We use more electricity worldwide than ever before, to ‘power our lives’ and provide us with evermore convenience. That’s reason enough for the safety and reliability of our electrically powered installations to be more important than ever.
That’s where BS 7671:2018 comes in – the British Standard for electrical installations.
This guide explains the importance of the wiring regs in ensuring that everyone, from electricians to building owners, has the information they need to meet regulatory standards.
Whether you’re a seasoned professional or just starting in the electrical industry, understanding BS 7671:2018 is essential for creating effective and secure installations.
In this article, we dive into the essential requirements outlined in BS 7671:2018. to explore how they help ensure our electrical installations meet the highest safety and reliability standards.
What is the 18th Edition?
The 18th Edition of the IET Wiring Regulations, also known as BS7671, is the current British standard for installing electrical wiring.
The standard applies to the design, erection and verification of electrical installations, including any additions and alterations, to existing installations across domestic, commercial, and industrial settings.
In its physical form, you get a current edition of the book containing electrical installation requirements covering safety, efficiency, and compliance with regulatory standards.
In the UK electrical industry, it is considered one of the essential pieces in the electrical safety puzzle.
The History of BS7671
BS7671 has been around for over a century, with the first Edition being published in 1882.
Since then, there have been several updates and revisions, with the latest Edition (18th Edition) being published in 2018.
The BS7671 standard is reviewed and updated every few years to ensure it remains up-to-date with the latest technology and safety practices.
Why is the 18th Edition so important?
18th Edition is an important document because it provides you with a comprehensive set of guidelines and requirements for the safe installation of electrical wiring.
Without this guide, electrical installers may not meet current standards, resulting in unsafe and inefficient installations.
Is BS 7671 a legal requirement for an electrical installation?
No, however, many significant health and safety and building regulations specify that the standard must be met.
It is critical to understand that you could be prosecuted for non-compliance with the regulations as a result of not adhering to the UK’s Health & Safety at Work Act section 17 and the 1989 Electricity at Work Regulations.
What if an installation doesn’t meet the standard?
It is important to note that existing installations installed in accordance with earlier editions may not comply with the 18th Edition in every respect.
This does not automatically mean they are unsafe for continued use or require upgrading.
Do I need the 18th Edition qualification?
It is not a mandatory requirement for electricians to be certified under the 18th edition wiring regulations. However, there are several reasons why you may decide you need the qualification:
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Many find accreditation beneficial as it means they can self-certify compliance.
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If you want to register on the competent person scheme, it is mandatory that you provide evidence of your up-to-date 18th edition qualification.
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To work in the electrical industry and have access to plenty of work, you will likely need the 18th Edition qualification. Most contractors and agencies require that you have evidence of having completed an 18th Edition course attendance in order to work for them.
Key Point: The 18th edition qualification does not make you a qualified electrician.
How to Become an Electrician
According to the National Careers Service, you can take several routes to become an electrician in the UK. They include:
- a college course
- an apprenticeship
- getting accredited through ‘experienced worker assessment’
- applying directly based on existing experience
The Main Changes made in the 18th Edition of BS7671
The 18th Edition of BS7671 includes several important changes, including changes to the requirements for protection against:
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electric shock, including the addition of new requirements for RCDs (residual current devices)
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against fire and heat, including the introduction of new requirements for fixed heating and air-conditioning systems
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overcurrent, including the addition of new requirements for solar photovoltaic (PV) systems
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physical damage, including the introduction of new requirements for cable management
Requirements for Protection Against Electric Shock
The 18th Edition of BS7671 includes several requirements for protection against electric shock. These include:
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The use of RCDs (residual current devices) to detect and interrupt any current leakage to earth
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The use of protective devices, such as fuses and circuit breakers, to protect against overcurrents and short circuits
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The use of earthing and bonding to ensure that electrical systems are properly connected to earth
Requirements for Protection Against Fire and Heat
The 18th Edition of BS7671 includes several requirements for protection against fire and heat. These include:
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The use of fire-resistant cables to minimise the spread of fire
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The use of fire-resistant barriers to prevent the spread of fire and smoke
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The use of fire-resistant materials in the construction of electrical equipment and enclosures
Requirements for Protection Against Overcurrent
The 18th Edition of BS7671 includes several requirements for protection against overcurrent. These include:
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The use of protective devices, such as fuses and circuit breakers, to protect against overcurrents and short circuits
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The use of overcurrent protection devices to protect against overcurrents and short circuits
Requirements for Protection Against Physical Damage
The 18th Edition of BS7671 includes several requirements for protection against physical damage. These include:
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The use of durable materials for electrical equipment and enclosures to protect against damage from impact, vibration and corrosion
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The use of cable management systems to protect cables and wiring from damage
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The use of labelling and identification to clearly identify different circuits and equipment
Requirements for Earthing and Bonding
The 18th Edition of BS7671 includes several requirements for earthing and bonding. These include:
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The use of earthing and bonding to ensure that electrical systems are properly connected to earth
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The use of protective conductors to provide a low-impedance path to earth
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The use of equipment earthing to protect against electric shock
Requirements for Isolation and Switching
The 18th Edition of BS7671 includes several requirements for isolation and switching. These include:
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The use of isolating and switching devices to enable the safe isolation of electrical circuits and equipment
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The use of main switch and main equipotential bond to provide a means of isolation from the main electrical supply
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The use of an emergency switch to provide a means of disconnection for emergency services
Requirements for Wiring Systems
The 18th Edition of BS7671 includes several requirements for wiring systems. These include:
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The use of suitable wiring methods, such as conduit and trunking, to protect cables and wiring from damage
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The use of suitable cable types, such as PVC and XLPE, to protect against fire and heat
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The use of suitable cable sizes to ensure that cables are capable of carrying the required current
What is the 18th edition amendment 2?
The 18th edition amendment 2 of BS7671 brings additional changes and updates to the standard.
Some of the main changes brought by amendment 2 include changes to the requirements for:
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Residual Current Devices (RCDs): including the need for RCD protection on all lighting circuits and the requirement for RCDs to be tested more frequently.
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Emergency lighting: including the need for emergency lighting to be provided in all escape routes, and the requirement for emergency lighting to be tested more frequently.
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Electrical vehicle charging systems: including the need for these systems to be protected by RCDs, and the requirement for these systems to be tested and inspected more frequently.
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Solar photovoltaic (PV) systems: including the need for these systems to be protected by overcurrent protection devices and the requirement for these systems to be tested and inspected more frequently.
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Earthing and bonding: including the need for supplementary equipotential bonding for certain equipment and systems.
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Protection against physical damage: including the requirement for electrical equipment to be protected from impact, vibration, and corrosive environments.
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Inspection and testing: including the requirement for an initial verification to be carried out on new installations and the requirement for regular periodic inspection and testing on existing installations.
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Electric vehicle charge points: including a new requirement for EV charge points to be connected to a meter for the purpose of billing and tariffs, limits for connecting and disconnecting EVSE
Key Point: It’s important to note that amendment 2 supplements the 18th Edition. Therefore, it’s critical for you to follow the guidelines and requirements set out in both the main standard and the amendment in order to ensure compliance and safety.
Remember that this standard is also subject to update, so keeping updated with the latest version of the amendment and standard is important.
Conclusion
18th Edition (BS7671) is the current British standard for safe electrical wiring installation, ensuring electrical systems function correctly and efficiently.
It’s important for electricians and other professionals in the electrical industry to stay up-to-date with the latest Edition of BS7671 to ensure that they are aware of the latest safety practices and requirements.
