BS7671:2008 Amendment 1 Update
BS7671 will continue to be amended from time to time to take account of the publication of new or amended CENELEC standards. Regulations are revised to allow for new technology and methods. Technological advancements, better practices of work and the objective of creating harmonized European Technical Standards means that between editions, the regulations need to be updated and improved. The standardization system aims to increase market potential, encourage technological development and guarantee the safety and health of consumers and workers, as well as to contribute to a greener world.
What are the changes?
Some of the changes are as follows:
New numbering system – UK only regulations
To accommodate future IEC changes it has been decided to have a “100” numbering system for UK only regulations: for example BS 7671: 2008 regulation 522.6.5, which is a UK only regulation, will become 522.6.100.
Protection for safety – Part 4
A restructuring has occurred within fuse-standard committees resulting in a number of changes which will affect BS7671.
BS1361 has been withdrawn and replaced by BS 88-3
BS88-2-2 (bolt in) and BS 88-2-6 (clip in) have been withdrawn and replaced by BS88 -2
Consequently, due to this some values of maximum earth fault loop impedance in tables 41.2 and 41.4 will see changes.
Currently BS7671:2008 Part 4 section 444 highlights the future intention to protect against Electromagnetic Influences within buildings. Now that the first amendment is about to be published in line with Measures Against Electromagnetic Disturbances, designers need to begin applying this protection in buildings of multiple floors.
Electromagnetic disturbances, also known as electromagnetic interference (EMI) may interfere with or damage IT systems, equipment or electronic components and circuits. Disturbances appear as an electric current causing a change in the strength of its associated electromagnetic field which can induce voltages and currents in other conductors sited within the field. Typical sources for these disturbances include:
Switching devices for inductive loads,
Incorporate a Bonding Network comprised of protective conductors and multiple meshed bonding
The use of surge protection devices and /or filters
The routing of conductors to avoid inductive loops.
Separation of power and signal cables applied in three dimensions.
Devices for protection against overvoltage – section 534 (new)
This deals with protection against overvoltages from lighting strikes, HV switching on the distribution network and switching of inductive loads. Protection in these areas can be given in the form of surge protection devices (SPD’s).
Special installations or locations – Part 7
Two new sections have been added to part 7, these are medical locations (section 710) and operating or maintenance gangways (section 729)
Section 710 applies to hospitals, private clinics, medical and dental practices, healthcare centres and dedicated medical rooms in the workplace.
Section 729 is intended to provide a safe working environment for those skilled or instructed persons working in areas where, historically, not much space has been allocated e.g. switch rooms.
Inspection and testing – Part 6
Very important changes have been made to the reports issued when a periodic inspection is carried out, the new terminology for this report is “Electrical installation condition report”.
These changes are intended to convey to the customer exactly what the report is and what it does and will be much more descriptive than the previous “Periodic inspection report”.
A change has also been made to the way observations or non-compliance's are treated.
The new codes are:
C1 – Danger present, risk of injury, immediate remedial action required.
C2 – Potentially dangerous, urgent remedial action required.
C3 – Improvement recommended.