![]() ![]() For the complete section, see the actual NFPA 731 text at NFPA.ORG. ![]() The splicing devices used must comply with NFPA 731 Section 4.6.3.3 which requires security system conductors to “ be spliced or joined with a mechanical splicing device listed for this purpose”.īelow is a sample of NFPA 731. If Class 2 or 3 circuits are used in security system wiring, no junction box is required but the splice cannot simply be twisting the conductors together and covering them with electrical tape. If Class 1 circuits are used in the security system and splices are made, the splices must be enclosed in a box or other acceptable enclosure. Nothing is mentioned in Article 725 regarding compliance with NEC ® 300.15 for Class 2 or 3 circuits other than Section 725.3(K) which requires a bushing to protect cables as they emerge from a raceway in compliance with 300.15(J). That being said, the portion of NEC ® Section 300.15 that requires splices to be in a box only applies to Class 1 circuits as mentioned in 725.46. NEC 725.3 states that “ only those sections of Article 300 referenced in this article shall apply to Class 1, Class 2, and Class 3 circuits”. The general rules on enclosing conductor splices in a box or other enclosure come from Part 1 of NEC ® Article 300, Section 300.15. Class 2 and 3 circuits are much more common in security system wiring. Rarely are Class 1 circuits used in security system installations. Many circuits in a security system are “signal circuits” and NEC ® Article 725 must be followed.Ī common question is whether a box is needed to enclose splices in Class 1, 2 or 3 remote- control, signaling, and power-limited circuits. NFPA 731 Section 4.6.3.1 requires the installation of all wiring, cable, and equipment to be performed in accordance with NFPA 70 (NEC), Article 725 or Article 800, where applicable.
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