How to check lightning arrester

Lightning strikes pose a significant threat to homes and buildings, necessitating protection measures. A lightning arrester is a device that diverts lightning strikes away from structures and prevents damage. To ensure your lightning arrester is functioning correctly and adequately protecting your property, follow these steps:

  1. Inspect visually for signs of damage or visual indicators of a lightning strike. If you notice any damage, have a professional electrician inspect and repair the device immediately.
  2. Test the resistance of the arrester using a multimeter. The resistance should be within the manufacturer’s specifications, usually between 50 and 500 ohms. If the resistance is outside the specified range, replace the arrester.

  3. Verify that your lightning arrester is installed correctly on your roof or high-voltage structure, at least six feet above the ground, and within 15 feet of a grounding rod. If you’re unsure about installation, have a professional electrician inspect and adjust as needed.

It’s recommended to inspect your lightning arrester every five years by a professional electrician, but this may vary depending on your location and property type. Do not install your own lightning arrester without proper training and knowledge of electrical safety protocols. The cost of a lightning arrester varies depending on the size and type of structure you need protection for, with residential lightning arresters typically costing between $500 and $2,000, while commercial-grade devices can be significantly more expensive.

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