The bonding jumpers must be no smaller then 8 AWG.
An EGC is only required to be minimum size required by 250.122.
An EGC must be green, green with yellow stripes, or bare (except bare isn't allowed here but is in most general applications).
A bonding jumper doesn't have any color identification requirements.
Bonding jumpers don't have to run back to the EGC bar. They are for bonding all the metal equipment around the pool, they will be bonded to the EGC at some point though unless you have no equipment that needs both EGC and bonding jumper - but that often means you don't even have any pumps.
That’s true for the equal potential bonding,.
Isn’t he talking about the (bonding) jumper in the conduit between the grounding terminals in the pool deck box and the nitch.
Article 680. throughout requires a min of a #12 equipment ground for all electric equipment including under water light niches except for low voltage not requiring equipment ground.
The insulated # 8 AWG in conduit is called a bonding jumper, but the section clearly says it for lighting fixtures requiring grounding.
Equipment grounding in article 680 min of # 12 and not smaller than 250.122
(B) Wet-Niche Luminaires.
. All forming shells used with nonmetallic conduit systems, other than those that are part of a listed low-voltage lighting system
• not requiring grounding,
shall include provisions for terminating an 8 AWG copper conductor.
(b) Nonmetallic Conduit. Where a nonmetallic conduit is used, an 8 AWG insulated solid or stranded copper bonding jumper shall be installed in this conduit
• unless a listed low-voltage lighting system not requiring grounding is used.