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Message: <blockquote data-quote="Sideways" data-source="post: 1575848" data-attributes="member: 27953"><p>Changing the insulation potentially invalidates the original design and creates a fire hazard.</p><p>We can't teach you electrical design calcs here.</p><p>The smart move would be to get it checked for peace of mind. Mention installation method 103 and derating for 40C ambient.</p><p>It may well be fine and even if not, if you plan to use LED lights, replacing the breaker in the consumer unit with a lower rating device is cheaper than changing the wiring.</p><p>What matters here is that the circuit breaker in your fusebox will allow a certain level of overload current through for days without tripping. The wiring, subject to the installation method, ambient temp, bundling with other wires, etc must be able to carry that overload without getting hotter than the 70C temperature its insulation is rated to.</p><p></p><p>As above, the real concern isn't so much lights as any high power / long duration circuits that might run through your loft. Showers and immersion heater cables are candidates.</p></blockquote><p></p>

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