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Hi All, I'd appreciate your feedback and advice please : Customer has asked to relocate CU (and upgrade). I've done some basic tests and installation seems ok. It's TNS, today Ze 0.54, Ipf 0.55kA. FF has helped me and so I know it's got a BS1361 60A fuse. Existing 16mm tails about 3m long. New location may need 15m or more. Thinking 25mm 3core SWA. So, I will design check installation voltage drop and confirm increased 'Ze' doesn't knock out any final ccts. Should be fine. But protecting the new cable? Already today it would take about 0.5 sec for cutout fuse to discon I reckon. Many Thanks, David.