Wiring Size & Installation Torque
With a parallel connection, the size of the wiring to the SPD is independent of the ampere rating of the circuit to be protected. The recommended wire size is based on the unit’s transient surge current capabilities. #6 AWG is the recommended wire size for phase, neutral and ground conductors.
Disconnect Switch
The PM Series is designed for connection to a 30A to 60A breaker. The PM3 and PM4 Series SPDs can be equipped with an optional internal disconnect switch (Figure 2). The disconnect switch provides a means to
The PML4Y/DC/DL is equipped with an internal disconnect switch with an external manual operator located on the exterior of the enclosure. Before opening the enclosure door the external manual operator must moved to the “OFF” position. This will
NOTE: A disconnect switch will add length, which increases the response time and the clamp voltage. To minimize the additional led length and optimize performance, units are available with an optional internal disconnect switch. The discon- nect switch is not a device that can be added to the unit after purchase. It must be ordered with the unit as the mounting cabinet is larger for units having the option.
If an internal disconnect switch is to be used, the location of the SPD and the disconnect switch should be planned out carefully to avoid excessive lead length when wiring the devices.
Figure 2: Basic PM Configuration with Disconnect Switch Option
(Daughterboard for Optional Surge Counter Shown)
VERIFY THAT ALL POWER
! WARNING CIRCUITS ARE
BEFORE MAKING CONNECTIONS
All electrical connections should be performed by a qualified (licensed) electrician.
All wiring must comply with the National Electrical Code (NEC) and applicable local codes.
**Surge Protective Devices are designed for use on the load side
of the service entrance disconnect only**
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