After the return to work following the epidemic, the edge RHidoor’s fire-rated electric roller shutter brings is improved automatic control. Let’s get into the specifics.
The fast fire-rated electric shutter is mainly used in high-rise buildings, to seal off the fire source at stairwells or elevator lobbies and let people escape safely. In medium and large commercial buildings it also works as a fire wall. So it plays a big part in building fire safety. Here’s a primer on the electric fast fire-rated shutter across design, use, and installation. In high-rise residential and multi-story public buildings, control of the electric fast fire-rated shutter should meet three methods at once: automatic, local manual, and remote from the fire control room. This is spelled out in the Code for Electrical Design of Civil Buildings.
The automatic signal comes from smoke and heat detectors on the ceiling on one or both sides of the shutter. The signal goes to the link control box, which sends the execute command to the shutter control box, raising or lowering the fast shutter.
For a shutter at the elevator lobby of a high-rise office or residential building, fire is more likely on the corridor side than the stairwell side. So consider a pair of smoke and heat detectors on the corridor side, and just one smoke detector on the inner elevator side. The two smoke detectors inside and outside act together. When either picks up smoke, the door drops 1.8 m from the floor. If the fire door between the elevator lobby and the escape stairwell is also a shutter, fit a pair of smoke/heat detectors in the lobby to control that stairwell door too.
When designing the fire linkage system, watch the control voltage. The shutter link control box is a signal output device in the alarm series. By rule its working voltage is DC 24V, but makers may allow AC 36V and above for reliability and safety. So the shutter has two control voltages: DC 24V and AC 220V. On a straight run in one fire zone, one shutter dropping won’t hurt the fire function. Smoke spreads fast; after the first shutter drops, if the fire isn’t controlled the smoke reaches the second shutter and drops it too. The second-stage drop is controlled by the heat detector at that spot.
When several shutters seal one straight fire-zone run, keep the detectors encoded in groups of three or fewer. When any pair signals, all three drop together. Then one link control box drives one shutter, and the rest sit on the automatic control line. Each shutter control box parallels the one driven directly by the link box. Starting more than three at once draws a large current, so the relays, main switch, and wiring must scale up, which is wasteful. Also, too many units on one group means more failure points and slower fixes.