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Old 01-04-2012, 08:35 AM   #31
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Al grounds must be bonded together or you will have problems.
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Old 01-05-2012, 12:21 AM   #32
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Quote:
Originally Posted by cino72 View Post
Ok just so I am clear. 2 things im going to do first look and confirm i have a ground going to the water line then I am going to move the catv ground from the earth ground to water line.
Water pipe was once acceptable for earthing. Is no longer sufficient. If changed, an earth ground must be installed that is anything but the water pipe. Yes, a water pipe must remain bonded for human safety. But the CATV wire and all other incoming utilities must be earthed low impedance (ie 'less than 10 feet') to some other approved electrode such as ten foot ground rods.


Cable company was correct about 'no ground; no service'. You are responsible for providing a good earth ground. To meet code (only for human safety) and to eliminate other problems means single point earth ground.

A utility demonstrates good, bad, and ugly (prefered, wrong, and right) solutions. An (ugly) kludge solution interconnects all earthing electrodes with a buried wire:
http://www.duke-energy.com/indiana-business/products/power-quality/tech-tip-08.asp

The breaker box connects to earth via a quarter inch (6 AWG) bare copper wire. If that wire is not connected to that bus bar ground (as pictured), then sufficient earthing does not exist for 'human' safety.

Next install one 'whole house' protector (in the breaker box) so that best protection for that computer exists. Meanwhile, everything else at risk (furnace, digital clocks, dishwasher, etc) also have best possible protection. Only earthing (not a safety ground) makes a protector effective. IOW the 6 AWG wire must be short (ie 'less than 10 feet'), no sharp wire bends, not inside metallic conduit, and separated from other non-grounding wires. None are required to meet code (for human safety). But all are critical to 'earth' a protector - for 'transistor' safety.

Those same requirements also say why wall receptacle safety (equipment) ground is not earth ground. A protector must connect low impedance (ie no sharp wire bends, no splices) to earth. Best protector for that computer (and for the dishwasher, furnace, TV, clocks, etc) is that one 'whole house' protector ... but only if properly earthed. Best protection means better earthing at the breaker box. And no wire changes anywhere inside the house. No ground wire to any receptacle.

Your original question was about a safety ground. Safety grounds are for human safety. Either rewire the house or power the receptacle through a GFCI. That only for human safety.

Best protection for CATV is a short wire to single point earth ground. Many reasons why the cable company required earthing. It even eliminates ground loops. A protector is used only when an incoming wire cannot be connected directly to earth. Cable TV connects directly (as short as possible) to the single point earth ground - no protector required to have best protection. Described are safety and earth grounding for human safety (defined by code). And enhanced earthing (exceeds code) for transistor safety.

Last edited by westom; 01-05-2012 at 12:27 AM.
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Old 01-05-2012, 12:45 AM   #33
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Ok just so I am clear.
Your pictures show two 6 AWG ground wires to a left side bus bar. Follow both wires. One must connect where cold water enters the building. Other must route to earth ground without sharp bends, not inside metallic conduit, as short as possible, etc to both meet and exceed code requirements. You need not spend money routing three wire cables (safety ground) to receptacles. Trace and if necessary, upgrade earth ground and its wire connection. Connection to earth must also be low impedance (ie 'less than 10 feet') . That would be easy and inexpensive.
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Old 01-12-2012, 02:16 AM   #34
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Install two grounding rods more than six feet apart and run a continuous loop of #4 copper grounding wire from your panels ground neutral bus to both of the rods using acorn clamps. Then back to the panel. Then you can do your outlets if you feel comfortable. Stop and call an electricial if you don't feel comfortable doing this.
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