GE Spec Setter Generator Interlock Kit & Inlet Wiring Guide
Connecting a 240V portable generator inlet (NEMA 14-50, L14-30, 14-30, or 6-50) to a GE Spec Setter load center requires a mechanical interlock plate matched to the main breaker layout (THQMV200), a listed THQB 2-pole backfeed breaker, and a mechanical breaker hold-down retainer per NEC 408.36(D).
By Gil Sapir, Editor
Fast Answer⚡ Interlock Reference: GE Spec Setter Load Centers▼
Mechanical Interlock Kit (THQMV200) + THQB Backfeed Breaker
30A or 50A Double-Pole THQB Breaker • 6 AWG THHN Cu (50A Inlet) or 10 AWG Cu (30A Inlet)
Compatible Generator Inlet Configurations for GE Spec Setter
Comparison of NEMA 14-50, 14-30, 6-50, and L14-30 generator inlets when wired to a GE Spec Setter load center.
| Generator Inlet | Max Breaker / Amps | Continuous Load (80%) | Max Running Watts | Copper Wire Gauge | Pin Configuration |
|---|---|---|---|---|---|
| NEMA 14-50 (240V) | 50A 2-Pole (THQB) | 40A | 12,000 W peak | 6 AWG Cu (THHN) | 4-wire RV/Generator Inlet |
| NEMA 14-30 (240V) | 30A 2-Pole (THQB) | 24A | 7,200 W peak | 10 AWG Cu (THHN) | 4-wire Dryer/Generator Inlet |
| NEMA 6-50 (240V) | 50A 2-Pole (THQB) | 40A | 12,000 W peak | 6 AWG Cu (THHN) | 3-wire Welder/Generator Inlet |
| NEMA L14-30 (240V) | 30A 2-Pole (THQB) | 24A | 7,200 W peak | 10 AWG Cu (THHN) | 4-wire Twist-Lock Generator Inlet |
GE Spec Setter Load Center Configurations & Interlock Reference Matrix
All 10 GE Spec Setter panel variants, main bus ratings, branch breaker types, and interlock kit references.
| Panel Configuration | Main Rating | Branch Breaker Type | Interlock Reference Model |
|---|---|---|---|
| General Electric Spec Setter Commercial 200A | 200A | Type THQB | THQMV200 |
| General Electric Spec Setter Commercial 100A | 100A | Type THQB | THQMV100 |
| General Electric Spec Setter Commercial 125A | 125A | Type THQB | THQMV100 |
| General Electric Spec Setter Commercial 150A | 150A | Type THQB | THQMV200 |
| General Electric Spec Setter Commercial 200A | 200A | Type THQB | THQMV200 |
| General Electric Spec Setter Commercial 225A | 225A | Type THQB | THQMV200 |
| General Electric Spec Setter Industrial 100A | 100A | Type THQB | THQMV100 |
| General Electric Spec Setter Industrial 200A | 200A | Type THQB | THQMV200 |
| General Electric Spec Setter Outdoor 100A | 100A | Type THQB | THQMV100 |
| General Electric Spec Setter 42-Space 200A | 200A | Type THQB | THQMV200 |
Generator NEMA 14-50 Inlet → General Electric Spec Setter Commercial 200A Panel Wiring
Required Hardware Checklist for GE Spec Setter
🔧 Mechanical Interlock Kit (THQMV200)
Matched to GE Spec Setter main-to-branch breaker spacing. Physically prevents turning on the generator backfeed breaker while the main utility breaker is closed.
Check Retailer Availability on Amazon🔌 Outdoor Generator Power Inlet Box (30A / 50A)
NEMA 3R weatherproof generator inlet box (NEMA 14-50 / CS6365 for 50A or NEMA L14-30 for 30A) wired to a listed 2-pole THQB backfeed breaker with hold-down kit.
Check Inlet Box Availability on AmazonRequired Wiring & Installation Accessories
50A Double-Pole Circuit Breaker
UL-Listed, mandatory for continuous EV charging load under NEC code.
6 AWG THHN Copper Wire (50ft Spool)
Heat-resistant 90°C copper conductor for conduit installation.
Hubbell HBL9450A / Bryant Electric 50A Industrial NEMA 14-50 Outlet
Industrial Grade heavy-duty receptacle (Hubbell HBL9450A / Bryant 50A). Mandatory safety upgrade to prevent melting on high continuous EV loads.
3/4" Schedule 40 PVC Conduit (10ft Lengths)
UV-resistant protection for exposed indoor/outdoor wire runs.
Generator Interlock Guides for Other Panel Lines
View NEC Article 702 interlock compatibility across other residential load center series:
Interlock Compatibility FAQ: GE Spec Setter
Is a mechanical generator interlock kit compliant with NEC code for GE Spec Setter panels?
Yes. Per NEC Article 702.5, a listed mechanical interlock plate physically prevents both the main utility breaker and the generator backfeed breaker from being turned on simultaneously in a GE Spec Setter load center, and NEC 408.36(D) requires a mechanical hold-down retainer on the backfed plug-on breaker.
What size wire and breaker are required for a 50A or 30A generator inlet on a GE Spec Setter panel?
A 50A generator inlet (NEMA 14-50 or CS6365) requires a 50A double-pole THQB-type breaker with 6 AWG THHN copper wire in conduit (or 6/3 NM-B where permitted). A 30A generator inlet (NEMA L14-30 or 14-30) requires a 30A double-pole THQB-type breaker with 10 AWG copper wire.
Which GE Spec Setter panel ratings are covered on this page?
This guide covers all 10 residential GE Spec Setter configurations, including Spec Setter Commercial 200A, Spec Setter Commercial 100A, Spec Setter Commercial 125A, Spec Setter Commercial 150A, Spec Setter Commercial 200A, Spec Setter Commercial 225A, Spec Setter Industrial 100A, Spec Setter Industrial 200A, Spec Setter Outdoor 100A, Spec Setter 42-Space 200A, using THQB branch breakers and reference interlock kit THQMV200.