Maybe your neighbor's main panel lost their neutral connection back to utility.
Sec. 760.49 NPLFA circuit conductors
(A) size and use. Only copper conductors shall be permitted to be use for fire alarm systems. size 18 and 16 AWG conductors shall be...
I believe 680.26(B)(1)
Conductive pool shell
a. Structure reinforcement steel
b. Copper conductor grid: This means besides the pool structure steel shell, if you want to use...