Differences Between Bus Control and Multi-Line Control

Bus control, as the name suggests, refers to a control system where many devices are set up on a single bus circuit. As shown in the figure below, all smoke exhaust outlets in the same smoke compartment can be controlled by a single bus control line. A button on the bus control panel can simultaneously control the operation of all smoke exhaust outlets. 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: opening of air supply ports, electric smoke curtains, smoke exhaust outlets, smoke exhaust windows, and smoke exhaust valves;

2. Fire curtains: descending of fire curtains set up in non-evacuation passages;

3. Fire alarm and emergency broadcast system: manual control of the corresponding area, broadcasting emergency announcements.

Multi-line control, in contrast to bus control, refers to a control circuit that connects only one device without sharing the circuit with other devices, hence it is also called dedicated line control. Therefore, multi-line control and dedicated line control mean the same thing.

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 fire extinguishing system: start and stop for the sprinkler fire pump;

Start and stop of electric valves in the pre-action valve group;

Start and stop of electric valves before the quick exhaust valve inlet;

Start and stop of rain curtain valve groups (including water curtain system rain curtain valves).

3. Fire hydrant system: start and stop of the fire hydrant pump.

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