1. Amendments to part PART 4
There are changes to tables 41.2 & 41.4 due to new fuse standards being introduced:
Old BS 1361 changed to BS 88-3
Old BS 88-2-2 changed to BS 88-2
Old BS 88-2-6 changed to BS 88-2
The effects of these changes are:
• Some Zs values are different
• Withdrawal of certain protective device ratings i.e. 15A devices
• Some time current tables in Appendices are altered
New Section 444- Measures against electromagnetic disturbances.
This new electromagnetic disturbances section provides recommendations to enable the avoidance and reduction of
Electromagnetic Interference (EMI).
Electrical installations which include sources of electromagnetic disturbances could be transformers, Welding machines,
electric motors, fluorescent lighting and where switching of inductive loads could cause EMI. Also includes routing of
cables and inducing of voltages.
Recommendations also cover installations where EMI may disturb or damage IT systems/equipment and electronic
circuits and components.
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New section 534- Devices for protection against overvoltage. Selection of Surge Protection Devices (SPD).
Transient overvoltages or surges could come from lightning or switching of electrical circuits.
This amendment includes requirements for the installation of Surge Protection Devices (SPDs) and filters to limit
transient overvoltages and divert damaging surge current away from sensitive equipment such as computers and
electronic circuits.

2. More info about Surge Protection Devices.
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New section 710- Medical Locations
This section involves the safety of patients likely to be subjected to the application of electrical medical equipment in
medical locations such as hospitals and dental practices. This includes shock protection and secure supplies for life
support. Section 710 also segregates medical locations into 3 groups 0,1 and 2.
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New section 729- Operating or Maintenance Gangways.
Mainly concerning Electrical Switch rooms and Restricted Areas. This amendment ties in with Regulation 15 of the
Electricity at work Regulations and includes requirements for working space, gangway width, operational access,
emergency access, and emergency evacuation.
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Appendix 6- New Model Forms for Certification and Reporting.
This amendment brings in the new Electrical Installation Condition Report which replaces the Periodic Inspection
Report. More information on the new Electrical Installation Condition Report.
Minor Works amendment NOT introduced.
Note- There were to be changes regarding exceptions to RCD protection where Minor Works are carried out and where
SELV and PELV cables are concealed in walls. The important thing to know is that these ”proposed” changes
(mentioned in the video) were withdrawn and don’t feature in the amendments.
On-Site Guide and Guidance Notes
The amended On-Site Guide and Guidance books associated with BS7671 Amendment 1 are due to be published on the
following dates:
On-Site Guide- October 2011
Guidance Note 7- January 2012
Guidance Note 1- February 2012
Guidance Note 3- March 2012
Guidance Note 2- April 2012
Guidance Note 4- April 2012
Guidance Note 8- April 2012

3. Electrical Installation Design Guide: Calculations for Electricians and Designers- April 2012
Guidance Note 5- May 2012
Guidance Note 6- May 2012
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