Bonding joins separate metal parts so they behave electrically as one piece, with no difference of potential between them.
A bonding jumper that looks installed and is not actually making contact is worse than an obviously missing one -- everything appears right and the path is not there.
A braided jumper between two pieces of metal is only doing its job if the metal-to-metal contact is real at both ends. Torque matters. Material compatibility matters. Corrosion matters. And what is between the contact surfaces matters: paint sitting under a bonding connection can be the difference between continuity and the appearance of continuity.
Check yourself: A bonding jumper is bolted to a painted enclosure and looks correct. Is the path established?
Answer: Not necessarily. Paint between contact surfaces can matter, so the connection has to be made according to the approved connection instructions.
Bonding depends on actual metal-to-metal contact. A coating between the surfaces sits in the path, and a jumper that is mechanically tight can still be electrically poor.
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Written from the owner's poster for this lesson. Nothing added beyond what the poster states.
Written for Texas apprentices as free study material. The Texas apprentice licence is an application, not an exam (Occupations Code 1305.161), and nothing here counts as apprenticeship hours or continuing-education credit. VoltMark is not affiliated with, endorsed by, or sponsored by NFPA, PSI, TDLR, or any state or local licensing authority. Always follow your employer's safety programme and your supervising electrician.
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