Harold,
There aren't many Concrete pools being installed on Long Island from what I've seen. Many in-grounds here have metal frames bolted together, but continuity can easily be broken with non-conductive joiners or inserted parts (like steps). So that is why we generally do 2 points (diagonally) to the frame.
With above ground pools if you look at 680.26(C)(2) it says that the bonding grid shall be permitted to be the wall of a bolted or welded metal pool. From what I've seen many above ground pools do not have all of their structure bolted together. Some pieces may be screwed together (NG per 680.26(D) and 250.8) or just slip-fitted together. This would mean that they should be be connected directly to the solid copper conductor (via suitable connectors/methods).
I see a sticky situation here though. If this is the correct interpretation of the NEC and the contruction of the pool does not use Bolts it may be near impossible to bond every piece required. But certainly Multiple points would be better than 1. (IMO)
Are above ground pools UL Listed?
Bill
[This message has been edited by Bill Addiss (edited 09-06-2002).]
