MCS standards
MCS solar installation standard tightens again with MIS 3002 issue 6.0, documentation is the theme, not relaxation
MIS 3002 issue 6.0, available for reference from 18 March 2026, is the latest update to the MCS Solar PV Installation Standard, and every recent revision in this cycle has moved toward more rigorous documentation and stricter mounting requirements, not fewer.
28 July 2026 · Source: MCS (mcscertified.com)
The pattern across the last few MCS revisions is consistent enough to call a direction of travel: issue 6.0 tightens documentation and design requirements rather than simplifying them, continuing from the 2025 update that already introduced flat-roof mounting rules and DC circuit changes covered on our own guide to that revision. Anyone expecting MCS paperwork to get lighter over time should recalibrate that expectation.
One specific, dateable change worth flagging directly: from 10 August 2025, any solar system installed on a flat roof must use a mounting system that is itself MCS 012 certified, not just an MCS-certified installer using an uncertified mount. That is a real gap some installers have been caught out by, since it applies to the hardware, not only the workmanship, and it is worth confirming explicitly with any installer quoting a flat-roof job in Kent.
The wider electrical backdrop matters too. BS 7671 Section 712, the wiring regulations chapter that underpins MCS electrical compliance for solar specifically, was extensively revised and expanded under the A4:2026 amendment. Section 712 covers earthing arrangements, DC isolation, and fault protection for PV systems, so an amendment of this scope is not a minor housekeeping update, it changes what a compliant installation actually looks like on the ground.
Watch how certification bodies handle the migration. MCS itself describes issue 6.0 as part of a broader scheme redevelopment rolling through 2026, with certification bodies migrating installers in a phased approach rather than all at once, so a legitimate MCS installer quoting today may still be certified to issue 5.0 depending on where their certification body is in that migration. If you're getting quotes, it is a fair question to ask which issue an installer is currently certified against.
Read the original: MCS (mcscertified.com). Commentary is Sandwich Solar's own editorial view; the original reporting is credited to its publisher.
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