Identify the correct symbol for the rating of the protective device
In
Ib
It
Iz
Identify the correct symbol for the max.current rating of the selected conductor size
Iz
Ib
It
In
Identify the correct symbol for the rating of the 'tabulated current', where correction factors have had to be applied
It
Ib
Iz
In
Select the correct formula for calculation of 'tabulated current'
Ib/correction factor
Ib x correction factor
It x correction factor
In/correction factor
A 5.5A load has a conductor protected by a 6A mcb and has the following correction factors applied; Ca = 0.94 and Cg = 0.6. Calculate the 'tabulated current' required.
10.64A
3.38A
12.54A
9.66A
A 25A load has a conductor protected by a 32A mcb and has the following correction factors applied; Ca = 0.71 and Cg = 0.75. Calculate the 'tabulated current' required.
60A
50A
40A
70A
A 40A load has a conductor protected by a 50A BS88-2 fuse and has the following correction factors applied; Ca = 0.94 and Cg = 0.6. Calculate the 'tabulated current' required.
88.7A
82.8A
79.9A
60.2A
identify the standard correction factor for a BS3036 'semi-enclosed' fuse
0.075
0.725
0.755
0.255
state the INSTALLATION METHOD for a cable that is 'clipped direct to a surface'
method A
method C
method E
method 100
A circuit has a Zs value of 0.95 ohms. If the Ze value is given as 0.35 ohms, state the value of (R1+R2) for the circuit
0.6 ohms
1.3 ohms
2.71 ohms
0.34 ohms
A circuit has a Ze value of 0.55 ohms. If the (R1+R2) value is 0.85 ohms, state the value of Zs for the circuit
1.4 ohms
0.9 ohms
0.3 ohms
1.55 ohms
State the maximum recommended 'measured' impedance for an earth electrode on a TT system
200 ohms max
1666.7 ohms max
1000 ohms
21 ohms
a circuit has a 16 sqmm line conductor. Select an appropriate earthing conductor size
16 sqmm
6 sqmm
10 sqmm
25 sqmm
a circuit has a 25 sqmm line conductor. Select an appropriate earthing conductor size
16 sqmm
6 sqmm
10 sqmm
25 sqmm
a circuit has a 50 sqmm line conductor. Select an appropriate earthing conductor size
25 sqmm
6 sqmm
10 sqmm
50 sqmm
If a circuit conductor has had 'correction factors' applied, identify the current value that is used to make the final conductor size selection.
the design current
the tabulated current
the protective device rating
the Iz value
If a circuit conductor has had no 'correction factors' applied, identify the current value that is used to make the final conductor size selection.
the design current
the protective device rating
the current required by the load
the Iz value
state the INSTALLATION METHOD for a cable installed on a cable-tray
method A
method E
method C
method 102
state the INSTALLATION METHOD for a cable hanging in 'free air'
method A
method E
method C
method 102
state the INSTALLATION METHOD for a cable buried in ducting
method A
method D
method C
method F
state the INSTALLATION METHOD for a cable installed in conduit on a wall
method A
method B
method C
method E
state the INSTALLATION METHOD for a cable installed in conduit on a thermally insulating wall