Billy_Bob
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If they're not connected to the electrical system, or bonded to anything that is... why would they need to be grounded?...
...How come you need to bond anything on a water supply, and you guys are arguing about shower valves & suchlike... doesn't the water in the pipes, already bond the whole system?...
Water does not conduct electricity...
http://www.google.com/#hl=en&q=wate...Water+conduct+electricity&fp=eec9c32d20fe6232
Then pipes go everywhere and a hot electric wire touching any pipe will energize the whole works. Say a homeowner pulls an extension cord through an attic and the wire gets stuck on a sharp object. Then the homeowner pulls harder, the wire strips, then comes free, but then the wire comes to rest on a water pipe. All the water pipes could become energized. Grandma goes to brush her teeth in the morning, turns on the water, and is electrocuted!
Here are actual cases...
Plumber was electrocuted while installing a section of water pipe...
http://www.safetysolutions.net.au/articles/32395-Safety-alert-on-water-pipes
Many a plumber has died by cutting through old galvanized pipes...
http://www.electronics-tutorials.com/basics/earth-dangers.htm
"a soldier received a strong electric shock when his clothed arm brushed a water pipe"...
(See Acrobat Reader page 13 - Document page 3)
http://www.dodig.mil/inspections/IE/Reports/Electrocution report Part I Final (7-24-09)_full.pdf
Review of Electrocution Deaths in Iraq: Part II...
http://www.dodig.mil/inspections/IPO/reports/ROI-Part II Final (24 Jul 09)_web.pdf