1. Recommendations for Lightning Protection

(1) Outdoor Protection

Installation Suggestions

• Installed on the pole, the camera should not be at the very top. Slightly move it down, or it is easy for the camera attract lightning.

• It is better to have a lightning rod at the top of the pole.

• The camera housing should be grounded.

• In theory, it would be better to add a Junction Box, so the tail wire can better avoid lightning with a shell protection.

• If possible, deploying lightning arrester on site, especially in coastal areas where there are often thunderstorms.

Lightning Protection

Figure1 Correct Outdoor Installation

Lightning Protection

Figure2 Incorrect Installation

Lightning Protection

Figure3 3-in-1, 2-in-1 and PoE Lightning Arresters


• When you use PoE, the network port of the 2-in-1 lightning arrester does not work.

• Please check purchase advice of Lightning Arresters or consult Milesight support.

(2) Indoor Protection

Installation Suggestions

• For systems with unstable voltages, transient severe surges may cause damage to switches and cameras. Therefore, voltage regulators need to be deployed in the system.

• Pay more attention to surge intrusion through signal wires. It is better to add a signal surge arrester.

2. Troubleshooting Steps for Lightning Strikes

(1) Installation and Weather

Step1: Confirm the installation environment; (Whether the camera is installed in an open outdoor or on a pole? Whether lightning arrester is installed? Whether the camera housing is grounded);

Step2: Confirm if a thunderstorm occurred recently;

Step3: Share the information with Milesight Support.

(2) Power Supply Method

If the camera model supports both DC and PoE, try both of them to confirm which circuit is damaged.

Step1: If the camera can not power on with DC but can power on with PoE, there is a high possibility that the motherboard is damaged;

Step2: If the camera can not power on with PoE, but can power on with DC, and there is an IR-CUT sound with IR LED on, but the camera cannot be accessed when the camera starts up, the possibility is that the interface board is damaged;

Step3: Contact Milesight Technical Support for RMA.

(3) Disassembly and Inspection

Step1: Disassemble the camera to check if there are obvious burn marks on the motherboard and interface board;

Step2: If there are no obvious burn marks on the board, use a multimeter to measure whether the components on the board are short-circuited;

Step3: Share test results with Milesight Support.