Final answer:
The National Electrical Code (NEC) is the standard used to measure electrical installations in the United States.
Step-by-step explanation:
The National Electrical Code (NEC) is the standard by which electrical installations are measured in the United States. It provides guidelines and requirements for the safe installation and use of electrical systems. The NEC covers a wide range of topics, including wiring methods, equipment placement, and safety precautions.
For example, the NEC specifies the minimum number of outlets that should be installed in a room, the maximum height at which electrical switches can be installed, and the protection required for circuits.
By following the NEC, electrical installations can be done in a way that ensures safety and compliance with the applicable regulations.