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I am considering having the existing fuse box (which has the old wire type fuses) replaced by a consumer unit with an RCD. However, I note that the existing system has PME type earthing and it's therefore not clear to me the installing a RCD consumer unit will add much by way of safety...

The manufacturer says that I should fit a double pole isolator spur before the pullcord switch/light switch. This will be very difficult because of access. Can I instead insert a three pole isolator immediately before the transformer? Also, could I incorporate two RCD devices in the...