Electrical System - Nortel DMS-100 Series Maintenance Manual

Outside plant access cabinet (opac)

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Table of Contents

2-14 OPAC maintenance overview

Electrical system

The electrical system consists of several components. These components

include the ac interface and distribution, ac generator transfer switch, the

modular supervisory panel (MSP), the rectifiers and battery control unit

(BCU). Additional components include the batteries and associated cabling

and ground bars.

The following sections describe the powering system and electrical

equipment in greater detail.

Power requirements

The OPAC supports a maximum of three 25 A rectifier modules. These

modules power several different equipment and system configurations. A

list of the business supply features appears in the following table.

Commercial power features

An OPAC with 640 lines requires two 25 A, 52.5 V rectifier modules and

200 Ah battery reserve to maintain stand-by power.

297-8211-550 Standard 05.01 August 1999

Requirements

Single phase, 3-wire commercial power, 176–264 V, 47–63 Hz

ac small amount at 100 A

Metal oxide, varistor solid state, Joslyn Number 1250–33

One dedicated outlet for ac heaters and two 120 V ac support

outlets with a standard GFC Interrupt.

A maximum of three NT MPR25 (NT5C06) 25 A rectifier

A maximum of 300 Ah provide 6.6 h minimum reserves under

maximum power drain.

A 60 A Hubbel emergency generator connector.

An attached power pedestal with a double-pole, double-throw

(DPDT) knife switch.

Perform an emergency transfer with the transfer switch and

generator connector, Hubbell Part Number 460B12W.