ST750 GENERAL HANDBOOK
667/HB/33750/000 Page 4 Issue 6
master switch has a lock, this should be used to keep the switch locked in the ‘off’
position.
When working on the controller in countries where both sides of the
incoming supply are above earth potential, the Master Switch or Circuit
Breaker on the rear of the Cabinet should be opened, since the
Controller Switch on the front of the ST750 does not isolate both sides
of the supply.
When re-commissioning signals, the following sequence is recommended:
1. Switch OFF the Cabinet Assembly at the master switch
2. Switch ON the lamps on-off switch on the manual panel
3. Switch ON the Cabinet Assembly at the master switch.
More specific safety information is given within the text of the handbook, where it
relates to particular activities or situations.
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