poolsparky
Member
1. the average concrete pool in florida is an incredibly low resistance Ufer ground.
2. 99 percent of my power runs have a #10 stranded thwn ground and go from the main panel at the meter to a subpanel at the pool equipment.
3. the average house ground at the meter is garbage.
so, any crap that winds up at the meter, (like lightning surges, of which we have plenty) is heading straight for the pool. what's that gonna do to my #10?
Explanations of 1, 2 and 3:
1. a pool shell has upwards of two thousand feet of rebar, encased in concrete, in contact with soil. the deep end is often at the level of ground water. at least two (usually three) #8 wires are bonded to the rebar. these #8s land on various pool equipment which have #12 green in their power feeds. so, there's a pretty solid connection between all that rebar and the ground bar in the pool panel. anybody have a megger? i'm taking bets at less than one ohm.
2. i've been doing exclusively pools and spas for five years and i NEVER FLUNK! (anymore)
3. average home in orlando is two 8' ground rods in dry sugar sand not deep enough to touch ground water. ground water level is visible at the bottom of the hole they dug for the pool. my bet is over 500 ohms.
2. 99 percent of my power runs have a #10 stranded thwn ground and go from the main panel at the meter to a subpanel at the pool equipment.
3. the average house ground at the meter is garbage.
so, any crap that winds up at the meter, (like lightning surges, of which we have plenty) is heading straight for the pool. what's that gonna do to my #10?
Explanations of 1, 2 and 3:
1. a pool shell has upwards of two thousand feet of rebar, encased in concrete, in contact with soil. the deep end is often at the level of ground water. at least two (usually three) #8 wires are bonded to the rebar. these #8s land on various pool equipment which have #12 green in their power feeds. so, there's a pretty solid connection between all that rebar and the ground bar in the pool panel. anybody have a megger? i'm taking bets at less than one ohm.
2. i've been doing exclusively pools and spas for five years and i NEVER FLUNK! (anymore)
3. average home in orlando is two 8' ground rods in dry sugar sand not deep enough to touch ground water. ground water level is visible at the bottom of the hole they dug for the pool. my bet is over 500 ohms.