IB01602078E
For more information visit: www.generac.com
Instruction Booklet
Effective: September 2011
Page
17
40-400A (480/600Vac) ATC-300+ 3-Postion
Contactor Based Transfer Switch
Table 4. Transfer Switch Equipment Wire Sizes
4.5 Wiring
WARNING
POWER CONDUCTORS AND CONTROL WIRING MAY HAVE VOLT-
AGE PRESENT THAT CAN CAUSE SEVERE PERSONAL INJURY OR
DEATH. DEENERGIZE ALL POWER OR CONTROL CIRCUIT CON-
DUCTORS BEFORE BEGINNING TO PERFORM ANY WIRING ACTIV-
ITY TO OR WITHIN THE ATS EQUIPMENT.
Power sources, load conductors, and control wiring should be
connected to locations as indicated in the Customer Wiring Book-
let supplied with the ATS equipment.
CAUTION
ENSURE THE ATS VOLTAGE IS SET CORRECTLY. IT SHOULD BE
THE SAME AS THE SOURCE 1 AND SOURCE 2 LINE VOLTAGES.
OPERATING THE EQUIPMENT ON IMPROPER VOLTAGE CAN
CAUSE EQUIPMENT DAMAGE.
Once the ATS equipment has been installed and wired, perform
the initial mechanical and electrical procedures as outlined in Sec-
tion 6 to verify that the equipment is installed and operating
properly.
4.6 Engine Start Connection
The engine control contact connections are located on the logic
panel of the ATS. Connect the engine start wires to the termi-
nals marked 13 and 14 on J-5 connector on the ATC-300+ Con-
troller (see Figure 12). A contact closes between these terminal
when an engine start signal is provided by the ATS logic. The
wiring diagram provides additional engine start connection infor-
mation. Use the proper wire size as listed by the generator set
(Genset) manufacturer.
NOTICE
PRIOR TO MAKING THE ENGINE START CONNECTION TO THE
SWITCH, SET THE ENGINE GENERATOR CONTROLS SELECTOR
SWITCH IN THE OFF POSITION TO PREVENT AN UNWANTED
ENGINE START. CONTROL WIRING, SUCH AS THE ENGINE START
WIRES, MUST BE RUN IN A SEPARATE CONDUIT FROM THE
POWER CABLES.
TRANSFER SWITCH AMPERE RATING
WIRE SIZE RANGES
NUMBER OF CABLES PER PHASE
TERMINAL TEMPERATURE RATING °C (°F)
100
#14-2/0
1
75 (167)
200
#6-250 KCMIL
1
75 (167)
320
#4-600 KCMIL or (2) 1/0-250 KCMIL
1 or 2 - depending on wire size used
75 (167)
400
#4-600 KCMIL or (2) 1/0-250 KCMIL
1 or 2 - depending on wire size used
75 (167)
