Issued: April 2025
Audience: Domestic & Commercial Installers of FoxESS Energy Storage Systems
Summary of Key Requirements (UK: IET CoP, MCS, PAS 63100)
| Topic | Requirement |
| IEC 62933 (System Safety) | Not required for separate systems (e.g. EP + H1). Mark as N/A on commissioning docs. |
| IEC 62619 (Battery Safety) | Fully valid for domestic and industrial installs. Exceeds IEC 63056 requirements. |
| Arc Flash Risk Assessment | FoxESS responsible for AIO systems (e.g. PowerQ, EVO). Installer assesses for hybrids. |
| PAS 63100 Commissioning | Required in domestic installs. Referenced by IET CoP (Table 13.2, Pg 130). |
Clarification on IEC 62933
IEC 62933 is a system-level standard for full, grid-connected EESS. It is:
- Recommended, not mandatory under IET CoP
- Not required for separately certified components (battery + inverter)
- Accepted to be marked N/A on commissioning forms for EP + H1/H3 or ECS + H1/H3
FoxESS AIO systems (e.g. PowerQ, EVO) will align with IEC 62933 by design.
Battery Safety Standards: 62619 vs 63056
- IEC 62619 covers Li-ion safety, thermal runaway, BMS behaviour — and is used across MCS & global certs
- IEC 63056 is newer, for appliance batteries. Not yet widely adopted.
- Conclusion: FoxESS products certified to IEC 62619 are suitable for all domestic installs
Arc Flash Risk — Who Is Responsible?
| System Type | Arc Flash Assessment By |
|---|---|
| PowerQ, EVO (AIO) | FoxESS (Manufacturer) |
| EP/ECS + H1/H3 | Installer / Designer (on-site) |
FoxESS will issue an Arc Flash Design Statement for integrated systems confirming:
- Built-in fault protection (contactors, fuses, etc.)
- Shutdown logic via BMS and inverter
- Compliance with IET CoP Appendix E (Fig E.1)
PAS 63100 Commissioning Documents
The IET Code of Practice (Section 13, Pg 130) requires installers to complete the PAS 63100 commissioning forms.
These are now expected by NHBC and some DNOs for all domestic storage installs.
FoxESS will provide:
- Any technical documentation aligned with PAS 63100 checklist
