Type IMC shall be permitted to be unsupported when the raceway is not more than how many inches long?

Type IMC (Intermediate Metal Conduit) can be installed without support over short distances, which allows for more flexibility in certain applications. The specific length limitation for unsupported runs is 18 inches. This means that when the raceway does not exceed 18 inches in length, it does not require the additional support that would be necessary for longer runs. This provision is designed to facilitate easier installation in tight spaces and reduce the amount of hardware needed for short distances.

The code typically outlines these parameters based on safety considerations as well as practical installation guidelines. Exceeding this length would necessitate proper support to ensure stability and adherence to safety standards, preventing sagging or potential hazards from the conduit. Thus, understanding that IMC can be left unsupported for up to 18 inches can help electricians efficiently plan their installations while adhering to code requirements.