Which electrical rating should plug fuses of the Edison-base type not exceed?

The correct rating for plug fuses of the Edison-base type should not exceed 125 volts. This standard is based on safety considerations and the typical voltage used in residential and light commercial settings. Edison fuses are designed to provide protection for circuits at this voltage level, ensuring they can adequately handle the current without posing a risk of overheating or electrical failure.

Using fuses with a rating higher than 125 volts could potentially lead to dangerous situations, as they may not trip or blow appropriately when overcurrent conditions occur. Frequent overloads could result in damage to both the fuse and the connected electrical appliances, which is why it is essential to adhere to the specified voltage rating to maintain safety and functionality within electrical systems.

The other choices exceed this critical rating and, therefore, would not be appropriate for effective protection in standard applications using Edison-base fuses.