Circuit integrity (CI) cable can be spliced with off-the-shelf twist-on connectors between the controls and the zone it serves.

• A. True
• B. False
• C. Only with approved connectors
• D. Not allowed to splice

Answer: (B)

The important idea is that circuit integrity cables must be spliced only with connectors that are specifically listed and approved for CI cables, and typically within a listed enclosure. CI cables are designed to maintain circuit continuity under fire conditions, so the splicing method must preserve that rating. Off-the-shelf twist-on connectors are not rated or listed for CI cable splices and don’t provide the necessary fire resistance, sealing, or environmental durability. Because of that, the statement that CI cable can be spliced with ordinary twist-on connectors is not correct. If a splice is needed, use a connector and enclosure that are explicitly approved for CI cables according to the listing and code requirements.