⟩ What is contactor?
It is used in control circuits.
It is used in control circuits.
The most suitable item of equipment to mark a straight line in order to install a horizontal conduit over a distance of 4 m is a
A 50 mm x 50 mm steel trunking has a tabulated space factor of 1037. If the tabulated factor for PVC cable having a cross sectional area of 6 mm2 is 21.2, the maximum number of these cables that can be installed into the trunking is
The four electrical tests that should be carried out on a new ring final circuit before it is energized are
Certain discharge luminaries mounted above rotating machine can give the appearance that the machine is at a standstill. This effect is known as
The Electricity at Work Regulations state that electrical equipment must be maintained to prevent danger. Electrical equipment is defined as all small items of battery-powered equipment up to and including overhead power lines rated at
In order to prevent danger during maintenance operations, a voltage warning notice is required on all electrical accessories where
Once a low-pressure mercury vapour lamp has lit, the purpose of the choke/ballast unit is to
Balancing loads over three phases will reduce
In order to facilitate maintenance of a complex electrical system, the sequence of control for isolation can be best shown using a
Which of the following normally form part of a highway electrical system?