auxiliary rafter
Above a principal rafter, a second principal rafter, occasionally used in a large queenpost truss.
Above a principal rafter, a second principal rafter, occasionally used in a large queenpost truss.
The automatic disconnection of a part of the electrical load in a building when there is an outage of the
In an elevator: an operation whereby the starting of the elevator car is effected in response to the momentary actuation
An alarm system whose smoke detectors initiate and transmit an alarm automatically.
A sprinkler head having a nozzle which is normally closed, but opens when exposed to a predetermined quantity of heat
1.A fire-protection sprinkler system connected to a suitable water supply; designed to provide an immediate and continuous flow of water