[TowerTalk] Grounding Rod Lenght

[Jim Lux]

Steve's right.. "...exothermic welding, listed lug, listed pressure 
connector, or by listed clamp."


Must be bonded to any of:
- Building or structure grounding electrode system (that would be the UFER 
ground, for instance)
- Interior metal water pipe meeting certain requirements.
- Metal service raceway  (raceway is Code speak for conduit)
- Service equipment enclosure
- Building or structure grounding electrode conductor
- Metal enclosure enclsing the buidling or structure grounding conductor
- Accessible bonding beams such as 6" of AWG6 copper conductor connected to 
the service equipment or raceway.

That's not just any old conduit or junction box.. that's the service 
raceway or enclosure (i.e. the conduit coming up to the meter box or the 
box holding your main disconnect)

Separate ground rods provided for telecom or radio must be bonded to one of 
the above via a AWG6 or larger bare or insulated copper wire.

Then there's the peculiar requirements for telecom, etc.
Metallic sheath of telephone cable and primary protectors - close as 
practicable to point of entrance, and AWG14 or larger to acceptable earth 
ground (as above) in straight line runs (as practicable) (same basic rules 
for cable TV)

Antennas
metal structure (this includes the bracket holding the dish)
AWG 10 to acceptable earth ground.
lead in cable (i.e. coax or twinlead) - listed antenna discharge unit 
(grounding block) at entrance point, not near combustible material ... 
awg10 to the acceptable earth ground (AWG 8 aluminum can work.. I've seen 
aluminum wire in most dish installation kits.. it's cheaper)






At 12:08 PM 2/17/2004 -0500, K7LXC at aol.com wrote:
>In a message dated 2/17/04 5:53:55 AM Pacific Standard Time,
>jimlux at earthlink.net writes:
>
> > Clamping lightning grounds is a no-no... exothermic bonding (welding with
> >  thermite (as covered in detail over the past few weeks on this list) 
> is the
> >  preferred way)
>
>     Umm, I'm pretty sure that exothermic AND mechanical compression bonds 
> are
>both okay per the NEC.
>
>Cheers,
>Steve     K7LXC
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