26.
21.
23. State the need for RCDs electrical installation.3.
27. Use sketch show how ‘discrimination’ can applied piece of
equipment connected final circuit. Briefly describe application for RCBOs. List typical ‘exposed parts’ installation. State the meaning basic protection. supplying socket outlets with rated current not exceeding 20A
and
b. State the meaning fault protection.
28.
a.
24. Use sketch show the path taken earth fault current. for use mobile equipment out doors required IEE
Regulation 411.257
U W
6 6
2 2
C1
L1 C1
2
C3
4
5
6
To phase supply
To phase motor
20.3.
. Use bullet points and simple sketch briefly describe the operation
of RCD.
22. List typical ‘extraneous parts’ building.
25
