Final answer:
The question pertains to the general requirements for bonding and grounding electrical equipment within an electrical engineering context, specifically for safety to prevent electrical shock and thermal hazards. Proper grounding and bonding ensure a low-resistance path for faults and a zero-volt reference point for conductors.
Step-by-step explanation:
The subject of the question, '250.4 General Requirements for Bonding. (A) Grounded Systems. (3) Bonding of Electrical Equipment,' relates to electrical engineering, specifically regarding electrical safety systems and their installation of bonding and grounding in grounded systems. It is essential to have a clear understanding of what constitutes proper bonding and grounding to ensure safety and prevent hazards. The referenced section is discussing the measures taken to bond electrical equipment to protect against electric shock and thermal hazards, which is a critical aspect of the electrical code.
Bonding is a method used to create a low-resistance path back to the source of electricity, ensuring that in the event of a fault, such as a short circuit, the current can safely return to its source rather than passing through a person or causing a fire. Grounding involves connecting conductors to the earth using a good conductor, thus preventing the conductor from carrying a voltage which could lead to electrical shock or thermal dangers. Circuit breakers protect the system from thermal overload and provide a critical layer of protection in a three-wire system, which includes a live/hot wire, a neutral wire, and an earth/ground wire. Grounding the neutral wire and appliance casing ensures that these elements are at zero volts, providing an alternative return path for electric current through the earth.