Onsite Guide Questions

What is the recommended earth loop impedance for an installation forming part of a TT system?

• Exceeds 250 Ohms

• Does not exceed 200 Ohms

• Exceeds 200 Ohms

• Does not exceed 250 Ohms

What is the rating(A) of a BS 3036 in a final ring circuit?

• 5A

• 20A

• 15A

• 30A

How do you calculate voltage drop?

• (A/mv/m) x L x lD

             1000

• (A/mv/m) x ID x L

             1000

• (mV/A/m) x ID x L

             100

• (mV/A/m) x ID x L

             1000

What is the cable factor of solid singe core 1mm2 cable in conduit in short straight runs?

• 27

• 22

• 31

• 23

What is the Installation reference method o a circuit enclosed in a conduit in an insulated wall?

• A

• C

• B*

• 101

What is Ze?

• Is the nominal voltage to earth

• Is that part of the earth loop impedance external to the circuit concerned

• Is the resistance of the line from the origin of the circuit to the point of utilisation

• Is the earth Loop Impedance

What is the cable factor of a solid type of conductor with a 1.5mm2 conductor cross-sectional area

• 22

• 27

• 39

• 21

What is the length of the conductor cross-sectional area which is a solid type of conductor with a cabled factor of 16

• 17

• 15

• 22

• 16

What is the cable factor of a stranded type of conductor with a 6mm2 conductor cross sectional area

• 1.5

• 2

• 4

• 2.5

What is the factor of a dimensions of tusking 75x25

• 721

• 865

• 357

• 738