So the cable insulation is burnt, the fuse carriers are burnt, the cover is burnt - and all these things are the same in the boxes which are not wooden backed.
But the wooden back which people get agitated about because its flammable and therefore unsafe is virtually unscathed.
Not just recommended, the green holders are keyed so they will only fit next to the main switch on a 100A board.
The wire emerging from it also looks a bit small for a 45A fuse.
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