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7
IO-70075
08/2020
ASCO 450/451/452/453 Surge Protective Device (SPD)
Electrical
Electrical
Service Clearance
Equipment Performance
Service clearance is needed at the front of the unit; 36 inches minimum is
the required distance for clearance pursuant to the NEC
To obtain the maximum system performance, locate the device as close
to the circuit being addressed as possible to minimize the interconnecting
wiring length. For every foot of wire length, approximately 160 Volts (6
kV / 3 kA, 8/20 microsecond) is added to the suppressed voltage. The
Voltage Protection Rating (VPR) is located on the device nameplate and is
measured six inches from the enclosure sidewall, according to UL® 1449
test standards.
Voltage Rating
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
•
Confirm the SPD voltage rating on the module or nameplate label is the
same as the operating voltage.
Failure to follow these instructions will result in death or serious injury.
Prior to mounting the SPD, verify that the device has the same voltage
rating as the power distribution system in which it is installed. Compare the
nameplate voltage or model number on the SPD with the nameplate of the
electrical distribution equipment.
The specifier or user of the device must be familiar with the configuration
and arrangement of the power distribution system in which any SPD is to
be installed. The system configuration of any power distribution system is
based strictly on how the secondary windings of the transformer supplying
the service entrance main or load are configured. This includes whether
or not the transformer windings are referenced to earth via a grounding
conductor. The system configuration is not based on how any specific load
or equipment is connected to a particular power distribution system. See
Table 1 for the service voltage of each SPD.
DANGER
