Which of the following is not a guideline for conduit use?

The guideline regarding the color coding of conduits is not a standard requirement in conduit use. While color coding can be beneficial for identification and organization, especially in complex installations, it is not universally mandated. The primary focus in conduit installation involves ensuring safety, protection of cables, and adherence to building codes.

The other guidelines are essential for ensuring proper conduit use. Having conduits free of cracks and damage is critical because any imperfections can compromise the integrity of the pathway for electrical or communication cables, potentially leading to failure of the system. Securely fastening conduits is necessary to prevent movement, which can cause wear and tear over time or lead to misalignment of the system. Lastly, compliance with local building codes ensures that all installations meet safety and performance standards set by authorities, which is vital for legal and operational purposes.

Overall, while color coding may enhance clarity in an installation, it does not constitute a necessary guideline for conduit use.