IN Brief:
- BS 7671 Amendment 4 introduces a major revision to Section 710 on medical locations.
- The changes include new requirements for recording supplementary protective equipotential bonding conductor resistance.
- The previous BS 7671 edition is due to be withdrawn six months after Amendment 4 implementation.
BS 7671 Amendment 4 introduces significant changes to electrical testing and documentation in medical locations, with revised requirements affecting Section 710 of the Wiring Regulations.
Amendment 4 to BS 7671:2018 can be implemented from 15 April 2026, with the previous edition, BS 7671:2018+A2:2022+A3:2024, due to be withdrawn six months later. The update includes a major revision of Section 710, which covers electrical installations in medical locations.
Medical locations include hospitals, clinics, dental practices, healthcare centres, and dedicated medical rooms in workplaces. The requirements are more demanding than standard commercial installations because patients may be more vulnerable to electric shock, particularly during invasive procedures, anaesthesia, or intensive monitoring.
Section 710 divides medical locations by risk. Group 2 areas, including operating theatres and other locations where applied parts are used for vital treatment, require particular care in design, installation, testing, and verification. Electrical continuity, equipotential bonding, supply reliability, and fault protection all connect directly to patient safety.
A key change under Amendment 4 is the inclusion of a schedule of test results for recording the resistance of supplementary protective equipotential bonding conductors. The revisions require more detailed evidence of bonding conductor performance, including individual resistance measurements and compliance with the specified limit.
The changes will affect electrical contractors, test engineers, designers, facilities teams, and healthcare estates departments involved in new installations, alterations, and periodic inspection and testing. Contractors working outside healthcare may also encounter Section 710 where workplaces include dedicated medical rooms or treatment spaces.
The revised medical location requirements sit alongside other Amendment 4 changes, including provisions for stationary secondary batteries, functional earthing and equipotential bonding for information and communications technology equipment and systems, and power over Ethernet. Wider competence and verification concerns are already prominent across the sector, with SELECT securing MSP backing for electrician regulation as part of the continuing debate around electrical safety standards.
The practical effect of the Section 710 changes will be felt in documentation as much as installation. Testing in medical environments already requires stronger evidence because bonding, isolation, supply continuity, and protective measures must be demonstrable. More specific resistance recording should make inspection records clearer and reduce ambiguity during certification, review, and maintenance.
Healthcare estates are also becoming more electrically intensive. Diagnostic equipment, surgical systems, IT infrastructure, backup power, building management systems, and battery-backed equipment all increase the complexity of medical electrical installations. As clinical spaces become more dependent on interconnected electrical systems, testing records need to provide a stronger audit trail.
The transition period will require careful coordination. Projects specified under the previous edition may need review where design, installation, testing, or certification overlaps with the implementation and withdrawal dates. Designers, installers, clients, and inspectors will need to agree the applicable standard early enough to avoid late-stage compliance issues.
Amendment 4’s medical location revisions place greater weight on recorded bonding performance and strengthen the documentation trail behind safe healthcare electrical installations. In high-risk electrical environments, compliance depends on measurable evidence, not assumed continuity.
