Chain link fencing bonding
Chain link fencing bonding
(OP)
Can anyone tell me if there is a requirement in the 2008 NEC (because I can't find one) that requires a metal chain link fence to be grounded with an intentional ground rod, etc. under the following situation. There is an existing million+ gallon municipal water storage tank on a site. There are a few upgrades going on, including a new electrical service for security lighting and to replace some worn out components in the pump vault (in the ground near the tank). The project along includes a new chain link fence around the site to keep vandals out. The inspector says the fence needs to be bonded to the water tank. I cannot find the requirement. Anyone have any thoughts






RE: Chain link fencing bonding
Bonding the fence won't hurt anything except your costs, but probably won't help safety much either.
RE: Chain link fencing bonding
"Theory is when you know all and nothing works. Practice is when all works and nobody knows why. In this case we have put together theory and practice: nothing works... and nobody knows why! (Albert Einstein)
RE: Chain link fencing bonding
RE: Chain link fencing bonding
Not aware of an NEC requirement. It's required in substations.
But it might be less expensive to just do it rather than argue with the inspector. You may need a little good will for other arguments to come.
RE: Chain link fencing bonding
OT a little, but I found this {apparently new work} in an old 69:12kV station. Any suppositions for its application?
It's a bit hard to see in the shadow, but the center post jist clears the base rock.
RE: Chain link fencing bonding
Very useful picture.Is it from a SVC installation,where the fence has to be broken at several places to mitigate circulating ground currets generated by the magnetic reactors?
Dumbo2929,
I donot think you need to bond the fence to the tank due to,
1)The fence is 11 ft(3m away)from the tank. If there is a ground fault in the tank structure, then the most of the voltage drop through the soil is only effective within the first 2m span maximum.
RE: Chain link fencing bonding
I have my doubts that this style of isolation actually works. The two posts on either end are essentially connected together through the earth.
We use a 2.5 meter section of wood or plastic fence as an isolation. The length is selected to prevent someone from touching both grounded parts of the fence at the same time. Fence on either side of the isolation are connected/bonded to local ground grids or rods.
RE: Chain link fencing bonding
Kiribanda—
The station is fairly small [probably <7.5MVA...serving a ~60-year-old low-head hydro machine] and peering though the fence slats, doesn't look like it has any reactors or even capacitors.
RE: Chain link fencing bonding
Someone please correct me if I am wrong.