Final answer:
The NEC provides requirements for safe electrical installations, while NFPA 70E offers guidance for safe electrical workplaces and operation of electrical equipment.
Together, they ensure safety against electrical shock and thermal hazards, advocating for devices like circuit breakers, fuses, and GFIs.
Therefore, the correct options are:
For NEC: 1) Safe electrical installations
For NFPA 70 E: 2) Safe electrical workplaces.
Step-by-step explanation:
NFPA 70E complements the NEC by highlighting the use of the three-wire system (live/hot, neutral, and earth/ground wires) which is fundamental to guarding against thermal and shock hazards by grounding the neutral wire and the case of the appliance.
Both of these documents emphasize the importance of using electrical safety systems and devices, such as circuit breakers and fuses, to interrupt excessive currents and prevent thermal hazards.
They also offer guidance for the safe operation of electrical equipment and safe electrical workplaces. This includes practices for working with or around electrical systems to protect workers from electrical shock and arc flash hazards.
Plastic insulation on live/hot wires helps prevent shock hazards by providing a protective barrier against accidental contact. Ordinary circuit breakers and fuses are primarily designed to prevent thermal hazards by interrupting excessive current flow.