Excuse me, could you please elaborate on the rules surrounding voltage? Are there specific standards or regulations that need to be adhered to? How does one ensure that the voltage levels in a system are within the appropriate range? Is there a potential for harm if these rules are not followed? Could you also explain any consequences that may arise from non-compliance with voltage regulations? I'm eager to understand the importance of these rules and how they contribute to the overall safety and functionality of electrical systems.