For circuits without motor loads, what must be the minimum fuse size when using a time delay fuse?

The minimum fuse size for circuits without motor loads using a time delay fuse must be 125% of the continuous load plus 100% of the non-continuous loads. This ensures that the circuit can handle the continuous load safely while also providing additional capacity to accommodate any non-continuous loads that may occur.

Continuous loads are defined as loads that are expected to run for three hours or more, while non-continuous loads may run for shorter durations. By calculating the fuse size this way, the system is adequately protected from overload situations while still allowing for the flexibility to accommodate varying electrical demands.

Using 125% of the continuous load means that the fuse will not blow during normal operation of long-running appliances. Additionally, adding 100% of non-continuous loads ensures that there is an extra buffer in case those devices are used at the same time as continuous loads, preventing potential safety hazards or damage to the electrical system.