18th Edition Part 5 Mock 1

Which one of the following devices would not be suitable for use as a circuit isolator?

• a)        A device with semiconductors
• b)        A contactor
• c)         An RCD
• d)        A fuse

Wiring systems shall be selected and erected so as to be suitable for?

• a)        The maximum ambient temperature
• b)       The maximum conductor temperature
• c)        The highest and lowest local ambient temperature
• d)       The maximum and minimum conductor temperature

Type 1 SPD's (Surge Protection Devices) are often referred to as?

• a)         Exposed conductive SPD's
• b)         Extraneous conductive SPD's
• c)         Equipotential bonding SPD's
• d)         Earth bonding SPD's

An item of switchgear is installed behind a fixed panel thus making the operation of the switchgear impossible for the operator to observe. In such situations a suitable indicator must be fixed in a position where the operator can see the effect of the operation, the indicator must comply with?

• a)        BS EN 3535
• b)        BS EN 4444 or BS EN 6346
• c)        BS EN 60073 and BS EN 60447
• d)        BS EN 12954

All outdoor lighting installations need to be carefully selected and erected, but which type of lighting is excluded from BS 7671?

• a)       Festoon lighting that is temporary
• b)        Road lighting
• c)        Advertising signs
• d)        Phone kiosks

What is the maximum operating temperature for thermosetting cables?

• a)        70°c
• b)        80°C
• c)        90°C
• d) 105°C

If the cross-sectional-area (c.s.a) of the supply PEN conductor where PME applies is 100 mm2, what is the minimum size the main protective bonding conductor can be?

• a) 16 mm2
• b)            25 mm2
• c) 35 mm2
• d) 50 mm2

A PEN conductor when insulated can use the following insulation colour?

• a)       Green-and-Yellow only
• b)        Blue only
• c)        Green-and-Yellow throughout its length with blue markings at the terminations
• d)       Green only

An automatic electrical safety supply with a maximum changeover time of 3.5 seconds is classified as a?

• a)        Short break
• b)        NormaI break
• c)        Medium break
• d)        Long break

What does the external influence code AH3 represent?

• a)         Very low severity vibration
• b)        Low severity vibration
• c)         Medium severity vibration
• d)        High severity vibration