I had access to a VM cabinet this week again for the first time in a couple of years. Electrical service supplying it had failed and VM van had been sat on site all day running it via an inverter before we installed our own generator to supply it. This cabinet had a small heater installed which no doubt was to help need the damp down and I suspect might attract snails if there is access for them to get in
tbh we get the same thing with our own old LV feeder pillars they have an old cast iron 60w heater to help reduce damp.