<h2>Overview</h2>
<p>The <strong>Leviton 278 NEMA 14-30R</strong> is a heavy-duty, industrial-grade flush-mount receptacle rated for 30 amperes at 125/250 volts. This 3-pole, 4-wire grounding device is purpose-built for applications requiring robust electrical connections, including electric dryers, transfer switches, and industrial equipment. The side-wired configuration and steel strap mounting provide secure installation in residential and commercial settings.</p>
<h2>Key Features</h2>
<ul>
<li><strong>Heavy-gauge double-wire copper alloy contacts</strong> — deliver superior conductivity and durability in high-current applications</li>
<li><strong>Durable thermoplastic body</strong> — built to resist wear and environmental stress</li>
<li><strong>ID-marked terminals</strong> — brass, silver, and green screw identification ensures fast, accurate wiring</li>
<li><strong>Side-wired design</strong> — accommodates up to 4 AWG copper or aluminum conductors for flexible installation</li>
<li><strong>Steel strap mounting</strong> — included hardware simplifies installation and secures the receptacle in standard wallboxes</li>
<li><strong>Straight-blade configuration</strong> — compatible with standard NEMA 14-30R plugs</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Current Rating:</strong> 30 A</li>
<li><strong>Voltage Rating:</strong> 125/250 VAC</li>
<li><strong>NEMA Configuration:</strong> 14-30R</li>
<li><strong>Mounting Style:</strong> Flush Mount</li>
<li><strong>Poles/Wires:</strong> 3 Pole, 4 Wire</li>
<li><strong>Grounding:</strong> Yes (grounding conductor)</li>
<li><strong>Termination:</strong> Side Wired</li>
<li><strong>Terminal Accommodation:</strong> Up to 4 AWG</li>
<li><strong>Conductor Type:</strong> Copper or aluminum</li>
<li><strong>Body Material:</strong> Thermoplastic nylon</li>
<li><strong>Contacts:</strong> Heavy-gauge brass double-wipe</li>
<li><strong>Color:</strong> Black</li>
<li><strong>Wallplate Fit:</strong> Fits 2.15" diameter center hole</li>
</ul>
<h2>Typical Applications</h2>
<p>The Leviton 278 is widely used in:</p>
<ul>
<li>Residential electric dryer connections</li>
<li>Heavy-duty heating and cooling equipment</li>
<li>Industrial and commercial power distribution</li>
<li>Transfer switches and backup power systems</li>
<li>Workshop and garage 240-volt outlets</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li>NEMA 14-30P straight-blade plugs</li>
<li>Standard electrical wallplates with 2.15" center hole diameter</li>
<li>Dual-voltage 240V circuits (125/250V nominal)</li>
<li>Electrical systems rated for 30A service at 125/250V</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li>Leviton 55054 (surface-mount equivalent — verify mounting requirements before substituting)</li>
<li>Other NEMA 14-30R flush-mount receptacles with side-wired 4 AWG terminal accommodation</li>
</ul>
<h3>Works With</h3>
<ul>
<li>Standard electrical conduit and wiring practices (NEC compliant)</li>
<li>Copper and aluminum branch circuit conductors up to 4 AWG</li>
<li>30A rated circuit breakers and overcurrent protection devices</li>
</ul>
