Paper 8 Flashcards
State three characteristics of a low resistance ohmmeter which are necessary for compliance with BS 7671 excluding those required to comply with GS 38
GN3, 4.3 refers;
- Test current derived from no-load voltage between 4v & 24v
- Short circuit current no less than 200mA
- Minimum range 0.20 to 2.00 to 2 decimal places
b) List five reasons why a periodic inspection and test may be requested by a client.
Date required by previous EICR or EIC Change of use Change of occupier Insurance company request Building society request Licensing authority request Following damage (by flood or fire etc) Any 5
c) List five items of information which may be obtained from the operational manual, for an electrical installation, prior to carrying out inspection and testing.
Description of how system is to operate.
Information necessary to confirm correct operation.
distribution board details, identifying
the circuits, the protective devices’
wiring system and the installation methods
Technical data for all items installed, such as switchgear, luminaires and accessories’
Any special instructions/control systems.
d) State two measures that need to be considered by an inspector to ensure the safety of others during inspection and testing.
Any 2
Inspection precedes testing, checking for any immediate dangers, prior to opening enclosures.
Where ever possible testing should be undertaken dead following safe isolation. Live testing should only take place where there will be no exposed live parts, and comply with the electricity at work regulations.
Customers and their staff must be notified prior to de-energising to ensure no adverse effects i.e. People stuck in lifts
Describe, in detail, what the inspector must consider during an initial ‘walk around’ survey in order to determine appropriate sample sizes prior to inspection and testing in relation to each of the following:
a) The building
Use, environment and quality and frequency of maintenance.
a) The inspector will need to evaluate the attitude of the occupier, in terms of management of the building, if the owners are obviously not prepared to spend money on maintaining the building and there are no records, trunking covers are missing, perhaps there is a variety of broken pieces of equipment, poor suitability of the building for its intended use, if there are special locations such as a swimming pool or exhibition stands in a poor state of repair, are visitor and staff safe in this environment, are there inadequate fire exit signs, are fire doors blocked. Are there sources of ignition near combustible materials?
In domestic situations, again there is the attitude of the owner or occupier, DIY enthusiast “have a go Joe” or even student accommodation where damages are not reported or temporarily fixed
All of these things would suggest sampling should be extremely limited if used at all.
Describe, in detail, what the inspector must consider during an initial ‘walk around’ survey in order to determine appropriate sample sizes prior to inspection and testing in relation to each of the following:The electrical installation
The inspector will need to consider;
The age and likely condition of the installation,.
The type and usage of the installation.
The environmental conditions.
The quality of ongoing maintenance.
The period of time since the last inspection and any records obtained.
If sampling is to be employed other than areas which are relied upon for safety such as earthing and bonding, main intake and distribution boards.
The inspector should increase the inspection and testing if defects are identified, if further defects are identified 100% of the installation, where accessible, may need to be inspected and tested
Describe, in detail, what the inspector must consider during an initial ‘walk around’ survey in order to determine appropriate sample sizes prior to inspection and testing in relation to each of the following:c) The records
Previous records will be used to identify whether the installation is deteriorating and at what pace, if there are no previous records, it would be difficult to justify limited sampling as a true reflection of the entire installation. The inspector will also need to check, charts, diagrams, schedules etc. if these are not available a site survey should be undertaken
A 30 mA RCD is required to provide additional protection for a final circuit containing a number of socket outlets used by ordinary persons for general use.
a) State three other situations that require an RCD to be installed to provide additional protection.
Not mechanically protected or unscreened cables buried less than50mm deep in a wall.
Not mechanically protected or unscreened cables buried at any depth in a wall constructed of metal studwork
All circuits in a bathroom
All final circuits other than emergency lighting in exhibitions, shows and stands (711)
Or any three suitable answers
State what must be agreed with the client prior to undertaking any periodic inspection and testing.
Extent and limitations
State where the results of the agreement in 4a) above would be documented.
Electrical Installation Condition Report
List three characteristics of the supply that an inspector needs to record on the main documentation issued following a periodic inspection and test.
Earthing system
Ze
PFC
Any from EICR
d) State the three classification code numbers, together with their description, used to classify the severity of any deviation or defect found during a periodic inspection and test.
C1 = immediately dangerous C2 = potentially dangerous C3 = improvement recomended
