They are moving a handicap chair lift and the new unit needs bonded. well sure!
NEC Section 680.26, paragraph 3
"All metal fittings within or attached to the pool structure shall be bonded. Isolated parts that are not over 100 mm (4 in.) in any dimension and do not penetrate into the pool structure more than 25 mm (1 in.) shall not require bonding."
now the old lift was not bonded, never bothered anyone for at least 12 yrs
there was no rebar near the location of the new lift, this will take a lot of chipping to find some building steel
first, pls help me understand:
I am trying to understand where the "sit-potential" lies:
:angel:if there is less earth resistance to flow [anchor bolted chair] than neutral or bonding grid resistance and
lets say a niche light has some leakage
then, in that chlorine water, the chair lift becomes the low impedance path for the stray current.
so we will do whatever it takes to get to an approved gec and bond
i would think a split bolt would grab the rebar to the #8 here just as well as a uffer.
Now, for the delicate part of the question:
I have a coworker who suggested we just drive a ground rod at the lift without connecting it to the pool grid.
He has shown in other instances he doesn't really know what is the most important wire in the panel and why.
What is the difference between the grounded and grounding conductors
He thinks a ground rod is equal to a center tap on the source xfmr, because, I guess, it has something to do with that it is "metal" and somehow "magically grounded"
He's a fine pipe bender and an all around nice guy. And I certainly have my limitations!
Showed me some interesting things like to use duct tape on wire pull instead of electrical tape. so obvious now... Never occurred to me.
So what is my question?
1. how to sell the chair job to superiors: we have to find rebar or go all the way to the panel =0 for the new chair lift when the old lift had no bond and was just fine.
2. how to work along side someone who has many nice qualities but is missing some basics and when I make suggestion he replies with "Well, the way I was taught..."
Here at the pool it was a frightening reminder of the idea that the isolated rod was an adequate substitute to the equipotential bonding grid.
btw:
heres a poll
what is the most important wire in the panel?
I made reference to it above
thanks!
NEC Section 680.26, paragraph 3
"All metal fittings within or attached to the pool structure shall be bonded. Isolated parts that are not over 100 mm (4 in.) in any dimension and do not penetrate into the pool structure more than 25 mm (1 in.) shall not require bonding."
now the old lift was not bonded, never bothered anyone for at least 12 yrs
there was no rebar near the location of the new lift, this will take a lot of chipping to find some building steel
first, pls help me understand:
I am trying to understand where the "sit-potential" lies:
:angel:if there is less earth resistance to flow [anchor bolted chair] than neutral or bonding grid resistance and
lets say a niche light has some leakage
then, in that chlorine water, the chair lift becomes the low impedance path for the stray current.
so we will do whatever it takes to get to an approved gec and bond
i would think a split bolt would grab the rebar to the #8 here just as well as a uffer.
Now, for the delicate part of the question:
I have a coworker who suggested we just drive a ground rod at the lift without connecting it to the pool grid.
He has shown in other instances he doesn't really know what is the most important wire in the panel and why.
What is the difference between the grounded and grounding conductors
He thinks a ground rod is equal to a center tap on the source xfmr, because, I guess, it has something to do with that it is "metal" and somehow "magically grounded"
He's a fine pipe bender and an all around nice guy. And I certainly have my limitations!
Showed me some interesting things like to use duct tape on wire pull instead of electrical tape. so obvious now... Never occurred to me.
So what is my question?
1. how to sell the chair job to superiors: we have to find rebar or go all the way to the panel =0 for the new chair lift when the old lift had no bond and was just fine.
2. how to work along side someone who has many nice qualities but is missing some basics and when I make suggestion he replies with "Well, the way I was taught..."
Here at the pool it was a frightening reminder of the idea that the isolated rod was an adequate substitute to the equipotential bonding grid.
btw:
heres a poll
what is the most important wire in the panel?
I made reference to it above
thanks!