This device, in escalators, stops the escalator automatically

if an abnormal current is supplied to the motor.

In elevator, these prevent the excessive car travel at the highest and lowest floor.

he number of cycles per unit time of a wave or oscillations expressed in hertz of cycles per second.

This device, in escalators, is provided at the drive unit location to protect against accidental movement of the escalator during inspection of the drives or during general maintenance.

In elevator, it protects the equipment from over current.

In elevator, it detects the obstacles during the door closing, and reopens the door if there is something. Photocell can be used together with this.

Color code for pipes containing acid.

This type of perimeter detector detects a change in capacitance

of the area covered, caused by intrusion.

The interior bottom surface of a pipe.

The length of a pipeline measured along the centerline of the pipe and pipe fittings.

A water closet similar to that of the siphon jet but

with a smaller water surface and trapway.

A toilet bowl in which the flushing water enters through the rim and a siphonic action

initiated by a water jet draws the contents of the bowl through the trapway.

The centerline of pipe.

In elevator, it makes the buzzer alarm when the car is overloaded and

the door remains open until overloading is eliminated.

A type of water closet that is noisy but highly efficient. Strong jet into up leg forces contents out.

Use only with flush valve, requires higher pressure.

A type of perimeter detector which detects object in heat range of body temperature.

Water closet that is quiet, extremely sanitary, water is directed through the rim.

It scours bowl, folds over into jet; siphon.

A valve closed by a disk seating on an opening in an internal wall.

Under NBC, the clearance between the underside of the car and the bottom of the pit shall not be less than ___.