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BSI 62485:2018 and BS 7671:2018

Published by Jason Koffler on 19 June 2019

UPS and Battery Installations in accordance with BSI 62485:2018 and BS 7671:2018 – Stay Safe and Keep Your Electrical Installation within best practice.

Installing a UPS (uninterrupted power supply) system can be a substantial project but can bring with it many benefits including taking control of your power. In addition to protecting against power surges, a UPS can also help you avoid voltage drops or frequency distortion and provided extended runtime in the event of prolonged power loss. In fact, UPS Systems these days are so efficient that they can be as high as 99% Efficient in ESS mode, reducing your power and cooling energy costs and carbon foot print.

The BS62485 and BS 7671:2018 18th Edition regulations need to be taken into account when installing and operating UPS systems. These regulations were released by the Institution of Engineering and Technology (IET) and the British Standards Institution (BSI) to reflect changes in the industry and promoted best practive.
They are designed to keep you safe while ensuring all electrical operation runs are legal, efficient and keep you safe.

Why BSI EN IEC 62485:2018 and BS 7671:2018 Important

In addition to safety, BS 7671:2018 and BSI EN IEC 62485:2018 regulations cover the correct installation of UPS systems and in the case of 62485-1:2018 battery installations, as well as other electrical equipment. Standby Power makes managing an entire business easier because it alleviates the worry of electrical problems occurring or propagating through the electrical network while ensuring all business processes will continue even in the face of a problem that could otherwise interrupt them.

Ensuring correct installation of UPS systems will avoid further issues and reinstallations down the line. It’s much easier to conduct proper project management ensuring on time delivery of a project and safer user operation when both BS EN IEC Standards are taken into account.

BS 7671:2018 18th Edition Changes

The BS 7671:2018 18th Edition includes many significant changes that help improve safety and efficiency both in terms of electrical and UPS installations. Adhering to these changes will also ensure all national and international standards are met.

The new IET wiring regulations were published on July 2nd, 2018 and took affect January 1st, 2019. These new requirements are as follows.

All installations occurring after December 31, 2018 are required to comply with the new changes from BS7671: 2018. This includes the design, erection and verification of all electrical installs as well as alterations and additions to installations already in existence. Those installs that were put in place prior to this date that met with earlier regulation editions will not necessarily comply completely with the new regulations.

This, however, does not necessarily indicate a lack of safety for users or that upgrades are required.
One modification occurs with Regulation 133.1.3 regarding the selection of equipment. The new change now requires a statement to be added to the electrical installation certificate. Also, definitions were modified and expanded to ensure clarity.

Chapter 41 covers protection against electrical shock and includes a change in Section 411 concerning metallic pipes with an insulated section where they enter a building do not need to be connected to the protective equipotential bonding.

Changes to this section are also included regarding the maximum disconnection time which is stated in Table
41. This disconnection time now applies to final circuits up to 63 A with one or more socket-outlets and only 32 A for final circuits that supply fixed connected current that uses equipment.
Regulation 411.3.3 was revised to apply to socket-outlets that have a rated current that doesn’t exceed 32A.
An exception exists that omits RCD protection where, in locations other than a dwelling, a risk assessment has been performed and documented determining RCD protection isn’t necessary.

There is a new regulation, 411.3.4, that requires additional protection within a household by an RCD that has a rated residual operating current that doesn’t exceed 30 mA. This protection is to be provided for AC final circuits that supply luminaires.

Changes in Regulation 411.4.3 include a stipulation that no isolating or switching device be inserted in a PEN conductor. Likewise, regulations 411.4.4 and 411.4.5 were completely redrafted while regulations 411.6 regarding IT systems underwent reorganization.

Regulations 411.6.3.1 and 411.6.3.2 were removed. Regulations 411.6.4 were redrafted, and Regulation 411.6.5 was added.

An altogether new regulation group, 419, was added, and specifies that automatic disconnection according to Regulation 411.3.2 is not feasible. This includes electrical equipment with short-circuit current that is limited.

Chapter 42 provides regulations regarding protection against thermal effects. A regulation, 421.1.7, was added to recommend the installation of arc fault detection devices. This addition is designed to mitigate the risk of a fire occurring in AC final circuits of a fixed installation because of the effects of arc fault currents.

Regulation 422.2.1 was completely redrafted while all references to conditions BD2, BD3 and BD4 were deleted. A note specifying the need for cables to satisfy the CPR requirements in respect to their reaction to fire was added. This note also references Appendix 2, item 17. Also included are requirements for cables that supply safety circuits.

Chapter 44 addresses protection against voltage and electromagnetic disturbances and contains Section 443 which stipulates protection against overvoltages of atmospheric origin as well as switching. This section was completely redrafted.

The AQ criteria, which refers to conditions of external influence for lightning, is no longer included. This criteria is used to determine whether protection against transient overvoltages is necessary. Instead, protection against these transient overvoltages must be provided where the consequence it caused resulted in serious injury, the loss of a human life or the interruption of vital public services. Commercial and industrial activity are also not to be interrupted.

A risk assessment must first be performed to determine whether protection against transient overvoltage is a requirement.

Understanding the BS 7671:2018 Regulations

The regulations listed here represent just a few of the changes that come with the latest edition, BS 7671:2018. These regulations are important because they address both the safety and effectiveness of electrical installations, resulting in a more streamlined workflow.

There are also several other areas that have seen similar changes, all of which seek to achieve the goals of safety and protection. Adhering to these standards will result in a more effective installation and help you gain a more thorough understanding of how the entire process works from start to finish. To learn more about the changes, get in touch with our team today.