ELECTRICAL
SpikeShield
®
Non-Modular Surge Protective Device (SPD)
9
Hubbell Wiring Devices
1-800-729-3406 | www.Hubbell-Wiring.com
06/2010
8222-0507A
Integral Switch
The integral switch is a mechanical means for qualified electrical personnel to
isolate the entire surge suppressor to service the device’s components. The
switch opens the phase and neutral connections to the surge protective device.
The integral switch feature allows the SPD device to be isolated for service
without the necessity of interrupting power on the entire branch circuit. Turn
switch handle to the OFF (O) position prior to opening the door of the unit.
With the handle in the OFF (O) position, the SPD will be disconnected from
the circuit and the circuit will not have surge suppression. Once the absence
of voltage is verified, maintenance may now be performed inside the SPD
enclosure. Upon completion of repairs, close the door of the unit and turn
the handle to the ON (I) position.
Location of SPD
Install Type 2 SPDs on the load side of the main Overcurrent Protection
Device (OCPD) to comply with NEC Article 285 for Type 2 SPDs.
Locate the SPD as close as possible to the circuit being addressed 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:
SPD Wiring
To load(s)
Phases
Neutral
Ground
Ground bus
Neutral bus
SPD
Phase A
Phase B
Phase C
Neutral
Ground
Panel
Interconnect wiring
– Minimize length
– Avoid sharp bends