When selecting electric cable size for alterations, what criteria should be considered?

When selecting electric cable size for alterations, it is crucial to consider current-carrying capacity and allowable voltage drop. The current-carrying capacity refers to the maximum amount of electrical current a cable can safely carry without overheating. This ensures safety and efficiency in the electrical system, preventing potential hazards like cable damage or fire.

Allowable voltage drop is another vital factor, as it accounts for the reduction in voltage that occurs due to resistance in the conductors over the length of the cable run. Excessive voltage drop can lead to inefficient operation of electrical devices and systems and may result in malfunction or reduced performance.

By ensuring that the cable size is appropriate for both the amount of current it will carry and the distance it needs to run, one can maintain the integrity and reliability of the electrical installation. This approach addresses both operational needs and safety standards, making it the most comprehensive criterion for selecting cable size during alterations.