Dont know how long its been required, but my parents AG pool that was installed about 23 years ago had to have one. My IG pool also has one.
Also I dont think it has anything to do with how far the equipment is from the pool....its there to send any electrical hits to the water to the pump and, I believe, to cause the circuit breaker to pop after the extra electricity has been brought back to the pump.
Are you *sure* you dont have one? I believe it gets connected directly to the sides of the pool, and then the loop is created back to the pump. Maybe the wire is just buried somewhere around your equipment pad? It should be a fairly thick copper wire with a green outer shield, and there should be some sort of square attachment hanging off of the pump where this wire should be clamped into.
-Chris
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