For purposes of the NEC®, interior metal water piping is considered to be exposed when installed above a lay-in ceiling.

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Multiple Choice

For purposes of the NEC®, interior metal water piping is considered to be exposed when installed above a lay-in ceiling.

Explanation:
The main idea is how NEC defines what counts as exposed versus concealed. When interior metal water piping is installed above a lay-in (suspended) ceiling, it sits in the plenum space above the finished ceiling and is not behind a permanent wall or other finished surface. That space can be accessed by removing ceiling tiles, so the piping is not concealed. Because it isn’t hidden behind a finished enclosure, NEC treats it as exposed for purposes of applicable requirements (such as support, protection, and accessibility). Therefore, the statement is true.

The main idea is how NEC defines what counts as exposed versus concealed. When interior metal water piping is installed above a lay-in (suspended) ceiling, it sits in the plenum space above the finished ceiling and is not behind a permanent wall or other finished surface. That space can be accessed by removing ceiling tiles, so the piping is not concealed. Because it isn’t hidden behind a finished enclosure, NEC treats it as exposed for purposes of applicable requirements (such as support, protection, and accessibility). Therefore, the statement is true.

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