It’s the job of the installer to consider the location of the security equipment and associated wiring methods when selecting the right splicing devices, equipment and wiring type. If cables are to be installed and spliced in a wet location, then the splicing device should be listed for use in wet locations.

Likewise, if there will be an extremely long run of cabling between security equipment and devices, consideration should be given to factor in voltage drop since proper voltage and signal levels are critical for proper system operation.

Below is a sample of NFPA 731. For the complete section, see the actual NFPA 731 text at NFPA.ORG. Once there, click on the free access link to the latest edition of NFPA 731.

7.7 Physical Conductors.

7.7.1 All cabling and wiring used for the connection of video surveillance equipment shall be installed in accordance with the requirements of 4.6.3.

7.7.2 Cable Jacket Specifications. All cables shall have jackets appropriate for the installed environment.

7.7.3 Compatibility. All interconnecting cable shall be compatible with the video surveillance system equipment and be installed according to the equipment manufacturer’s instructions and 4.6.3.

7.7.4 Connections.

7.7.4.1 The installer of the video surveillance system shall possess and understand the tools necessary to ensure that cable preparation and connections are installed in a workmanlike manner.

7.7.4.2 Twist-on connectors shall not be used.

7.7.5 Applications of Conductors and Wiring.

7.7.5.1 Control Wiring. All control wiring shall be sized to deliver the manufacturer's optimum operating voltage from the power supply or controller to the device being driven.

7.7.5.2 Power Cabling. The minimum size of power conductors shall be in accordance with NFPA 70.

7.7.5.3 Video Signal Transmission Wiring. Wiring used for video signal transmission shall not exceed the distance limitations in the video equipment manufacturer’s instructions.