T
he integral switch is a second mechanical means for qualified
maintenance personnel to isolate the entire surge suppressor to service
the device’s components. The integral switch opens the phase and neutral
connections to the SPD for additional protection.
Turn integral switch handle to the OFF position prior to opening the door of
the unit. With the handle in the OFF position, the SPD will be disconnected
from the circuit and the circuit will not be protected from surges.
Maintenance may now be performed on the SPD modules and associated
parts. Upon completion of repairs, close the door of the unit and turn the
handle to the ON position. Close the Panel Circuit Breaker or Primary
Disconnect to power SPD.
Install SPD’s on the load side of the main overcurrent protection to comply
with UL 1449 and the NEC.
Locate the SPD as close as possible to the circuit breaker being protected
to minimize the wire length and optimize SPD performance. Avoid long wire
runs so that the device will perform as intended. To reduce the impedance
that the wire displays to surge currents, the phase, neutral, and ground
conductors must be routed within the same conduit and tightly bundled or
twisted together to optimize device performance. Avoid sharp bends in the
conductors. See Figure 2.
Figure 2: Wiring Practice
W
ARNING
U
NDERSIZED WIRING
(USE ONLY CONDUCTORS RATED 30 A OR GREATER.)
· T
he SPD is designed for connection to a 30 A (or greater) circuit breaker.
· The circuit breaker is the intended disconnect means for the SPD without integral disconnect
option and provides over current protection for the connecting conductors.
· The circuit breaker maximum rating should not exceed the ampacity of the connecting conductors.
Failure to follow these instructions can result in death or serious injury.
LOCATION OF SPD
INTEGRAL SWITCH
Phase A
Phase B
Phase C
Ground
Neutral
Interconnect wiring
- Minimize length
- Avoid sharp bends
Phases
Neutral
Ground
Neutral bus
Ground bus
To "protected" load(s)
T
urn off all power supplying this equipment through the Panel Circuit
Breaker or Primary Disconnect before working on or inside the equipment.
ELECTRICAL
APC MODULAR PANEL PRODUCTS Surge Protective Device (SPD)
SPD
(4 pages)
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