Which statement is true about clamps used to support lines?

Which statement is true about clamps used to support lines?

• A. Bonded clamps are used for support when installing wiring
• B. Unbonded clamps are used for support when installing metal tubing
• C. Both No. 1 and No. 2 are true
• D. Neither statement is true

Answer: (C)

The main idea is that there are two types of clamps for supporting lines: bonded and unbonded, and each is used in a different grounding situation. Bonded clamps are designed to provide or maintain electrical continuity as part of the grounding path. When you’re installing wiring, you want the metal raceway or armor to stay bonded to the grounding system so fault current can return safely, and a bonded clamp helps ensure that continuity at the support points. Unbonded clamps, on the other hand, are used in situations like supporting metal tubing (conduit) where the conduit system itself will form or already provides the bonding path, or where you don’t want the clamp to participate in grounding. In those setups, the clamp does not need to carry the grounding connection. So both statements are true: bonded clamps are used for wiring installations to maintain grounding continuity, and unbonded clamps are used for supporting metal tubing where bonding is handled by the conduit system or elsewhere.

The main idea is that there are two types of clamps for supporting lines: bonded and unbonded, and each is used in a different grounding situation. Bonded clamps are designed to provide or maintain electrical continuity as part of the grounding path. When you’re installing wiring, you want the metal raceway or armor to stay bonded to the grounding system so fault current can return safely, and a bonded clamp helps ensure that continuity at the support points.

Unbonded clamps, on the other hand, are used in situations like supporting metal tubing (conduit) where the conduit system itself will form or already provides the bonding path, or where you don’t want the clamp to participate in grounding. In those setups, the clamp does not need to carry the grounding connection.

So both statements are true: bonded clamps are used for wiring installations to maintain grounding continuity, and unbonded clamps are used for supporting metal tubing where bonding is handled by the conduit system or elsewhere.