An EVCS is a fixed, secure, bi-directional, full duplex voice communication system to assist firefighters during emergencies in high-rise buildings or large sites where radio communication cannot be guaranteed to work due to interference from the fire corona.

BS 5839-9:2021 covers the design, installation and operation of fire telephones and disabled refuge systems in buildings, and where both systems are fitted to a building, the standard specifies these should form a single system.

The EVX-OSA is a Type A EVCS outstation compatible with the EVX standalone and network systems.

The outstation is supplied in a brushed stainless finish with a high contrast red screen print with a rugged red telephone handset behind the push door.

A stainless steel bezel is available to allow the outstation to be flushed into a wall reducing the need to stock flush and surface variants.

Suitability
The EVX-OSA is a Type A outstation as defined in BS 5839-9:2021, and can be used as a fire telephone or a disabled refuge call point.

The EVX outstations are designed for use by multi-disability users, having high contrast signage in line with RNIB guidelines and an induction loop coil (to BSEN60118-4) in the handset.

Type A outstations are mainly used by building management, fire wardens and firefighters. They should be located as described in BS9999 and Building Regulations Approved Document B, these locations should have a low background noise otherwise, you may have to consider acoustic hoods.

Mounting The Outstation
The outstation should be mounted at a height of 1300 to 1400mm from to the centre line of the outstation to the floor to comply with the requirements of Building Regulations Document M (Access for the Disabled).

When flush mounting a cut out of 305mm by 155mm is recommended, the bezel slides over the box and is fixed on the wall using a suitable sealant or mastic If the outstation is to also to be used as a refuge point, suitable space must be allowed so the system can be used by a parked wheelchair.