Master Lock MGH4000C, MGH3000PR Standby Installation to Home or Building, Generator Grounding

OWNER’S MANUAL

BATTERY

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FULL	POWER
O120NLY
	120
	240V
ENM
H00000005
OURS	1/10

TO ENGINE

BLOCK

TO STARTER

SOLENOID

ground wire to grounding point. You must supply the ground wire and grounding point. These do not come with generator. Follow the National Electrical Code and all state and local codes. Consult your power com- pany or a licensed electrician.

WARNING: For a grounding point, do not use metal pipe be- ing used to carry combustible materials or gases.

STANDBY INSTALLATION TO HOME OR BUILDING

WARNING: Have standby in- stallation performed by a skilled, licensed electrician. Do not let anyone else wire into a utility circuit. Personal injury, equip- ment damage, or damage to home could occur.

Figure 12 - Connecting Positive and Negative Cables to Battery (Model MGH7000C Shown)

TO

STARTER

SOLENOID

TO

ENGINE

BLOCK

Ground Lug

Copper or

Brass

Grounding

Point

Ground Wire

Alternator

Figure 14 - Grounding Generator (Model MGH4000C Shown)

IMPORTANT: This generator will not power your entire home. Most home utility electric service is more than 60 amps. This will exceed generator output. Only power needed items during a power outage. Make sure total wattage of electrical load does not exceed rated wattage of generator.

You may need to use this generator as a standby power source. During a power out- age, the generator will power selected items in a building. Have generator and additional wiring installed by a skilled, licensed elec- trician. This is not a do-it-yourself job. Fol- low all local codes.

Figure 13 - Connecting Positive and Negative Cables to Battery (Model MGH10000 Shown)

GENERATOR

GROUNDING

WARNING: You must prop- erly earth-ground generator be- fore starting. This will help guard against deadly electric shock. Only use grounded plugs with generator. Only use grounded ex- tension cords. Only use three- wire or double-insulated power tools.

Grounding generator helps prevent electric shock from a ground fault condition. Locate ground lug on end of generator housing (see Figure 12). Attach a #10 stranded-copper ground wire to ground lug. Drive grounding point into ground. Grounding point can be a stake, grounding rod, or pipe. Grounding point should be copper or brass. Attach

EXTENSION

CORDS

Only use grounded extension cords. Be sure to use extension cord with proper wire gauge size. See chart below.

Recommended Minimum Wire Gauges (AWG) for Extension Cords

Ampere	AWG for Length of
Load		Cord in Feet
	50'		100'	150'
2	18		18	18
3	18		18	18
4	16		16	16
5	16		16	16
6	16		16	14
8	16		14	12
10	16		14	12
12	14		14	12
14	14		12	10
16	12		12	10
20	10		10	8

WARNING: The electrician must install a double-throw trans- fer switch. This isolates existing electrical circuits from the utility power line. If not isolated, gen- erator output will back-feed into utility power line. This may elec- trocute a power company line repair person.

DETERMINING ELECTRICAL LOAD FOR GENERATOR

You must decide what electrical load your generator can power. Do this before using generator. Use the following four-step method. It will help you select a load that is not too large. Make sure total wattage of all electrical loads does not exceed rated watt- age of generator. For rated wattage of your generator, see Specifications, page 5. Elec- tric motors present a special problem when figuring load. Read Step 3 carefully.

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