JMC Limited
electrical testing services
services --->Fixed electrical wiring systems
Fixed electrical wiring systems
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Electrical fixed wiring testing for all types of industry, providing you with reports that help you maintain a safe environment. We are NICEIC approved, which is recognised by all industries, allowing our reports to be presented on NICEIC forms. Re-assurance that you are safe
PERIODIC INSPECTION AND TESTING OF ELECTRICAL INSTALLATIONS
1.0 PURPOSE
To verify as far as is reasonably practicable within the limits of this specification that the electrical installation is in a safe condition and thereby complies with the fundamental requirements of BS 7671 IEE Wiring Regulations (current Edition) and the Electricity at Work Regulations (1989) Electricity at Work Regulations ( Northern Ireland ) 1991.
2.0 INSTALLATION DOCUMENTATION
2.1 Diagrams, charts or tables and previous periodic or routine inspection reports should be made available to the Inspecting Engineer, as required by BS 7671.
3.0 METHOD
3.1 To carry out a thorough visual inspection of the electrical installation where practicable with regard to the following:
(a) Safety.
(b) Wear and tear.
(c) Corrosion.
(d) Damage.
(e) Excessive loading (overloading).
(f) Age.
(g) External influences.
(h) Suitability.
3.2 To supplement the visual inspection with such electrical testing as considered necessary for protection against:
(a) Electric shock from direct or indirect contact.
(b) Electric burn.
(c) Fires of electrical origin.
(d) Electrical arcing or explosions initiated or caused by electricity.
4.0 VISUAL INSPECTION
A 100% visual inspection of the fixed electrical installation, including an internal inspection of distribution boards, where practicable to include the following:
(a) Joints and Connections
- Random sample inspection to verify integrity of same, e.g. signs of overheating etc.
- A random 10% in total internal inspection of socket outlets, switching devices and luminaries.
(b) Conductors (Including Protective Conductors)
- Verify suitability, condition and means of identification etc.
- A random 10% in total internal inspection of socket outlets, switching devices and Luminaries.
(c) Flexible Cables and Cords
- Verify suitability and condition.
(d) Switching Devices
- Verify suitability and condition.
- Carry out a random 10% internal inspection.
(e) Protection against Thermal Effects
- Verify presence of fire barriers etc., if reasonably practicable.
(f) Protection Devices
- Verify presence, accessibility, labelling and condition of devices for electrical protection, isolation and switching.
- Fuses, circuit breakers etc., to be checked for correct type and rating, if reasonably practicable.
(g) Enclosures and Mechanical Protection
- Verify suitability and integrity of enclosures for mechanical protection of electrical apparatus and equipment.
(h) Installed machinery/fixed equipment
- An external visual inspection for electrical safety, excluding all control and operational functions.
5.0 TESTING SCHEDULE
5.1 Continuity testing of protective conductors to include: -
(a) Earthling conductors.
(b) Main Equipotent Bonding Conductors.
(c) Supplementary Bonding Conductors.
(d) All circuit protective conductors (sample lighting circuits).
(e) Exposed conductive parts on installed machinery/fixed equipment.
5.2 Polarity Testing
(a) The Polarity will be checked at the meter position
(b) 100% distribution boards where practicable
(c) 100% of socket outlets will be checked to ensure conductors are correctly connected and a 10% random sample of other accessories/equipment.
(d) Single pole control and protective devices are connected in the phase conductors only. (10% random sample to be taken).
(e) Centre contacts of Edison screw type lamp holders have correct connections (10% random sample to be taken).
(f) Multi-pole devices are correctly installed (10% random sample to by taken).
5.3 Earth loop impedance
Earth loop impedance tests to be carried out at locations indicated below: -
(a) At the origin and at each distribution board.
(b) All socket outlets.
(c) Any location, which is exposed to exceptional damage or deterioration or represents a special hazard.
(d) Whilst 100% of fixed equipment is tested for Earth Continuity, a further 10% sample will be checked for Earth Loop Impedance.
5.4 Operating devices for isolation and switching
These are to be checked for effectiveness and to ensure adequate and correct labelling.
5.5 Operation of Residual Current Devices (RCD’s)
100% of RCD’s will be tested for tripping time at half rated, full rated and five times rated tripping current across positive and negative cycles, where practicable.
5.6 Prospective fault current
Tests to be carried out at the origin and at each distribution board.
5.7 Insulation Resistance Testing
Insulation Resistance tests will be carried out at the discretion of the inspecting engineer with due regards to age, condition and visual inspection, up to 10% of the circuits.
From the results of the sample insulation resistance testing, if an unacceptable high failure rate is found further testing will be recommended.
6.0 REPORTING
Reports to be completed using the JMC reporting system.
The reported defects and remedial actions are prioritised as follows:
1. Requires Urgent attention.
2. Requires improvement.
3. Further investigation.
4. Does not comply with current IEE Wiring Regulations.
(This does not necessarily imply that the electrical installation inspected is unsafe.)
7.0 LIMITATIONS
7.1 The inspection and testing will be carried out where practicable at the discretion of the Inspecting Engineer, taking into account availability and accessibility.
7.2 Cables concealed within trunking and conduits, or cables and conduits concealed under floors, in inaccessible roof spaces and generally within the fabric of the building or underground, will not be visually inspected.
7.3 Insulation resistance tests will not be carried out on circuits and/or sections of the installation, which contain electronic or similar sensitive circuitry.
8.0 SPECIFICATION (A.)
8.1 This requires full testing and reporting of each and every circuit in the property. This can be time consuming therefore a bit more expensive.
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