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Hi, I have a mixer tap on my bath. The hot is tank-fed via 22mm pipe, the cold is mains fed via 15mm pipe. The problem is that the cold pressure is too high compared to the hot, which means that is is almost impossible to get a usable temperature when using the attached shower hose...

I wonder if this is what you are referring to...? I reckon it is There is a regulation that applies to ring circuits which are used to supply computer equipment (eg PCs). It is in place because PCs are notorious for having earth leakage, so this guarantees an effective earth. The...