23.
25. Use bullet points and simple sketch briefly describe the operation
of RCD.
26. State the meaning fault protection. State the need for RCDs electrical installation.
27.
.
21.
24. List typical ‘extraneous parts’ building. Use sketch show how ‘discrimination’ can applied piece of
equipment connected final circuit.
28. List typical ‘exposed parts’ installation.3. supplying socket outlets with rated current not exceeding 20A
and
b.3. Briefly describe application for RCBOs.
22. 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. Use sketch show the path taken earth fault current.
a. for use mobile equipment out doors required IEE
Regulation 411
