1 The pre-discharge alarm may be activated before
the two separate system release controls are operated (e.g. by a micro-switch
that activates the pre-discharge alarm upon opening the release cabinet
door as per paragraph 2.1.3.2). Therefore, the two separate controls
for releasing carbon dioxide into the protected space (i.e. one control
to open the valve of the piping which conveys the gas into the protected
space and a second control used to discharge the gas from its storage
containers) as per paragraph 2.2.2 can be independent of the control
for activating the alarm.
2 A single control for activation of the alarm
is sufficient.
3 The "positive means", referred to in paragraph
2.2.2.1 for the correct sequential operation of the controls, should
be achieved by a mechanical and/or electrical interlock that does
not depend on any operational procedure to achieve the correct sequence
of operation.