I have a friend in CA that just had a litter drop last week. When she looked in at the mother she noticed her neck was in the air all distorted and several babies were in identical positions. When my friend reached in to look at the babies she received an electric shock. It turned out the birth fluid had seeped underneath the electrical tape at the heat tape connection. She lost six babies from electricution and would have lost the mother had she not caught the situation in time. I'm not sure what type of heat tape she used but no matter what I'd avoid having any possible exposed connections on the floor of the cage for this reason. A spilled water dish could have had the same result.
This is not an issue with me because I do not use any belly heat, only back heated rack systems with tubs that are isolated from direct contact with the heat source.

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