This means that a remote Mute or Test option can be taken up by fitting a simple momentary action 'push to make' switch.

More importantly, these terminals should always be used to connect between the Plant Alarms on the Central Panel location, where more than one alarm is used (i.e. where system with more that 5 gases are operating).

One function of the Mute button silences the audible warning for a fixed period. However, on the Central Alarm, the mute function also stabilises the flashing gas warning conditions that are lit, which is then stabilised on all repeater panels around the site. This tells remote operators that the gas warnings have been centrally recognised and that servicing procedures are in place. If this parallel link between these terminals on a multi Central Panel are not made, then a gas alarm being muted on the second or third alarm at the central point would not issue the stabilising function.