23. State the need for RCDs electrical installation.
22. for use mobile equipment out doors required IEE
Regulation 411.
21. List typical ‘exposed parts’ installation.
24.
25. Use sketch show the path taken earth fault current.3.3. State the meaning fault protection. Briefly describe application for RCBOs. State the meaning basic protection. supplying socket outlets with rated current not exceeding 20A
and
b. Use bullet points and simple sketch briefly describe the operation
of RCD.257
U W
6 6
2 2
C1
L1 C1
2
C3
4
5
6
To phase supply
To phase motor
20.
.
a.
28.
27. Use sketch show how ‘discrimination’ can applied piece of
equipment connected final circuit. List typical ‘extraneous parts’ building.
26
