This "gutter service" is to be built on the exterior back wall of a free-standing building. Three fused safety switches, one main breaker panelboard, and one main lug only panelboard are installed above the gutter.Refer to the 800-amp 120/208-volt 3-ph, 4-wire installation shown in Figure 304.21. 750 kcmil conductors are installed from the utility transformer to the gutter. Panel
A is a 225-amp MB panelboard and the conductors will be tapped in the gutter. This installation is outside and you will install a myers hub in the top of the gutter with a RMC nipple into the bottom of the panel through eccentric KOs. You will need to install a bonding bushing on this nipple. The smallest BJ you can connect between the bonding bushing and the ground bar in the panel is ___ AWG.
Select one:
a.4
b.2
c.2/0
d.1/0
e.3
