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The MTCDTIP Lightening Arrestor is designed exclusively to protect the IP67 range of the Multitech Gateways. Given the possible harsh environments at height, and the risk of lightening, this Lightening Arrestor can be earthed or grounded to protect the unit from strikes. Sitting between the LoRa Aerial and the Gateway, it provides additional protection and is highly recommended.
This is in addition to the ground options on the Gateway itself. Always follow the instructions, and always ground the gateway’s before power is applied.