Product Manual B

3. Wiring5-2019

3.1 AC Connections

TABLE 1. TERMINAL LUG CAPACITY FOR COPPER OR ALUMINUM CONDUCTORS

Switch Current Rating Wires per Phase Size Range of Wires

40/70/125 (3-Pole) Source 1 12 AWG-2/0 Cu-Al

40/70/125 (3-Pole) Load &

Neutral

1 14 AWG-2/0 Cu-Al

40 Amp (4-Pole) 1 14 AWG-2/0 Cu-Al

70, 125 Amp (4-Pole) 1 6 AWG-300 MCM Cu-Al

150/225 1 6 AWG-300 MCM Cu-Al

260 1 6 AWG-400 MCM Cu-Al

300/400 2

3/0 AWG-250 MCM Cu-Al

3/0 AWG-600 MCM Cu-Al

600 2 250-500 MCM Cu-Al

800/1000 4 250-500 MCM Cu-Al

Perform wiring in the following sequence:

1. Test the operation of the generator set from its own controls.

2. Stop the generator set and remove the negative lead from the cranking battery to prevent starting.

WARNING

Failure to prevent the generator set from starting before wiring procedures are performed

presents a shock hazard that can cause severe personal injury or death. Disconnect

generator set battery (negative (-) terminal first) before proceeding.

3. Connect conductors of sufficient size (see contract drawings) to carry rated current from the line,

load, and generator set directly to the transfer switch terminals, which are marked A, B, and C (A, B,

C, and N on 4-pole switches). A neutral bar with lugs is standard on 3-pole switches. Phase rotation

must be the same on the utility and genset power sources.

4. On 120-volt switches, connect the hot side to the (A) lug and the neutral side to the Neutral lug. On

240-volt single phase switches, connect the two hot lines to the A- and C-lugs and the Neutral line to

the Neutral lug.

5. Connect power cables to the load terminals. Tighten the lugs as indicated in the following table:

TABLE 2. LUG TORQUES

Set Screw Socket Size (Across Flats) Minimum Torque For Proper Operation

3/16 In 80 In-lbs (9 N•m)

1/4 In 200 In-lbs (23 N•m)

5/16 In 275 In-lbs (31 N•m)

3/8 In 375 In-lbs (43 N•m)

1/2 In 500 In-lbs (57 N•m)