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bonding a short section of water supply pipe

wallywombat
In a victorian terrace house, a lead water supply pipe enters the damp cellar, runs about a meter along the wall to the main brass stopcock, then converts to plastic pipe before exiting the cellar to the rest of the house (which is likely to be a mixture of copper and plastic). The stopcock is a couple of feet away from the CU. Should the supply pipe be bonded? My feeling is no, but I'd be interested in other opinions.


While I'm on the subject, a more general question. Why must any bonding be done after the main stopcock? For example where the supply tees off immediately after the stopcock, is it better to bond one of the tees, or bond just before the stopcock? Where there is a long run of supply pipe before the stopcock, is it better to bond after, with a long MPBC run back to the MET, or bond it near the MET even where that's before the stopcock?
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    I recently got SSE to replace the service head on an old domestic PILC supply . The old earthing conductor was connected to the steel sheath and had a high Ze (about 1.5 ohm). They stripped back a couple of inches of the steel sheath, exposing the lead, then used a clamp which resembled two copper conduit saddles connected "foot to foot" to connect to the lead. I was surprised that there was apparently no constant-force spring arrangement, and was also left confused as to whether the lead or the steel is the preferred earthing arrangement. I would have asked the fitter some questions, but what with COVID and all,l I just left him to it.
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    I recently got SSE to replace the service head on an old domestic PILC supply . The old earthing conductor was connected to the steel sheath and had a high Ze (about 1.5 ohm). They stripped back a couple of inches of the steel sheath, exposing the lead, then used a clamp which resembled two copper conduit saddles connected "foot to foot" to connect to the lead. I was surprised that there was apparently no constant-force spring arrangement, and was also left confused as to whether the lead or the steel is the preferred earthing arrangement. I would have asked the fitter some questions, but what with COVID and all,l I just left him to it.
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