Final answer:
In addition to heat and mechanical shock, cylinders should be protected from electrical hazards, specifically thermal and shock hazards, by employing safety systems and devices.
Step-by-step explanation:
Cylinders, such as those used for storing gases at high pressures, need to be protected from several types of hazards. Alongside heat and mechanical shock, it is crucial to protect cylinders from potential electrical hazards as well. These electrical hazards can be broken down into two categories which are, thermal hazards and shock hazards. A thermal hazard occurs due to excessive electric power which could lead to overheating, possibly causing a fire or explosion if the gas within the cylinder is flammable. A shock hazard occurs when an electric current passes through a person, which can range from a painful shock to lethal electrocution. To mitigate these risks, electrical safety systems and devices are used, such as plastic insulation on wires to prevent both shock and thermal hazards.