317E Questions on dead testing

Which of the following is a statutory document?

• Electricity at work regulations 1989

• BS7671:2018 requirements for electrical installations

• HSG85 Electircity at work safe working practices

• HASAWA

When inspecting the readily accessible top horizontal surface of a distribution board, which of the following provides the required minimum degree of protection?

• IP2X

• IPX2

• IP4X

• IPX4

Continuity test values are typically measured in which of the following ohmic ranges?

• Low ohms

• High ohms

• Low mega ohms

• High mega ohms

 

17. A ring final circuit is installed with 2.5mm² live conductors and 1.5mm² circuit protective conductors. If the resistance of the line (and neutral) conductors measured end-to-end is 0.78Ω, what is the end-to-end resistance of the circuit protective conductor? 

• 0.13Ω 

• 0.47Ω

• 0.78Ω 

• 1.3Ω 

Which of the following responses is the most appropriate for the correct outcome of an insulation resistance test?

• Low leakage current, low insulation resistance

• High leakage current, low insulation resistance

• High insulation resistance, high leakage current

• High insulation resistance, low leakage current

Which of the following is the minimum insulation resistance prescribed by table 64 of BS7671 for a 230v circuit? 

• 0.25MΩ 

• 0.5MΩ 

• 1.0MΩ 

• 4. 2.0MΩ 

   

The total resistance of a number of resistances in parallel can be found using which of the following? 

• 1.  1 =   1  +  1  +  1 

  Rt    R1    R2    R3 

• RT = R1  +  R2  +  R3 

• 3. 1  =  1  x  1  x  1 

  RT    R1    R2   R3 

• RT  =  R1  -  R2  -  R3

Which of the following actions is required prior to carrying out an insulation resistance test? 

• Open all switches

• Close all switches 

• Switch on the supply 

• Connect all indicator lamps 

A polarity test is carried out to confirm that single pole devices are correctly connected in which of the following? 

• Line conductor 

• Neutral conductor  

• Circuit protective conductor 

• Live conductor 

When testing continuity of a ring final circuit wired with 2.5/1.5 PVC/PVC conductors using ‘Method 1’. The value of R1 is 0.4Ω, what should be the approximate value of R2

• 0.60 Ω

• 1.00 Ω

• 0.67 Ω.

• 0.16 Ω.