Regulations & Safety
Is My Old Fuse Box Illegal?
An old fuse box is not illegal in itself — but it may be unsafe and can fail an EICR. Here is how to tell.
By Steels Electrical · 4 June 2026 · 4 min read
The short answer
No — an old fuse box is not automatically illegal. There is no law forcing you to replace a working board. However, an old board with rewireable fuses or no RCD protection may not meet the current wiring regulations, and an EICR can code it as potentially dangerous (C2) and therefore unsatisfactory. For landlords, an unsatisfactory EICR must be put right; for homeowners it is a safety recommendation.
People often hear that their old fuse box is “illegal” and panic. The reality is more nuanced: it is about safety and compliance with current standards, not legality in the criminal sense.
The difference between illegal and unsafe
There is no law that bans old consumer units outright. But the wiring regulations (BS 7671) set the current standard, and an inspector judges your installation against it. An old board with no RCD protection or with cracked, scorched parts can be coded as potentially dangerous on an EICR — which makes the report unsatisfactory and, for a landlord, legally requires action.
Signs your board should be replaced
Consider an upgrade if you have:
- Old rewireable (“fuse wire”) or cartridge fuses instead of breakers.
- No RCD — no test button anywhere on the board.
- A cast-iron or wooden-backed board (very old).
- Cracks, scorching, or a burning smell.
Frequently asked questions
- Will an old fuse box fail an EICR?
- It can. The lack of RCD protection is commonly coded C3 (improvement recommended) or C2 (potentially dangerous) depending on the circuits involved. C2 makes the report unsatisfactory.
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