Why type of interlocking uses a normally closed contact on the starter to lock out the other starter?

The type of interlocking that uses a normally closed contact on the starter to lock out the other starter is known as "electrical interlocking." This method ensures that when one starter is energized, its normally closed contact opens, preventing the other starter from being activated simultaneously. This configuration is commonly used in motor control circuits to ensure safe operation and prevent equipment damage due to simultaneous operation of motors or devices that could conflict with each other.