Which fuse rating is NOT considered to be a standard fuse size by the NEC?

The National Electrical Code (NEC) sets forth standards for various electrical components to ensure safety and reliability in electrical installations. Standard fuse ratings are essential because they help prevent overloads and ensure that circuits are adequately protected.

In this context, a fuse rating of 115 amps is not considered a standard size. The NEC typically specifies fuses in increments that are more commonly used in residential and commercial electrical systems, usually ranging from smaller values like 15, 20, 25, 30, and 60 amps, up to larger values like 100 amps. While there are applications that might use fuses larger than 100 amps, 115 amps is not typically included in the standard sizing, making it less common and not widely recognized within standard electrical practice.

Both 20 amps and 30 amps are standard fuse sizes, typically used for branch circuits in residential applications. A 35-amp rating, while less common, can sometimes be found in specific scenarios, but it is recognized more than 115 amps within certain installations. Therefore, the selection of 115 amps aligns with the understanding of standard fuses as described by the NEC.