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10
Installation and Operation Manual
Terminals, Wire Size, and
Installation Torque
Terminals are provided for phase (line), neutral, and equipment ground
connections. The SPD terminals accept a range of 12 AWG (3 mm
2
) to 2 AWG
(34 mm
2
) copper wire for phase, neutral, and ground connectors. Torque
connections to the following values.
Branch Circuit Overcurrent
Protection and Disconnect Means
A branch circuit Overcurrent Protection Device (OCPD) either in the form of a
circuit breaker or fuse, must be provided for the SPD. The branch circuit OCPD
should either provide or include a disconnecting means.
Since the current drawn by the SPD during standby operation is negligible, the
SPD can be connected to a dedicated, separate branch circuit or connected to
a suitable existing branch circuit.
• When connected to a separate, dedicated branch circuit, the OCPD
setting must be selected to protect the conductors feeding the SPD.
• When connected to an existing branch circuit, the conductors connected
to the SPD must have an ampacity not less than the setting of the
existing OCPD. Refer to Terminals, Wire Size, and Installation Torque
section above, for the maximum conductor cross-section that can be
connected to the SPD.
During overvoltage surge diversion, current will flow through the SPD. The
branch circuit OCPD must pass this current without tripping for the SPD to
function properly.
For further information concerning coordination of the OCPD with the SPD,
refer to the Caution statement “Loss of Branch Circuit Power/Loss of Surge
Suppression” on page 4.
Table 3: Terminal Torque
Power Connection Torque
AØ, BØ, CØ and N
35 lb-in. (4 N•m)
Ground
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Use conductors rated for the Overcurrent Protection Device (OCPD) per
applicable codes.
• Use conductors rated for the application per applicable codes.
Failure to follow these instructions will result in death or serious injury.
Electrical