Location
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
Neutral bus |
Ground bus |
Panel |
Phase A |
Phase B |
Phase C |
Neutral |
Ground |
SPD |
Interconnect wiring
–Minimize length
–Avoid sharp bends
Installation and Operation Manual | 11 |
