Single cores outside enclosure

Eh? Where is the fire coming from?

I can play this game too, Graham.

There is an assumption in the regulations that electrical fires can only come from electrical overheating, in the same way, that electric shocks can only come from direct contact with some things at different potentials. This may be a live point and real earth, or both a live and neutral conductor) ignoring 3 phases for the moment. Insulated but not sheathed conductors are not unsafe to touch, they are only dangerous if also damaged, maybe in the touching or a previous incident.

It, therefore, follows that insulated conductors that are not damaged are only dangerous if they can be damaged, so those hidden from contact by position cannot be dangerous. It is also implicit that containment (cable sheath, plastic conduit, accessory boxes) does not need to be conductive to provide mechanical protection where contact is likely.

Electrical fires can only occur if there is serious overheating, and there is inflammable material present and close enough to burn. Overheating is almost always due to poor resistive connections, or faulty appliances such as a toaster that fails to “pop-up”. A cooker fire from the chip pan is not an electrical fire. We protect cables etc. from serious overheating with the CPD, and the design. Whether an AFD can protect against poor connections is far from clear, so this must be the primary cause.

Unsheathed cables themselves are not really “potentially dangerous” but could become so if there is a mechanical incident, but the same could just as well happen if a plastic accessory is smashed. We do not code plastic accessories as C2, and therefore the exposed cables should receive the same treatment and require improvement, C3.

There is a serious logical inconsistency in many of these codings from the books, they do not reflect the danger correctly, and many are a case of “I don't like the look of that”. The fact that a situation does not exactly reflect the regulations does not mean that it must be dangerous, even if a potential danger can be found by imagining some very unlikely scenario. In that way all of life is dangerous, even being in bed. Most people die in bed, does that mean beds are inherently dangerous and should be banned? It certainly means that all kinds of transport should be banned, particularly horses, riding is one of the most dangerous kinds of transport.

Eh? Where is the fire coming from?

I can play this game too, Graham.

There is an assumption in the regulations that electrical fires can only come from electrical overheating, in the same way, that electric shocks can only come from direct contact with some things at different potentials. This may be a live point and real earth, or both a live and neutral conductor) ignoring 3 phases for the moment. Insulated but not sheathed conductors are not unsafe to touch, they are only dangerous if also damaged, maybe in the touching or a previous incident.

It, therefore, follows that insulated conductors that are not damaged are only dangerous if they can be damaged, so those hidden from contact by position cannot be dangerous. It is also implicit that containment (cable sheath, plastic conduit, accessory boxes) does not need to be conductive to provide mechanical protection where contact is likely.

Electrical fires can only occur if there is serious overheating, and there is inflammable material present and close enough to burn. Overheating is almost always due to poor resistive connections, or faulty appliances such as a toaster that fails to “pop-up”. A cooker fire from the chip pan is not an electrical fire. We protect cables etc. from serious overheating with the CPD, and the design. Whether an AFD can protect against poor connections is far from clear, so this must be the primary cause.

Unsheathed cables themselves are not really “potentially dangerous” but could become so if there is a mechanical incident, but the same could just as well happen if a plastic accessory is smashed. We do not code plastic accessories as C2, and therefore the exposed cables should receive the same treatment and require improvement, C3.

There is a serious logical inconsistency in many of these codings from the books, they do not reflect the danger correctly, and many are a case of “I don't like the look of that”. The fact that a situation does not exactly reflect the regulations does not mean that it must be dangerous, even if a potential danger can be found by imagining some very unlikely scenario. In that way all of life is dangerous, even being in bed. Most people die in bed, does that mean beds are inherently dangerous and should be banned? It certainly means that all kinds of transport should be banned, particularly horses, riding is one of the most dangerous kinds of transport.