2365 203 Pt 3

What is the recommended separation of electricity and gas supply according to BS7671?

• 25mm
• 50mm
• 100mm
• 150mm

Answer explanation

Figure 2.3 Page 26 OSG

What is the maximum drill size compared to joist depth according to the On Site Guide?

• x0.25
• x0.5
• x0.75
• x1.00

Answer explanation

Figure 7.3.1 Page 91 OSG

What are the bathroom zones in the On Site Guide?

• Zone 0, Zone 1, Zone 2
• Zone A, Zone B, Zone C
• Zone X, Zone Y, Zone Z
• Zone I, Zone II, Zone III

Answer explanation

Fig 8.1 (iii) Page 106 OSG

What are the R1+R2 resistances from the On Site Guide for a 4mm & 2.5mm T&E Cable?

• 4.61
• 16.71
• 12.02
• 9.22

Answer explanation

Table I1 Page 218 OSG

What is the maximum permitted disconnection time for TN-S electrical earthing systems?

• 0.1 seconds
• 1 second
• 0.4 seconds
• 5 seconds

What are the recommended RCD sizes according to BS7671 for additional protection?

• 30mA
• 300mA
• 100mA
• 500mA

What are sources of renewable electrical energy?

• Wind, Solar, Hydro
• Coal, Gas, Oil
• Nuclear, Hydro, Geothermal
• Diesel, Petrol, Natural Gas

What are extraneous electrical parts?

• Circuit breakers, RCDs, Fuses
• Junction boxes, Light switches, Plug sockets
• Earth rods, Clamps, Conductors
• Metalwork, Pipes, Ducts

Answer explanation

Section 4.3 Page 55 OSG

What symbol is used for external earth loop impedance?

• Zs
• R1
• R2
• Ze

Answer explanation

Appendix I Page 217 OSG

What electrical diagram is used to show the flow of energy within an electrical installation?

• Wiring
• Block
• Schematic
• Gantt