Bond
Bond turns up in 2 fields: corrosion, electricians. Here is what it means to the people in each one.
Bond in corrosion
Wire or cable connection that ties two metal structures together electrically, often to control CP current.
An intentional electrical connection between structures. Continuity bonds join pipe sections across mechanical couplings so the line carries current end to end; interference bonds connect a foreign line to a CP system so stray current has a metallic path home, usually through a resistor that sets the flow. Bonds are made in test stations or bond boxes and are checked for current direction and size on every survey.
"Put a resistance bond in at the crossing, the foreign line is dumping current onto ours."
Bond in electricians
Connection that ties metal parts together so they stay at one potential and give fault current a path home.
A bond is a permanent electrical connection between metal parts: a bonding jumper around concentric knockouts, a bonding bushing on a service conduit, or a conductor from the panel to the water and gas piping. Bonding gives fault current a low-impedance path back to the source so the breaker trips, and keeps anyone from touching two metal objects at different voltages. The main bonding jumper at the service and the system bonding jumper at a transformer are the only places neutral and ground are tied together.
"Put a bonding bushing on that service conduit and jumper it to the ground bar, the concentric KOs don't count."