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The maximum number of 90° bends allowed in a length of Electrical Nonmetallic Tubing (ENT) between the panel and a box is determined by electrical code requirements, which help ensure safe and effective installation practices. In this context, allowing a maximum of four 90° bends helps to maintain the ease of pulling wires through the conduit without causing significant stress on them.
Each bending point adds resistance and the potential for complications when installing wiring, such as kinking or damaging the insulation. Limiting the bends to four allows for a more manageable installation, while still providing some flexibility in routing the tubing around obstacles. This balance is important to ensure that the installation remains practical while adhering to safety standards.
Understanding the constraints of bends in ENT is essential for anyone involved in electrical installations, as it not only helps to meet compliance requirements but also assures the longevity and safety of the wiring system.