Paper 2 Flashcards
what is the main purpose of carrying out a periodic inspection
To determine, so far as is reasonably practicable whether the installation is in a satisfactory condition for continue use
what is the main purpose of testing during a periodic inspection
To confirm that the disconnection times stated in chapter 41 are met
identify three factors which determine what the maximum disconnection times are
Any 3; from regulations 411.3.2.2, 3 & 4 A, Nominal Supply voltage B, earthing system C, type of current D, type of circuit and protective device / final circuits up to 32A or final circuits over 32A and distribution circuits
State three reasons for undertaking a periodic inspection.
A, the safety of persons and livestock against the effects of electric shock and burns
B, protection against damage to property by fire and heat resulting from an installation defect
C, confirmation that the installation is not damaged or deteriorated so as to impair safety
D, the identification of installation defects and departures from the requirements of the regulations that may give rise to danger
State three different examples of a limitation that may be agreed with a client, during a periodic inspection.
Degree of sampling Circuits not to be tested Unable to turn off the circuit loads not to be removed Limited inspection due to no access
State two situations where the human sense of touch could be used by an inspector.
Loose conductor/cable connection Cables or equipment hot Accessory not fixed properly Switches not working correctly (Other suitable answers)
state the requirements of the Electricity at Work Regulations for the safe inspection of electrical systems and equipment; identified in GN3
4 (2)As may be necessary to prevent danger, all systems shall be maintained so as to prevent, so far as is reasonably practicable, such danger.
4 (3)Every work activity, including operation, use and maintenance of a system and work near a system, shall be carried out in such a manner as not to give rise, so far as is reasonably practicable, to danger
You may get some marks for quoting EWR 4 (1) and 4 (2) or your own wording, something like;
systems must be maintained reasonable practicably free from danger and The maintenance of systems shall be carried out reasonable practicably free from danger.
specify an appropriate procedure for completing safe isolation
Check with user safe to switch off Check tester complies with GS38 Identify circuit to be worked on Energise identified circuit Place signs and barriers Switch off Lock off Test the tester Test the circuit Test the tester AGAIN. >.minimum
under what circumstances might the verification of voltage drop be required
Not normally required following the installation of a new circuit as the designer should have done calculations to ensure compliance with the current version of BS7671 AND
Where the length, design current, nominal voltage, conductor temperature or wiring systems may have been adversely altered since the original installation design. Or
Where the original circuit current loading has been increased or the conductors have been extended to a point where the resistance multiplied by the design current no longer complies with the maximum voltage drop allowed.
NB; prior to 2008 (17th edition) the maximum voltage drop for lighting circuits was 4%, this has now been reduced to 3% so where installations were designed to a previous edition, the regulations are not retrospective providing there is no safety issue.
state four reasons for requiring a periodic inspection as identified in IET Guidance Note 3
Any 4 GN3; 3.2
A, confirmation that the installation is not damaged or deteriorated so as to impair safety, requested by insurance companies, mortgage lenders and the like.
B, After the maximum required time identified by either the designer or the person who did the last periodic inspection
C, On a change of occupancy of the premisis
D, On a change of use of the premises
E, Where there is reason to believe that damage may have been caused to the installation, following flood, fire or other reported fault.
what needs to be entered in the extent and limitations box, who would this be agreed with and when
Extent of the electrical installation covered by this report
Agreed limitations including reasons
This would be agreed with the person ordering the work
This should be agreed in writing prior to starting the inspection
Identify three factors that determine the frequency of periodic inspections
Any three Type of installation and equipment Use and operation Frequency and quality of maintenance External influences
identify two types of phase rotation tester as listed in GN3
Rotating disc type
Indicator lamp type
