Engine 2014: Electricity

1. A electrical interlocking with the normally closed low speed and high speed contactor auxiliary contacts only
2. B electrical interlocking with the normally closed low speed and high speed start pushbutton contacts only
3. C mechanical interlocking with the low speed and high speed contactors only
4. D electrical interlocking with the normally closed low speed and high speed contactor auxiliary contacts and the normally closed low speed and high speed start pushbutton contacts

Tip: press A-D to answer