard extension cord or power cord plug into the Cooper 5278-C inlet?
Yes, as long as the cord end is a NEMA 5-15 connector body (the female end, sometimes called a cord connector or a 5-15R in-line). The 5278-C is configured 5-15P, so it presents blades, and any 15A 125V three-wire grounding cord cap in that configuration will mate with it. The everyday three-prong cord on standard equipment is exactly that configuration. What will NOT work is a 5-20 twist-lock or a locking connector; those are different configurations entirely.
3) What size wire can I land on the Cooper 5278-C flanged inlet terminals?
The terminals take #14 AWG. That matches a 15A branch circuit, which is what #14 copper is rated for under normal conditions. If your feed is #12 because the circuit was run for 20A or for a long pull, the 5278-C is not the right device to land it on, both because of the terminal capacity and because a 15A inlet does not belong on a 20A circuit unless the rest of the design supports it.
4) Does the Cooper 5278-C work on a 20 amp circuit or with 20 amp equipment?
No. It is a 15A device in the 5-15P configuration. Equipment drawing 20A needs a 5-20 inlet, and its cord cap will not mate with a 5-15 inlet anyway. If the load is genuinely 15A or less, the 5278-C is correct even where the branch circuit is 20A and the rest of the installation is designed for that. If the load is above 15A, this is the wrong part.
5) How many conductors do I need to run to the Cooper 5278-C?
Three: hot, neutral, and equipment ground. The 5278-C is a two-pole, three-wire grounding device, so it is a straight 125V single-phase connection with a dedicated ground path to the connected equipment. There is no provision for a second hot leg, so it is not a candidate for 250V or for a shared-neutral multiwire arrangement on the load side.
6) Can I use this Cooper flanged inlet on equipment in a damp or washdown area?
The 5278-C body is nylon with brass contacts and is built corrosion resistant, which is why it holds up better than a general-purpose thermoplastic device around moisture and chemical exposure. That covers the device itself. It does not carry its own enclosure, so in a wet or damp location the protection has to come from the cover plate or enclosure you mount it in. Spec the cover for the location and the inlet will keep up with it.
7) I need to standardize power inlets across a facility. Is the 5278-C the same device on every order?
It is a single-configuration part: one model, 5278-C, black nylon, 15A 125V, NEMA 5-15P. There is no finish or amperage option to get wrong on a reorder, so repeat purchases land identically. For a maintenance stock that means one line item covers every 125V cord-fed inlet point you have standardized on.
8) Are the contacts on the Cooper 5278-C brass or plated steel?
Brass. That matters on an inlet more than on a fixed receptacle, because the blades are exposed on the outside of the panel and get plugged and unplugged repeatedly. Brass holds conductivity and resists the surface corrosion that raises contact resistance and heats a connection over time. Paired with the corrosion-resistant nylon body, it is the combination you want where the inlet sees regular cycling.
9) What color is the Cooper 5278-C and does it come in other colors?
Black only. Cooper builds the 5278-C in black nylon, and there is no alternate color under that model number. On industrial gear and enclosure faces black is the usual choice anyway, but if a job spec calls out a specific device color, the 5278-C will not satisfy it.
How fast can I get the Cooper Wiring Devices 5278-C 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 Cooper Wiring Devices 5278-C come with a warranty?
Absolutely. The Cooper Wiring Devices 5278-C 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 Cooper Wiring Devices 5278-C?
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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