The tanks are like these: http://www.mscivilengineers.com/images/12.jpg
I'm not sure what the bottom looks like, though. I'll have to go out and check them. So, you ran #6 all the way down the tank and bonded it inside of your enclosure/cabinet/whatever? On Mon, Sep 28, 2015 at 10:31 AM, Mark Radabaugh <[email protected]> wrote: > What type of tank? > > The hydropillar and waterspherioid style are generally well grounded. > > I have seen some of the steel tank on a concrete pedestal style where the > tank is not directly grounded to the pedestal but has a ‘spark gap’ between > the tank and the base. I’m not sure if the purpose was to distribute the > strike around the tank into the rebar in the column, or if it was an > attempt to isolate the steel for corrosion reasons. The tank we are on > like that consistently has the most lightning damage. I eventually ran a > #6 copper from the top of the tank to the railing and down inside to tie > everything together. It’s improved the situation considerably but it’s > still not perfect. > > Mark Radabaugh > Amplex > 27800 Lemoyne, Ste F > Millbury, OH 43447 > 419-837-5015 x1021 > [email protected] > > On Sep 28, 2015, at 10:19 AM, Adam Moffett <[email protected]> wrote: > > Yeah, I would think the tank itself is ground. > > On 9/28/2015 10:16 AM, Chuck McCown wrote: > > Common point grounding at the power ground would be the NEC answer. > > I would do that for power grounds and surge suppressor grounds because > most surges come via the power lines. > > For antenna mounting grounds etc, I would make sure they were in good > contact (bonded, perhaps with a separate bonding wire) to the tank or > railing or whatever metal structure you are attaching to. > > *From:* Josh Baird <[email protected]> > *Sent:* Monday, September 28, 2015 8:13 AM > *To:* [email protected] > *Subject:* [AFMUG] Grounding strategies for water tanks > > We are going to be installing on several water tanks that do not have any > other carriers on them. I'm assuming there is probably not a ground ring > or system in place at these sites. The electrical service is likely > grounded independently using a ground rod at the pole. > > These sites will have batteries and a charger at the bottom and fiber/DC > up the tower. Admittingly, I'm fairly (ok, very) stupid when it comes to > grounding systems. I understand that everything *should* be bonded > together. However, if the tank it's self doesn't have a sufficient > grounding system already in place, what is the best strategy here? > > Thanks, > > Josh > > > > > >
