Use bullet points and simple sketch briefly describe the operation
of RCD. List typical ‘extraneous parts’ building.
25. Use sketch show how ‘discrimination’ can applied piece of
equipment connected final circuit.3.
a.
. State the meaning basic protection.257
U W
6 6
2 2
C1
L1 C1
2
C3
4
5
6
To phase supply
To phase motor
20.
28.
23. supplying socket outlets with rated current not exceeding 20A
and
b. State the meaning fault protection.
26. State the need for RCDs electrical installation.
24. Use sketch show the path taken earth fault current. Briefly describe application for RCBOs.
21. for use mobile equipment out doors required IEE
Regulation 411.
22. List typical ‘exposed parts’ installation.
27.3
