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XT-40 & IT-RSS Installation IM01005012E
Rev. 1 – 2/2007 Page 5
2.3 IT-RSS Wiring Diagram
Split Phase – 288 Vac Phase to Phase Max.
IT-RSS
CIRCUIT
INTERRUP
T
DEVICE
PHASE A
GROUND
PHASE B
2.4 Installing Circuit Interrupt Devices
The SPD must be connected to the electrical system through a 30 A circuit interrupt device as listed in
Table 2-1. The circuit interrupt device can consist of fuses, individual circuit breakers (single breaker for
each phase), or a multi-pole / single throw breaker.
A pre-existing breaker of rated load size may be utilized if provisions for multi-conductor connections are
made according to U.S. NEC 110-14a (or other applicable country codes). Avoid using a pre-existing
breaker that when operated will cause a critical system shut down.
For XT-40 Single Phase applications (refer to Section 2.2, Single Phase Diagram), note that if the Neutral
wire is used as Phase B, then an additional interrupt device must be used for that phase.
Table 2-1. Wire and Circuit Interrupt Device Requirements
Circuit Interrupt Device Required
for Installation
Models
Wire Size
Max. Current Rating Type
XT-40
IT-RSS
#10 AWG
(6 mm
2
)
Stranded Wire
Included
30 Amps
Fuse(s) or Breaker(s)
Not Included
Class RK5 Fuse(s)
or
Single-Pole / Single Throw
Breaker for each Phase
or
Multiple-Pole / Single Throw
Breaker