An equipment bonding jumper can be installed on the outside of a raceway, providing the length of the equipment bonding jumper is not more than _____ in. and the equipment bonding jumper is routed with the raceway.

• A. 72
• B. 36
• C. 60
• D. 84

Answer: (A)

An equipment bonding jumper provides a low-impedance path for fault current, helping ensure the metal parts stay at the same potential and that the overcurrent device trips quickly. When this jumper is installed on the outside of a raceway but runs along with the raceway, the external portion must be limited in length to keep the fault-path impedance low and to reduce exposure to physical damage. The maximum allowed length for that external jumper is 72 inches; shorter lengths are also compliant, but 72 inches is the limit the code sets. If the jumper isn’t routed with the raceway or is placed inside a raceway, different rules apply.