Generac 00941-4 owner manual Isolating Different Power Sources, Power Supply Cord

Section 2 – Installation

IMPACT-36 plus II Recreational Vehicle Generator

•Wiring must be of adequate size, with approved insulative qualities, and properly supported.

•Conduit and wire openings into generator com- partment (if used) must be vapor-sealed, to pre- vent entry of flammable, explosive or poisonous gases into the vehicle.

◆2.6.1 WIRING

•Wiring should be of stranded copper to reduce chance that vibration may cause breakage.

•Wire gauge size of wires should be large enough to handle at least 115% of the installed generator's rated maximum current.

•If neutral conductors are used, they must be the same size as other leg wires.

•Route power supply conductors from generator DC output leads +DC (Red) and -DC (Blue), the return (Black) and the ground (Green) wire through approved flexible conduit, through the compart- ment floor and to the terminal block located in the DC junction box on the inverter. Refer to ANSI/RVIA standard EGS-1-1993 for conduit selection.

•If flexible metal conduit is used between the gener- ator and the compartment junction box, the con- duit end that terminates at the compartment junc- tion box must be vapor-sealed. Flexible metal con- duit is NOT vapor tight along its entire length.

•From the AC output junction box on the inverter, route the three wires T1 (Black), T2 (White), and the Green ground wire through approved flexible conduit to either (a) double-pole, double-throw transfer switch, or (b) approved isolation recepta- cle. Connecting to a transfer switch or isolation receptacle must prevent vehicle electrical circuits from being connected to two different power sup- plies at the same time (such as generator and dockside power).

•Conductors must be rated 221°F (105°C) or must be of a larger conductor size.

Figure 2.19 — Inverter J Box for AC Output

Circuit breaker protection is provided on the genera- tor and protects the unit against overload. Do not apply loads which exceed the rated wattage, or amperage capacity of the generator. Add the watts or amperes of all lighting, appliance, tool and motor loads that the generator will operate at one time. This total should be less than the units rated wattage/amperage capacity.

◆2.6.3 ISOLATING DIFFERENT POWER SOURCES

Conductors from the junction box must terminate in a double pole, double throw transfer switch (Figure 2.20). An alternate method for isolating different power sources is by using an isolating receptacle (Figure 2.21). Whichever method is used, be certain that both power sources are NOT connected at the same time.

◆2.6.4 POWER SUPPLY CORD

The power supply cord must comply with all applic- able codes, standards and regulations. It must be large enough to handle the full amperage to which it will be subjected.

◆2.6.2 GENERATOR AC CONNECTION SYSTEM

The Impact plus AC generator output is provided by the remote located inverter module. 120V AC is pro- vided from the terminal block located inside one of the J boxes on the inverter unit (Figure 2.19). The unit is provided with a ground which is connected to the generator and should be connected to the chassis of the recreational vehicle.

◆2.6.5 GROUND FAULT CIRCUIT INTERRUPTERS

The National Electric Code (NFPA 70, 551-7) requires installation of ground fault circuit inter- rupters (GFCIs) on all external and some internal electrical receptacles. Contact the dealer for recom- mendations.

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