schneider-wiring-diagram-book

Nonautomatically Started. For a nonautomatically started motor, the overload protection shall be permitted to be shunted or cut out of the circuit during the starting period of the motor if the device by which the overload protection is shunted or cut out cannot be left in the starting position and if fuses or inverse time circuit breakers rated or set at not over 400 percent of the full-load current of the motor are so located in the circuit as to be operative during the starting period of the motor

A body-shell is normally constructed in one of two ways: it is either made by spot-welding the panels, pillars and pressings together so as to form a strong box, or by building a space frame (Figure 1.43). The latter structure gives a skeleton of high structural strength on to which is attached the steel, aluminium or glass- reinforced plastic (GRP) body panels, doors, roof, etc. Of the three materials used, steel is the most common for vehicles made in high volume; this is because production costs are lower once the initial outlay on expensive body jigs and robots has been recovered.

The safety of a modern car is improved by enclosing the driver and passengers in a rigid cell. At the front and rear of this safety compartment are attached sub- frames; these are designed to concertina on impact as shown in Figure 1.44. The crumple zones of the body are intended to absorb the shock of a collision and, in consequence, reduce the rate of deceleration