According to NEC Section 230.6, conductors installed under at least 2 inches of concrete are considered to be outside the building.
In the National Electrical Code (NEC), Section 230.6 specifically addresses the location of service conductors. Service conductors are the cables or wires that supply electricity from the utility company's distribution system to a building.
According to this code section, when service conductors are installed under at least 2 inches of concrete, they are considered to be located outside the building. This means that they are subject to different rules and requirements compared to conductors installed within the building.
The purpose of this requirement is to ensure that service conductors buried under a concrete slab have adequate protection and are treated as exterior wiring. By considering them as being outside the building, it allows for proper installation methods and adherence to other relevant code requirements for exterior wiring, such as grounding and protection against moisture and mechanical damage.
It is important to note that this requirement may vary in different jurisdictions, as local electrical codes can have additional or modified rules. Therefore, it is always essential to consult the specific electrical code adopted by the relevant authority having jurisdiction to determine the exact requirements for conductors installed under concrete in a particular location.