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I had my meter changed last week and watched the Honeywell tech. I had already shut down and disconnected sensitive devices like computers. I had also shut the A/C units off. He agreed it was a good idea. But takes 5 minutes of his time. When he tried to install the new meter into the old contacts he had some problems. He tried 3 times. Each time the electric made momentary contact. But I can just imagine what my refrigerator and freezer were doing when the current was so intermittent for a few seconds, 3 times. Before he left I checked my house and found that some devices (phone and clock) reacted to that rapid ON/OFF power. My whole house surge had no reaction. But I did not have any damage to my devices.
So I would highly recommend you MAKE AN APPOINTMENT WITH HONEYWELL AND POWER DOWN AND UNPLUG SENSITIVE DEVICES LIKE COMPUTERS, A/C, AND ANYTHING WITH A COMPRESSOR LIKE FRIG. AND FREEZER. PUT A NOTE ON YOUR DOOR: "HONEYWELL: NO METER CHANGE WITHOUT MY PRESENCE."

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