For transformers rated 1,000 volts or less, the secondary overcurrent protection devices can be up to how many in number?

For transformers rated 1,000 volts or less, the secondary overcurrent protection devices can be up to how many in number?

• A. Two
• B. Four
• C. Six
• D. Eight

Answer: (C)

The main idea is how many separate secondary protection devices are allowed on a transformer that’s rated at 1,000 V or less. When a transformer serves multiple secondary circuits, you can protect each circuit with its own overcurrent device, but the total number on the secondary is capped. That cap is six, which lets you have up to six separate secondary protections while keeping protection coordinated and practical. If you have more than six secondary circuits, you’d need to adjust the protection approach, such as protecting some conductors from the primary side or using separate transformers. So the maximum allowed is six.

The main idea is how many separate secondary protection devices are allowed on a transformer that’s rated at 1,000 V or less. When a transformer serves multiple secondary circuits, you can protect each circuit with its own overcurrent device, but the total number on the secondary is capped. That cap is six, which lets you have up to six separate secondary protections while keeping protection coordinated and practical. If you have more than six secondary circuits, you’d need to adjust the protection approach, such as protecting some conductors from the primary side or using separate transformers. So the maximum allowed is six.