Overview
The Bryant 4770NP locking plug is a heavy-duty NEMA L7-15P male connector rated for 15 amperes at 277V AC. Designed for secure, reliable connections in industrial and commercial environments, this plug features a twist-lock mechanism that prevents accidental disconnection during operation. The composite nylon housing in black and white provides impact and chemical resistance, making it suitable for demanding applications where equipment security and operational safety are critical.
Key Features
- NEMA L7-15P twist-lock configuration for secure, shake-proof connections
- 15A rated at 277V AC—ideal for three-phase and single-phase industrial circuits
- Screw terminals accommodate 14–10 AWG wire sizes for flexible installation
- 2-pole, 3-wire grounding design meets NEMA WD-1, NEMA WD-5, and UL 498 standards
- Impact and chemical-resistant nylon housing reduces maintenance and extends service life
- Operating temperature range -40°C to +60°C for indoor dry environments
Technical Specifications
| NEMA Configuration | L7-15P |
| Voltage Rating | 277V AC |
| Current Rating | 15 Amperes |
| Number of Poles | 2-Pole |
| Number of Wires | 3-Wire (including ground) |
| Connection Type | Screw Terminals |
| Wire Size Range | 14–10 AWG |
| Housing Material | Composite Nylon |
| Housing Color | Black and White |
| Grounding | Grounded (3-prong) |
| Operating Temperature | -40°C to +60°C |
| IP Rating | IP20 |
| Horsepower Rating | 2 HP |
| Standards Compliance | NEMA WD-1, NEMA WD-5, UL 498 |
| Mounting Type | Cord-Mounted |
Typical Applications
- Three-phase and single-phase industrial equipment in manufacturing plants
- Temporary power distribution at construction and event sites
- Fixed or portable equipment requiring shake-proof connections
- Data centers, laboratories, and commercial facilities with critical uptime needs
- Heavy machinery, compressors, pumps, and HVAC systems operating at 277V
Compatibility & Replacements
Compatible With
- NEMA L7-15R receptacles and twist-lock connectors
- Standard three-phase and single-phase 277V AC power distribution systems (North America)
- Equipment designed for L7-15P plug configuration (UL and CSA certified)
- Screw-terminal wiring chambers accepting 14–10 AWG conductors
Replaces / Drop-In Replacement For
- Leviton 4770-C (electrically and mechanically equivalent)
- Hubbell HBL4770C (direct equivalent)
- Other Bryant 4770NP plugs in damaged or failed units
Works With
- NEMA L7-15 twist-lock family (L7-15R receptacles, L7-15 connectors)
- 277V AC single-phase and three-phase industrial power systems
- Combination with weather boots and strain-relief accessories (Bryant-compatible)
- SO cord and standard industrial power cables (14–10 AWG)
