RDM0021/0 Page 3 of 16 © 2017 Protec Fire Detection plc
1.0 Introduction
1.1 What is an Emergency Voice Communication System
An Emergency Voice Communication System, or EVCS, is a system that allows voice communication in
either direction between a central control point and a number of other points throughout a building
or building complex, particularly in a fire emergency situation. The control points, or outstations by
which they are more commonly referred, generally comprise of a Type A outstation, a Type B
outstation, or a Type C Combined Type outstation. “Assist Call” emergency assistance alarm systems
can also be incorporated into the EVCS.
EVCS is generally required in the following situations:
• In any building or sports or similar venue where there are disabled people, or people who may
have difficulty negotiating the evacuation route.
• In buildings with phased evacuation and/or firefighting lifts where it facilitates secure
communications for building managers, fire wardens, and attending fire officers.
• At sports venues and similar complexes, where it will assist stewards in controlling the
evacuation of the area in an emergency.
The EVX-228 Emergency Voice Communications System (EVCS) is designed to fully comply with BS5839
Part 9:2011 for use as a Fire Telephone system, Disabled Refuge Call system or as a combined system
when both Fire Telephones and Disabled Refuge Points are required.
1.2 Suitability
Fire telephone systems are recommended for all public buildings and multi-story buildings over four
floors by BS9999.
Disabled Refuge systems are required in buildings where the public or disabled staff gains access to
any floor other than the ground floor using lifts. Refuge areas are provided at each storey exit from
each protected stairway.
2.0 Product Overview
The EVX EVCS, or EVX-228, comprises of a Master Station and one or more outstations. Additionally
the “Assist Call” emergency assistance alarm system can either be connected to the same line as an
outstation, or connected to a dedicated line. As each line is powered from the Master Station, the
outstations and the “Assist Call” emergency alarm system do not require a separate power supply unit.
This has the additional benefit of each line being fully monitored and battery backed up.
Each EVX-228 Master Station can also perform as a EVX-228 Repeater Station. A EVX-228 Repeater
Station mimics the EVX-228 Master Station both in operation and indication. Any reference in this
document to the EVX-228 Master Station also applies to the EVX-228 Repeater Station, unless specified
otherwise.
The EVX-228 Master Station has been designed for radial star topology. In most cases this will reduce
the cable requirements for all ring-based systems. The topology consists of spurs formed of 1 off two
core 1.5mm CSA cables (soft skin enhanced up to 500m per leg, MICC 200m per leg) to each
outstation.
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