Insulator insulator material, usually non-metal, which the electrons
are very firmly bound the nucleus and, therefore, will not allow heat or
.
Instructed person instructed person person adequately advised supervised skilled
persons able avoid the dangers which electricity may create. circuit called impedance
and given the symbol Z.
Friction force Friction force the force which resists prevents the movement two
surfaces contact. causes the current the circuit lag behind the applied voltage.
Inspection and testing techniques The testing installation implies the use instruments obtain
readings. force
may cause stationary object move bring moving body rest. Under fault conditions will melt
when overcurrent flows, protecting the circuit conductors from damage. All existing
installations should periodically inspected and tested ensure that
they are safe and meet the regulations the IEE (Regulations 610 634).
Hazardous area area which explosive gas–air mixture present called hazard-
ous area, and any electrical apparatus equipment within hazardous
area must classified flameproof protect the safety workers’.
Force The presence force can only detected its effect body.Glossary terms
378
Flexible conduit Flexible conduit manufactured 731-1: 1993 made interlinked
metal spirals often covered with PVC sleeving.c.
Hazard hazard something with the ‘potential’ cause harm, for example,
chemicals, electricity working above ground.
Impedance The total opposition current flow a.
Gravitational force Gravitational force the force acting towards the centre the earth due to
the effect gravity.
Heating, magnetic chemical The three effects electric current: When electric current flows a
circuit can have one more the following three effects: heating, mag-
netic chemical.
Functional switching Functional switching involves the switching off, varying the sup-
ply, electrically operated equipment normal service.c.
Fluorescent lamp fluorescent lamp linear arc tube, internally coated with fluorescent
powder, containing low-pressure mercury vapour discharge.
Inductive reactance Inductive reactance (XL) the opposition a. current inductive
circuit.
Inertial force Inertial force the force required get things moving, change direction
or stop.
Hazard risk assessment Employers more than five people must document the risks work and
the process known hazard risk assessment.
Fuse fuse the weakest link the circuit. However, test unlikely identify cracked socket outlet, a
chipped loose switch plate, missing conduit-box lid saddle, is
also necessary make visual inspection the installation
