Peter, not being funny but where have you got this stupid idea about a fire being contained within an enclosure? Its yet another example of misinformation being posted on a forum. The wires entering the enclosure will burn won't they? How is a stupid little enclosure on the end of a cable going to stop fire spreading along the cable? The enclosure is there to protect the joint, prevent touching live parts and/or for covering basic insulation. NOT to contain a fire!