Your consumer unit (what used to be called a fuse box) is the central point that distributes electricity around your home and protects circuits from overload or fault. Older units use fuses; modern ones use circuit breakers and RCDs that react far faster to a problem.
A unit with old-style rewireable fuses, a metal (rather than fire-resistant plastic) casing, or no RCD protection at all are all signs it may not meet current safety standards, even if it still technically works.
Modern consumer units respond faster to faults, which meaningfully reduces the risk of electric shock and fire. If you're adding significant new electrical demand to a home — an EV charger, for example — an outdated unit may not be able to support it safely anyway.
A qualified electrician will assess your existing setup, replace the unit, and test every circuit to confirm everything is working and protected correctly — typically completed within a day for most homes.
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