NEC quotes relevant to this discussion:
Not less than two driven ground rods placed at a minimum of 6 feet
apart when a non-metallic water piping system exists or is to be installed.
A separate grounding conductor to each ground rod shall be utilized
The grounding electrode conductor shall be solid or stranded , sized in
accordance with the requirements of the NEC but shall in no case be less
than No. 6 AWG copper or No. 4 AWG aluminum or copper-clad aluminum.
All ground rods will be required to be minimum 1/2" x 8' copper weld or
5/8” x 8’ copper plated only.
No galvanized rods or piping will be accepted as a grounding electrode.
73
Frank
W3LPL
----- Original Message -----
From: "Donald W. Kane via RFI" <rfi@contesting.com>
To: eedwards@oppd.com, rfi@contesting.com
Sent: Friday, January 16, 2015 1:23:03 AM
Subject: Re: [RFI] w7ekb & ground rods
NEC requires minimum 6 ft. between ground electrodes..for better
performance minimum 2X electrode length (e.g. 16 ft for 8 ft rods).
73
Don
WB2BEZ
In a message dated 1/15/2015 4:46:00 P.M. Eastern Standard Time,
eedwards@oppd.com writes:
Excellent point Jim. All services' grounds (AC, telephone, television,
internet and ham shack cable entry point & ham tower) must be bonded to a
single-point ground system. There's no limit on number of ground rods as long
as they're bonded (i.e. tied to the same grounding system). 8 foot ground
rods need to be within 16 ft of each other, but can be closer if needed to
shorten cable run to each service ground connection.
Couple more good references for grounding and bonding standards from
Motorola & Harris:
http://www.radioandtrunking.com/downloads/motorola/R56_2005_manual.pdf
http://www.repeater-builder.com/ge/lbi-library/t4618r3a.pdf
73, de ed -K0iL
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