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CHAPTER 4: INSTALLATION
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Option 1: Internally Powered
(with Jumper Cable)
Option 2: Externally Powered
(no Jumper Cable)
12. If required, connect the Remote Emergency Power Off
(REPO) circuit. Check national and local codes before wiring.
The output power can be disabled in an emergency by
closing a switch connected to the REPO. You must physically
reset the system enable switch on the front of the UPS to
restart the unit.
• The REPO circuit is considered a Class 2
(UL and CSA standards) and SELV
(IEC standard) circuit.
• Class 2 Circuit: Used in North America by UL
and CSA. It is defined in the National Electrical
Code (NFPA 70, Article 725) and in the
Canadian Electrical Code (C22.1, Section 16).
• SELV Circuit: Used in Europe by IEC; acronym
for “safety extra low voltage.” A SELV circuit is
isolated from primary circuitry through an
isolating transformer and designed so that under
normal conditions, the voltage is limited to
42.4 V peak or 60 V dc
• Both Class 2 and SELV circuits must be isolated
from all primary circuitry. Do not connect any
circuit to the REPO terminal block unless it
can be confirmed that the circuit is SELV or
Class 2. If there is a question, use a contact
closure switch.
• Use one of the following cable types to connect
the UPS to the EPO switch:
CL2: Class 2 cable for general use.
CL2P: Plenum cable for use in ducts, plenums,
and other spaces used for environmental air.
CL2R: Riser cable for use in a vertical run in a
shaft of from floor to floor.
CLEX: Limited use cable for use in dwellings
and for use in raceways.
For installation in Canada: Use only CSA
Certified, type ELC (extra-low voltage
control cable).
• Wiring by a qualified electrician is required.
• Connect using Option 1 if internally powered.
• Connect using Option 2 if externally powered.
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Vdc