What is the maximum floor area for an A3 radial circuit?
100 sq metres
75 sq metres
50 sq metres
30 sq metres
What is the maximum floor area for an A2 radial circuit?
100 sq metres
75 sq metres
50 sq metres
30 sq metres
What is the maximum floor area for an A1 ring circuit?
100 sq metres
75 sq metres
50 sq metres
30 sq metres
What is the size of MCB required for an A1 ring circuit ?
20A
16A
30/32A
40A
What is the size of MCB required for an A2 radial circuit ?
20A
16A
30/32A
40A
What is the size of MCB required for an A3 radial circuit ?
20A
16A
30/32A
40A
How many socket outlets can be connected to an unfused 'spur' on an A1 ring circuit ?
one
two
ten
unlimited
How many socket outlets can be connected to a fused 'spur' on a ring circuit ?
one
two
ten
unlimited
How many socket outlets can be connected to an unfused 2.5sq mm 'spur' on an A2 radial circuit ?
one
two
ten
unlimited
Identify the abbreviation 'FCU' ?
Fused connection unit
Fused conductor unit
Furnished connection unit
First conductor unit
What is the maximum fuse size that can be used in a FCU ?
30A
20A
13A
6A
What is the minimum conductor size for an A1 ring circuit ?
1.5sqmm
2.5sqmm
4.0sqmm
6.0sqmm
What is the minimum conductor size for an A2 radial circuit ?
1.5sqmm
2.5sqmm
4.0sqmm
6.0sqmm
What is the minimum conductor size for an A3 radial circuit ?
1.5sqmm
2.5sqmm
4.0sqmm
6.0sqmm
If a 'spur' is required to connect socket A to an A1 ring using a junction box and FCU, as shown here. What is the minimum size of conductor allowed (arrowed)?
1.5sqmm
2.5sqmm
6.0sqmm
5.0sqmm
If a 'spur' is required to connect socket A to an A2 radial using a junction box as shown here. What is the minimum size of conductor allowed?
1.5sqmm
2.5sqmm
6.0sqmm
5.0sqmm
What is the maximum disconnection time for 230v AC portable equipment (of less than 32A) using a ring or radial system of socket outlets (assuming a TN system of Earthing)?
0.2 secs
0.4 secs
5 secs
10 secs
What is the maximum disconnection time for 230v AC portable equipment (of less than 63A) using a ring or radial system of socket outlets (assuming a TT system of Earthing)?
0.2 secs
0.4 secs
5 secs
10 secs
Often when DIY has been attempted involving RING circuits in a domestic dwelling, the following potentially dangerous situation can occur. What are the arrows referring to?
cross-connect
interconnect
disconnect
reconnect
State the maximum disconnection time for a 40A socket circuit rated at 40A, to be installed in a commercial installation on a TN system.