Consider the schematic for a flash light.
Neutral wire bus bar.
However the white and bare wires both have the same ground.
The black hot wires are protected from overload by circuit breakers in the panel which typically sense the current in the hot wire and trip out if current is exceeded for too long.
The problem primarily comes from the inappropriately named neutral wire.
The original bar is mounted in a plastic housing which i assume isolates it from the box.
Your answer is yes you do put in the bare wire with the white wire.
The white wire is neutral not ground.
If that voltage is not the same it will trip gfci.
A double tapped neutral is when more than one neutral wire is fed into a single screw terminal on the neutral bus bar in the main electric panel.
There is nothing neutral about a neutral wire.
There is also a bare ground wire from the neutral bar to the water pipes.
You can see this clearly in the picture below as there are multiple neutral wires feeding into a single screw in more than one instance in this spaghetti mess of wires.
Neutral bus bar once the power leaves the electrical service panel through the hot wire s of a circuit and does its work through the electrical devices light bulbs outlets etc the electrical current returns back to the service panel through the neutral usually white circuit wire which is connected to the neutral bus bar.
Some gfci breakers have between 30 80volts on neutral.
It is a current carrying conductor just like a hot wire and has all the potential for danger and should be treated with the same respect.
They relate to safety and should be corrected.
And on spas if ground wire is loose or water filled equipment you can have that voltage in water.
Gfci s work differently and can put out a voltage on the neutral to be reconciled later on the ground bus.
When there is two neutral wires in one hole on the neutral bar of an electrical panel several things may happen.
The bare wire is a ground to.