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In the context of switchboard installation, specific permissions for altering clearances can be granted only with written approval. This is crucial because electrical installations must adhere to established safety standards and regulations. Clearances are designed to ensure safe operation, maintenance, and access to equipment, minimizing risks of electrical hazards.

Having written approval creates a formal record that details the circumstances around the modification, helping to prevent miscommunication and potential safety violations. This process allows for oversight by qualified personnel who can assess the impact of the clearance alterations on safety and compliance with industry standards. In many jurisdictions, regulatory frameworks mandate that clearances should not be altered without such documentation to ensure accountability and adherence to safety protocols.

Other reasons why this option is appropriate include the need for adherence to the National Electrical Code (NEC) and local codes that dictate installation practices. These codes specify clearances to help manage heat dissipation, accessibility for maintenance, and overall safety in the event of equipment failure or emergency situations.