Bonding sliding glass door tracks

One door track has a bonding/ground wire - the second door does not.

Any ideas? Can’t say that I have not seen a bonding wire in this type of application, but it is unusual. And why would one track/frame be bonded while a second one is not?


It the bonded frame less than 5 feet from the pool and the other more than 5 feet away?

Read #7 I believe your answer is there.