In compliance with NFPA 70, where should an existing fire alarm cable be spliced in a drop ceiling?

According to NFPA 70, which is the National Electrical Code (NEC), splicing of existing fire alarm cables must be done with particular attention to safety and accessibility. The requirement to splice cables inside a listed box or enclosure ensures that the connections are secure, protected from environmental factors, and compliant with electrical safety standards.

A listed box or enclosure provides an appropriate level of protection for the splices from physical damage and potential moisture, which could occur in environments like drop ceilings. Moreover, it allows for easier maintenance and troubleshooting in the future, as the enclosed connection remains accessible while being safeguarded.

This requirement helps prevent electrical faults that could lead to failures in the fire alarm system. It is vital in ensuring that fire alarm systems operate efficiently and reliably during an emergency, ultimately contributing to the safety of building occupants.