22 Installation Guide APC Silcon 240-320kW 480V UPS
990-4049
External Connection
4.1.6 Connection Terminals
Terminals – 480V
The terminals for the control & alarm cables are screw clamps for cable size AWG18 to AWG14.
All other terminals are stud terminals.
4.1.7 Torque Specifications
4.1.8 Grounding
4.1.8.1 System Grounding
If no UPS neutral inputs are connected to a grounded service neutral conductor according to
local NEC code reguirements, provisions must be made as follows:
a) Bonding jumper must be mounted between output terminals X005:N and X005:E
b) Output terminal X500:E, marked “Grounding electrode terminal”, must be connected by
grounding electrode conductor to a local grounding electrode according to NEC 250-26
4.1.8.2 Equipment Grounding
Terminals marked intended for equipment grounding.
Provisions must be made as follows:
Input equipment ground terminal(s) must be connected to grounding electrode(s) provided for
the service entrance(s)
Terminal
Type
Input
stud size
Battery
stud size
Output
stud size
PE
stud size
System earth
stud size
240kW M12 M12 M12 M10 M12
320kW M12 M12 M12 M10 M12
Stud size M6 M8 M10 M12
Torque 66/7.5 lb-in/Nm 133/15 lb-in/Nm 266/30 lb-in/Nm 443/50 lb-in/Nm