Bus control, as the name suggests, involves a single bus circuit connected to multiple devices. As shown in the figure below, all smoke exhaust outlets in the same smoke control zone can be controlled by a single bus control line. By pressing one button on the bus control panel, all smoke exhaust outlets can be activated simultaneously. There are two indicator lights: a start indicator and a feedback indicator.
The main devices for bus control are as follows:
1. Smoke and exhaust system: activation of supply air outlets, electric smoke barriers, smoke exhaust outlets, smoke windows, and smoke valves;
2. Fire curtains: deployment of fire curtains set in non-evacuation passages;
3. Fire alarm and emergency broadcast system: manual control of the corresponding area, broadcasting emergency announcements.
Multi-line control refers to a control circuit that connects only one device and does not share the circuit with other devices. Therefore, multi-line control is also known as dedicated line control, meaning they are synonymous.
The main devices for multi-line control are as follows:
1. Smoke and exhaust system: start and stop buttons for smoke and exhaust fans;
2. Automatic sprinkler system: start and stop for the sprinkler fire pump;
Activation and deactivation of the electric valves in the pre-action valve group;
Activation and deactivation of the electric valves before the quick exhaust valve inlet;
Activation and deactivation of the rain curtain valve group (including the rain curtain valve of the water curtain system).
3. Fire hydrant system: start and stop for the fire hydrant pump.
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