The IEE Wiring Regulations Explained and Illustrated, 2nd Edition

Protection

some exceptions to this requirement; these are listed quite clearly

in Section

473

of the IEE Regulations. As an example, protection

is not needed in a ceiling rose where the cable size changes from

1.0 mm to, say, 0.5 mm for the lampholder flex. This is permitted

as it is not expected that lamps will cause overloads.

Protection against undervoltage

[IEE Regs Chapter 45 and Section 535]

From the point of

view

of danger in the event of

a

drop or loss of

voltage, the protection should prevent automatic restarting of

machinery

etc.

In fact such protection is an integral part of motor

starters in the form of the control circuit.

The