APC Smart UPS RT User Manual download pdf (Page 12)

ONNECTING THE EPO (EMERGENCY POWER OFF) OPTION

The output power can be disabled in an emergency by closing a switch connected to the EPO.

Adhere to National and local electrical codes when wiring the EPO.

The EPO switch is internally powered by the UPS for use with non-powered switch circuit breakers.

The EPO circuit is considered a Class 2 circuit, (UL, CSA standards) and a SELV circuit (IEC

standard).

Both Class 2 and SELV circuits must be isolated from all primary circuitry. Do not connect any

circuit to the EPO terminal block unless it can be confirmed that the circuit is Class 2 or SELV.

If circuit standard cannot be confirmed, 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 floor to floor shaft.

• 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).

EPO

switch

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APC Smart UPS RT User Manual Page 12