What is the difference between earthing and bonding?

Earthing and bonding are related but distinct concepts. Earthing (or protective earthing) connects exposed metallic parts of electrical equipment — the parts that could become live if a fault occurs — back to the main earthing terminal and thence to the earth, so that fault currents operate protective devices. Bonding connects together metallic services and structural elements that are not part of the electrical installation (gas pipes, water pipes, structural steelwork) to ensure they are all at the same electrical potential, preventing dangerous voltage differences between them. Both are essential for electrical safety.

What services need to be bonded in a domestic property?

BS 7671:2018+A4:2026 (Reg 411.3.1.2) requires extraneous-conductive-parts liable to introduce a dangerous potential difference to be connected to the main earthing terminal. The regulation gives these examples: metallic water installation pipes; metallic gas installation pipes; other metallic installation pipework and ducting (which is where oil service pipes sit); central heating and air conditioning systems; and exposed metallic structural parts of the building. Connection of a lightning protection system to the protective equipotential bonding is made in accordance with the BS EN 62305 series rather than by a plain main bond. Central heating systems fed from a bonded water main do not normally require separate bonding as they are already connected via the pipework, though this should be confirmed on a case-by-case basis.

What size bonding conductor do I need?

The minimum csa of main protective bonding conductors is determined by Reg 544.1.1. On non-PME supplies (TN-S, TT), the bonding conductor must be at least half the csa of the earthing conductor, subject to a minimum of 6mm² copper; it need not exceed 25mm² copper (or equivalent conductance in another metal). On PME/TN-C-S supplies — which is the majority of UK domestic properties — that half rule does not apply: the conductor is sized against the PEN conductor of the supply using Table 54.8. PEN ≤35mm² requires 10mm²; over 35mm² up to 50mm² requires 16mm²; over 50mm² up to 95mm² requires 25mm²; over 95mm² up to 150mm² requires 35mm²; over 150mm² requires 50mm². There is no 25mm² ceiling on a PME supply. In practice, 10mm² is the standard for most domestic TN-C-S supplies. For supplementary bonding between two extraneous-conductive-parts, the minimum is 2.5mm² if mechanically protected or 4mm² if not (Reg 544.2.3).

Is supplementary bonding required in bathrooms?

Supplementary bonding in bathrooms is required by BS 7671:2018+A4:2026 (Reg 701.415.2) unless all three of the following conditions are simultaneously met: (d) all final circuits of the location comply with automatic disconnection per Reg 411.3.2; (e) all final circuits have additional 30mA RCD protection per Reg 415.1.1; and (f) all extraneous-conductive-parts are effectively connected to main protective bonding per Reg 411.3.1.2. All three conditions must be satisfied — meeting only one or two is not sufficient. In practice, a new installation with an all-RCBO consumer unit will typically satisfy all three, allowing supplementary bonding to be omitted. In an older installation with any unprotected circuit, supplementary bonding of all simultaneously accessible metallic parts remains required.

What is the most common bonding defect found on EICRs?

The most common bonding defects found on EICRs are: (1) missing main bonding — often the gas bond or water bond was never installed, or has been removed during meter replacement or plumbing works; (2) undersized bonding conductors — older properties may have 6mm² bonding where 10mm² is now required; (3) bonding connected after an appliance (e.g. after the gas meter rather than before) which means the appliance itself is not bonded; (4) broken or corroded bonding clamps; and (5) missing safety labels on bonding conductors. All of these are typically C2 observations on an EICR, making the report Unsatisfactory.

Where exactly should the gas bonding conductor be connected?

Reg 544.1.2 is the governing regulation. The connection must be made as near as practicable to the point of entry of the gas service into the premises. Where there is a meter, isolation point or union, the connection must be made to the consumer's hard metal pipework and before any branch pipework — not to the gas provider's inlet pipe. Where practicable, the connection must be within 600 mm of the meter outlet union, or at the point of entry to the building if the meter is external. The connection must be made using a suitable bonding clamp that does not damage the pipe. The conductor then runs back to the main earthing terminal (MET) at the consumer unit. The connection point must be accessible and labelled with the safety electrical connection label.

WIRING GUIDE

Bonding Conductors UK Guide: Main and Supplementary Bonding Explained

A complete practical guide to protective bonding conductors in UK electrical installations — main bonding of gas, water and oil services, supplementary bonding in bathrooms, conductor sizing, when bonding can be omitted with RCD protection, and common bonding defects found on EICRs.

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12 min readUpdated 2026-06-10Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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The short answer

What size main bonding conductor do I need?

Except where PME conditions apply, main protective bonding conductors must be at least half the cross-sectional area of the earthing conductor, subject to a minimum of 6mm² (BS 7671 Reg 544.1.1). Where PME conditions do apply — most UK domestic supplies — the conductor is instead sized against the supply PEN conductor using Table 54.8, which gives a minimum of 10mm² for a PEN of 35mm² or less. Supplementary bonding conductors are sized separately under Reg 544.2.

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Key takeaways

01Main protective bonding connects all metallic services entering the building (gas, water, oil pipes) to the main earthing terminal, ensuring they are all at the same potential and preventing dangerous voltage differences between them.
02BS 7671:2018+A4:2026 (Reg 544.1.1) requires main bonding conductors to be at least half the csa of the earthing conductor on non-PME supplies (minimum 6mm², maximum 25mm²), or sized per Table 54.8 against the PEN conductor on PME/TN-C-S supplies — typically 10mm² for domestic PME supplies (PEN ≤35mm²), rising to 16mm² where the PEN is over 35mm² up to 50mm².
03Supplementary bonding in bathroom zones connects simultaneously accessible metallic parts (taps, pipework, radiators, baths, shower trays) to prevent dangerous potential differences within the bathroom.
04Supplementary bonding in a bathroom can be omitted only when all three conditions in Reg 701.415.2 are simultaneously met: (d) all circuits comply with automatic disconnection per Reg 411.3.2; (e) all circuits have 30mA RCD additional protection per Reg 415.1.1; and (f) all extraneous-conductive-parts are effectively connected to main protective bonding per Reg 411.3.1.2.
05Missing or inadequate main bonding is one of the most common C2 observations on EICRs, particularly in older properties where gas or water services have been renewed without reconnecting bonding.
06Bonding conductors must be labelled with the safety label "Safety Electrical Connection – Do Not Remove" (Reg 514.13.1) at: (a) the connection of every earthing conductor to an earth electrode; (b) the connection of every bonding conductor to an extraneous-conductive-part; and (c) the main earthing terminal where it is separate from the main switchgear.

01 · Wiring Guide

What Is Bonding and Why Is It Required?

Protective bonding connects metallic parts of services (gas, water, oil pipes) and structural elements to a common reference point — the main earthing terminal — to ensure they are all at the same electrical potential. Without bonding, a fault in the electrical installation could cause a dangerous voltage difference to appear between, for example, a metal bath (connected to water pipes) and a metal radiator (connected to gas pipework), creating a risk of electric shock to anyone touching both simultaneously.

Equipotential zone — bonding creates an equipotential zone within the building, where all metallic parts accessible to occupants are at the same potential. Even if that potential is raised above true earth during a fault, the absence of a potential difference between simultaneously accessible parts prevents current flowing through a person.
Two types of bonding — BS 7671:2018+A4:2026 distinguishes between main protective bonding (connecting services entering the building to the main earthing terminal) and supplementary bonding (connecting simultaneously accessible metallic parts within specific locations such as bathrooms). Both serve the same fundamental purpose but apply in different contexts.
Mandatory, not optional — bonding requirements in BS 7671:2018+A4:2026 are prescriptive requirements, not recommendations. Missing bonding is consistently recorded as a C2 (potentially dangerous) or C1 (danger present) observation on EICRs, depending on the specific circumstances.

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02 · Wiring Guide

Main Protective Bonding

Main protective bonding conductors connect all metallic services entering the building — gas, water, and oil pipes — to the main earthing terminal (MET) at the consumer unit. The bonding connection must be made as close as practicable to the point where the service enters the building, before any branch or appliance connection.

Gas service — bond to the consumer's hard metal gas pipework as near as practicable to the point of entry, and before any branch pipework. Where there is a meter, isolation point or union, Reg 544.1.2 requires the connection to be made to the consumer's hard metal pipework and, where practicable, within 600 mm of the meter outlet union — or at the point of entry to the building if the meter is external. Where the incoming gas service is plastic and only becomes metallic inside the building, the internal metallic pipe does not normally require main bonding, because it is unlikely to be an extraneous-conductive-part (note to Reg 411.3.1.2).
Water service — bond to the incoming water main as near as practicable to the point of entry into the building, before any branch pipework; where a meter, isolation point or union is present the same 600 mm rule in Reg 544.1.2 applies. As with gas, where the incoming service is plastic and the metallic pipework starts inside the building, that internal pipework does not normally require main bonding — it is unlikely to be an extraneous-conductive-part (note to Reg 411.3.1.2).
Oil service — bond to the oil supply pipework entering the building, as close as practicable to the entry point or the oil storage tank supply connection.
Route to MET — main bonding conductors run directly from each service connection to the main earthing terminal at the consumer unit. They should be installed in a way that minimises damage risk and is accessible for inspection and testing. Where the run crosses walls or passes through hazardous locations, mechanical protection should be provided.

The "insulating section exemption" no longer exists — check the current wording

The original BS 7671:2018 (18th Edition) text allowed a metallic pipe entering the building with an insulating section at its point of entry to be left out of the protective equipotential bonding. That wording is no longer in the standard. Reg 411.3.1.2 was redrafted at Amendment 2:2022 and the reference to insulating sections was removed; it has not returned in BS 7671:2018+A4:2026. The current test is the one in Reg 411.3.1.2 itself: extraneous-conductive-parts liable to introduce a dangerous potential difference shall be connected to the main earthing terminal. What the standard does now say, in the note to Reg 411.3.1.2, is that where non-metallic pipes (for example plastic) enter the building and are then connected to metallic pipes inside it, the internal metallic pipes do not normally require protective bonding, because they are unlikely to be extraneous-conductive-parts. Decide by assessing whether the part can actually introduce a potential — not by looking for an exemption clause that has been deleted.

03 · Wiring Guide

Main Bonding Conductor Sizing

The minimum cross-sectional area (csa) of main protective bonding conductors is governed by Reg 544.1.1. The rule differs depending on whether PME (TN-C-S) or non-PME earthing applies:

Table 54.8 — PME main bonding conductor sizing

Minimum main bonding conductor vs the supply PEN (neutral) conductor — BS 7671 Reg 544.1.1

Supply PEN (Cu equiv)

Min main bonding

≤ 35 mm²

10 mm²

over 35 up to 50 mm²

16 mm²

over 50 up to 95 mm²

25 mm²

over 95 up to 150 mm²

35 mm²

over 150 mm²

50 mm²

Most UK domestic PME supplies use a 16–25 mm² PEN, so 10 mm² is the standard main bonding size. Non-PME (TN-S/TT): at least half the earthing-conductor csa, minimum 6 mm² (Reg 544.1.1).

Non-PME supplies (TN-S, TT) — the bonding conductor must be at least half the csa of the earthing conductor of the installation, subject to a minimum of 6mm² and a maximum of 25mm² copper-equivalent (Reg 544.1.1).
PME / TN-C-S supplies — the bonding conductor is selected against the PEN conductor of the supply using Table 54.8: PEN ≤35mm² → 10mm²; PEN >35mm² up to 50mm² → 16mm²; PEN >50mm² up to 95mm² → 25mm² (Reg 544.1.1 / Table 54.8).

Most UK domestic properties are supplied on PME (TN-C-S) with a PEN conductor of 16mm² or 25mm², so 10mm² is the standard main bonding conductor size. The 6mm² minimum is the absolute floor and applies only to non-PME installations with a small earthing conductor — where in doubt, 10mm² should always be used.

Typical domestic PME supply (PEN ≤35mm²) — a standard 100A single-phase domestic TN-C-S supply uses a PEN conductor of 16mm² or 25mm². Table 54.8 (Reg 544.1.1) requires a minimum 10mm² main bonding conductor for these supplies. This is the most common bonding conductor size for domestic properties in the UK.
Larger PME supplies (PEN >35mm² up to 50mm²) — where the network PEN conductor exceeds 35mm² (common for larger commercial premises or upgraded domestic supplies), Table 54.8 requires 16mm² main bonding conductors. Using 10mm² in this situation would be undersized and is typically flagged C2 on an EICR.
Non-PME supplies (TN-S, TT) and the 6mm² minimum — on non-PME supplies the bonding conductor is sized at half the csa of the earthing conductor, with a floor of 6mm² copper. This applies only to TN-S or TT installations; the overwhelming majority of UK properties are PME (TN-C-S) and so use Table 54.8. Never specify 6mm² on a standard PME domestic supply: it will typically be flagged C2 on the next EICR.
Older installations with 6mm² — many older properties have 6mm² main bonding conductors installed to a previous edition's minimum. On a standard PME (TN-C-S) supply, Reg 544.1.1 / Table 54.8 requires 10mm² where the PEN conductor is ≤35mm². A 6mm² conductor on such a supply is undersized and is commonly observed as a C2 during EICRs.

04 · Wiring Guide

Size Your Bonding Conductor

Enter the supply PEN or earthing conductor and the tool applies Table 54.8 or the half-the-earthing-conductor rule of Reg 544.1.1. There is a second field for the conductor that is actually installed, so you can check an existing bond rather than only size a new one. Free, no sign-up.

Bonding Conductor Size Calculator

Main and supplementary protective bonding to BS 7671 Reg 544 and Table 54.8

What are you sizing?

Earthing arrangement

Supply PEN conductor (mm²)

What is actually installed? (mm²)

mm²

Measure or read the existing conductor to check it against the minimum

Minimum size

10 mm²copper

PEN 25 mm² → 10 mm² minimum

Where PME conditions apply the main bonding conductor is selected from the PEN conductor of the supply and Table 54.8 — it is not a fraction of the earthing conductor.

Reg 544.1.1 and Table 54.8

Table 54.8 NOTE: the local distributor's network conditions may require a larger conductor — check with the DNO before finalising.

Where an installation has more than one source of supply under PME conditions, size on the LARGEST PEN conductor (Reg 544.1.1).

05 · Wiring Guide

Supplementary Bonding in Bathrooms

Supplementary protective bonding is required in bathrooms and other specified locations to connect all simultaneously accessible metallic parts within the location, ensuring no dangerous potential differences exist between them. Bathrooms are the most common location requiring supplementary bonding in domestic installations.

What must be bonded — in a bathroom, supplementary bonding connects: metal baths and shower trays, exposed metallic taps and pipework, metal radiators and heated towel rails, and the earth terminals of all fixed electrical equipment within the bathroom (electric shower, extractor fan, shaver socket, towel rail). All parts that a person could simultaneously touch must be bonded together.
Conductor sizing — a supplementary bonding conductor connecting two extraneous-conductive-parts (for example pipe to pipe) must be a minimum of 2.5mm² if sheathed or otherwise mechanically protected, or 4mm² if not (Reg 544.2.3). Where the conductor connects an exposed-conductive-part to an extraneous-conductive-part it must instead have a conductance not less than half that of the protective conductor connected to the exposed-conductive-part, and still not less than 4mm² if unprotected (Reg 544.2.2).
Zones — BS 7671:2018+A4:2026 Section 701 defines zones within bathrooms (Zone 0, 1, 2, and outside zones) based on proximity to the water source. The zone designation affects what electrical equipment can be installed, but supplementary bonding applies to all metallic parts accessible within and near the bathroom regardless of zone.
Door architraves and window frames — not extraneous-conductive-parts — Reg 701.415.2 expressly states that metallic door architraves, window frames and similar parts are not considered extraneous-conductive-parts requiring supplementary bonding unless they are connected to metallic structural parts of the building. Do not bond these items unless they are genuinely structurally connected — unnecessary bonding of non-extraneous parts is a common on-site error and adds cost without safety benefit.

06 · Wiring Guide

When Supplementary Bonding Can Be Omitted

BS 7671:2018+A4:2026 (Reg 701.415.2) allows supplementary bonding to be omitted in a bathroom, but only where the building already has a main protective equipotential bonding system in accordance with Reg 411.3.1.2 and all three of the following conditions are simultaneously met:

Condition (d) — automatic disconnection (Reg 411.3.2) — all final circuits of the location shall comply with the requirements for automatic disconnection according to Reg 411.3.2 (i.e. fault loop impedance Zs is within the limit for the protective device).
Condition (e) — 30mA RCD additional protection (Reg 415.1.1) — all final circuits of the location shall have additional protection by a residual current device with a rated residual operating current not exceeding 30mA. This includes not just the bathroom lighting and shower circuits, but every circuit that could introduce a potential difference into the bathroom.
Condition (f) — main equipotential bonding (Reg 411.3.1.2) — all extraneous-conductive-parts of the location shall be effectively connected to the main protective equipotential bonding. Meeting this condition requires that main bonding of all incoming metallic services is intact and compliant.
All three conditions must be met simultaneously — failure on any one condition means supplementary bonding is still required. In a new installation with an all-RCBO consumer unit where all three conditions are satisfied, supplementary bonding can be omitted. In an older installation with any unprotected circuit, supplementary bonding remains necessary.
Main bonding still required — the omission of supplementary bonding does not affect the requirement for main protective bonding of incoming services (gas, water, oil). Main bonding is always required regardless of RCD protection.

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07 · Wiring Guide

Common Bonding Mistakes

Bonding errors are among the most frequently observed defects on EICRs. Understanding the common mistakes helps electricians avoid them in new work and identify them correctly during inspections.

Bonding after the meter — connecting the gas or water bond downstream of the meter means the meter body itself is not bonded. The bond must be applied to the consumer's pipework, typically just after the meter on the consumer's side.
Bonding to the wrong point — bonding the gas pipe to an earthing conductor in a socket circuit rather than to the main earthing terminal directly is incorrect. All main bonding conductors must run back to the MET at the consumer unit.
Assuming continuity across plastic inserts — plastic isolating sections in gas or water pipework (installed to prevent galvanic corrosion) break the metallic continuity of the pipe, so a bond applied on one side does not carry across to the other. Each separated section has to be assessed on its own against the test in Reg 411.3.1.2: bond it if it is an extraneous-conductive-part liable to introduce a dangerous potential difference. A section that is genuinely isolated from earth by the insert will not normally meet that test, so do not bond every length reflexively — establish first whether it can introduce a potential.
Missing safety labels — BS 7671 Reg 514.13.1 requires a warning notice "Safety Electrical Connection – Do Not Remove" to be securely fixed in a visible position at or near each bonding connection to an extraneous-conductive-part (and at the earthing conductor-to-electrode connection and at any separate main earthing terminal). Missing labels are commonly recorded as a C3 (improvement recommended) observation on an EICR.
Poor bonding clamp contact — bonding clamps that are incorrectly sized for the pipe diameter, poorly tightened, or applied over paint or corrosion may not make reliable electrical contact. The bonding continuity test will reveal high resistance at a defective clamp.

08 · Wiring Guide

Bonding Clamps and Connection Requirements

The quality and type of the bonding clamp is critical to reliable bonding. A poor connection creates high resistance in the bonding path, which defeats the purpose of the bonding installation.

Clamp types — BS 951 (Electrical earthing. Clamps for earthing and bonding. Specification) is the product standard for earthing and bonding clamps and is the clamp BS 7671 refers to at Reg 514.13.1; a BS 951 clamp is the normal choice for gas and water pipes. Clamps must be sized to suit the pipe diameter and must not damage the pipe, and must make direct metal-to-metal contact with the pipe surface.
Surface preparation — paint, lacquer, or corrosion on the pipe surface at the clamp contact point must be removed before fitting the clamp. A poor surface contact is one of the most common reasons for high-resistance bonding connections found during EICR testing.
Gas safety — when fitting a bonding clamp to a gas pipe, ensure the work is carried out by a Gas Safe registered engineer or by an electrician working on the electrical bonding only (not the gas pipework itself). The clamp must not damage the pipe or its protective coating.
Safety labelling — fit a "Safety Electrical Connection – Do Not Remove" notice to the bonding clamp and conductor at each connection point (Reg 514.13.1). The notice is also required at any earthing conductor-to-electrode connection and at the main earthing terminal if it is separate from the main switchgear. BS 7671 expressly allows the notice to be provided on the clamp itself where the clamp is to BS 951, or on the warning label supplied with it. The label also alerts future workers (gas fitters, plumbers) not to disconnect the bonding.

09 · Wiring Guide

Bonding Defects on EICRs — Observation Codes

Bonding defects are among the most commonly observed items on EICRs for older domestic properties. Understanding how to classify bonding defects correctly ensures accurate and consistent reporting.

C2 — Missing main bonding — absent gas or water bonding conductors are typically C2 (potentially dangerous) as they leave metallic services at an indeterminate potential relative to the installation's earth. Under certain fault conditions, this could produce a dangerous touch voltage.
C2 — Undersized bonding conductors — bonding conductors below the minimum csa required by BS 7671 for the supply size are typically C2. The undersized conductor may not be capable of carrying the fault current required to operate the protective device within the disconnection time.
C3 — Missing safety labels — absent bonding conductor labels are typically C3 (improvement recommended) as the lack of labels does not immediately create an electrical hazard but could lead to the bonding being disconnected inadvertently by uninformed workers.
FI — High continuity resistance — where the bonding conductor and clamp appear to be present but the continuity resistance measurement is high (above approximately 0.05 ohms), this should be recorded as FI (Further Investigation) or C2 depending on the resistance value and circumstances.

10 · Wiring Guide

For Electricians: Testing and Certification of Bonding

Bonding continuity must be tested and recorded during both new installation commissioning and EICR inspections. The test verifies that a low-resistance path exists between bonded parts and the main earthing terminal.

Record Bonding Results on Certificate

Main bonding continuity resistance values must be recorded on the Schedule of Test Results on the EIC or EICR. Typical acceptable values are below 0.05 ohms for a well-installed bonding conductor. Use the Elec-Mate EICR app to record bonding test results on site and generate a compliant PDF instantly.

New Installation Bonding

When installing a new consumer unit, always check for and install main bonding conductors to all incoming metallic services. Quote for bonding as a standard item of every consumer unit replacement — the small additional cost prevents a C2 observation on the next EICR and ensures the installation is safe from day one.

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Main Bonding Conductor Size Guide (BS 7671)

Main and supplementary bonding conductor sizes to BS 7671: minimum cross-sectional area by earthing arrangement and supply, with a sizing table.

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