WIRING CONNECTORS FOR ELECTRIC GENERATORS

 

The generic standard for AC power connectors in North America is ANSI/NEMA WD 6-2012. Generator outlets It defines believe it or not, about 150 different styles. That’s why wiring the plugs or cords may be confusing to the users. Luckily, only a handful of outlet types are practically used in portable generators. Usually, in addition to conventional 120V outlets they provide one or several different high-current receptacles. Above image shows as an example the receptacles used in 10kW Duromax XP10000. The chart below provides wiring configurations of common single-phase generator outlets and plugs.

CONNECTOR DESCRIPTIONNEMA P/NWIRE SIZE
(AWG)		DIAGRAMS
Three-pole 120/240V 20A lockingL14-2012 Connector L14-20 diagram
Two-pole 120V 30A lockingL5-3010 L5-30 diagram
Three-pole 120V/240V 30A lockingL14-3010 Diagram of L14-30 outlet and plug
Two-pole 120V 30A RV styleTT-30 (RV30)10 Diagram of TT-30 outlet and plug
Three-pole 120/240 50A non-locking14-506 Diagram of NEMA 14-50 outlet and plug

Notes:

1. In the above diagrams X and Y- electrically hot wires (usually red and black), W – neutral (white), G- ground (green).

2. Plugs and outlets are shown in front view (pin side).

3. Wire sizes are approximate. You need to take into account the temperature and the length of the cable.

4.The extension cables are used only in portables for temporary use. Standby home generators are normally hooked up to a transfer panel, which is connected permanently to the house wiring.