Liebert NfinityTM manual Cable Installation, Wiring Preparation

Installation

2.3Cable Installation

2.3.1 Wiring Preparation

! WARNING

Please read this section thoroughly before attempting to install wiring to this unit.

This UPS should be installed by a qualified / certified electrician.

Removing the Cover Plates

Customer-Provided Overcurrent Protection

A branch rated overcurrent protection device (cir- cuit breaker or fused disconnect switch) must be installed for the AC input.

If the start-up is on bypass, the UPS has a six- cycle inrush current that is up to 20 times the rated output current. This must be taken into account when selecting the overload protection device at the AC input supply distribution point. To avoid random tripping on start-up, it is recom-

On the back of the UPS, cover plates are over the input and output terminals, as shown at right. Keep screws and plates to one side.

Remove Cover Plates

mended that the AC input supply be protected with a circuit breaker capable of withstanding this initial inrush.

This UPS is fitted with EMI suppression filters. Earth leakage current is less than 40mA. Tran- sient and steady state earth leakage currents may occur when starting the equipment. This should be taken into account when selecting ground cur- rent detection devices, as the earth leakage cur- rents of both the UPS and load will be carried.

Input and output cables must be run in separate conduits.

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