They break down proteins to generate energy, and do not produce much heat. They also produce some very smelly byproducts that can make a compost pile stink like rotten eggs or sour milk. These smells often attract scavengers. Compost that contains meat can attract mice, skunks, buzzards, and even bears.
The power conditioner provides protection against surges in power just as a surge protector does, but a power conditioner also maintains a continuous voltage fed to the computer during temporary voltage reductions, such as a brownout.
Class 1, 2 and 3 circuits are defined primarily in terms of the power supply to which they are connected. Power supplies are generally batteries, transformers or electronic power supplies. When working on an existing installation, it is a simple matter of identifying the power source and checking its marking.