Answer :

To determine the most common service voltage for small commercial loads, let’s analyze the typical voltage levels used in different settings:

a. 120 volts: This voltage is widely used in residential settings for standard household appliances and lighting. It is less common for commercial services because commercial operations usually require more power than what 120 volts can comfortably deliver.

b. 240 volts: This voltage is frequently used for small commercial loads. It is suitable for a variety of small commercial appliances and equipment. This provides more power capacity than 120 volts, making it ideal for many small commercial applications.

c. 480 volts: This higher voltage level is typically used in larger industrial and commercial settings where there are high-power requirements. It’s less common for smaller commercial loads due to the need for more sophisticated infrastructure to manage and distribute this voltage.

d. 600 volts: While 600 volts can be used in certain industrial applications, it’s not as common for small commercial loads. Commercial environments that use 600 volts are usually handling very large and heavy equipment.

Given the above explanations, the most common service voltage for small commercial loads is:
b. 240 volts