What is the smallest permissible size of hard-drawn copper wire for a service drop?

The smallest permissible size of hard-drawn copper wire for a service drop is No. 10. This size is important because service drops must be capable of carrying the necessary current without overheating or causing safety risks.

In electrical installations, the sizing of conductors is governed by the National Electrical Code (NEC) and related standards, which specify minimum sizes to ensure safety and functionality. No. 10 hard-drawn copper wire provides adequate strength and conductivity for typical service drop applications, making it suitable for carrying the electrical load required in most residential and commercial settings.

When assessing other sizes, such as No. 8, No. 12, or No. 14, they either exceed the minimum requirement or fail to meet it, with No. 12 and No. 14 being too small for reliable use as a service drop.