Ed Holt
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Everything posted by Ed Holt
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I don't have my codebook handy, but the picture refers to TABLE 110.20, not article 110.20.
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This will probably get to you too late to be of benefit, but I hope not. If I understand you correctly, the main grouding electrode conductor (gec) has been disconnected due to the installation of plastic plumbing. If there is still metallic water piping in the house, 5' or more in length, then there must be a gec run to it from the panel. The neutral conductor can be connected to the ground conductor at only one location at the building. What your picture shows is actualy redundant; the power company has done this at their transformer. This "ground" wire is now a parallel neutral conductor and as such is undersized and dangerous.
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These were commonly referred to as "main, range, and four" panels. As the term implies, they provided for a main disconnect, a range disconnect, and four branch fuses. Seeing four fuses sized at 30 amps would require fusestat adaptors to be installed, sized accoording to the wire sizes for each fuse. This is because we know that the house was not wired with 10 awg wire. The National Electrical Code requires adaptors be installed in a case like this because oversize fuses could no longer be installed.