When sizing disconnect switches, the current or voltage rating should __________ the source's current or voltage.

The current or voltage rating of disconnect switches should equal or exceed the source's current or voltage to ensure safe and reliable operation. This requirement is vital because the disconnect switch needs to handle the maximum expected load without risk of overheating, damage, or failure during operation. If the rating were less than the source's current or voltage, it could lead to potential safety hazards such as electrical fires, equipment failure, or dangerous arcing conditions when the switch is in use.

Using a disconnect switch rated equal to or greater than the source current or voltage also aligns with electrical safety codes and standards, ensuring that the installation will function effectively under normal and fault conditions. Furthermore, this ensures that the switch can adequately interrupt the circuit under all possible load conditions without compromising safety or performance.