Substation and MCC walkthrough: isolate and protect
A walkthrough of the free Substation and MCC lab: read the single-line diagram, isolate a motor bucket safely, size a circuit and grade a relay.
Try this in the Substation and MCC labAbout the Substation and MCC lab
Chapters
- 0:00 The switchroom
- 0:12 Isolate safely
- 0:28 Size and protect
- 0:35 Eight levels
Transcript
Step into a small substation and motor control centre. Free, in your browser. Start with the single-line diagram. Name every device and its rating. Now isolate a motor bucket. Stop, open, withdraw, lock and tag it. Prove your tester on a live source. Test the bucket dead. Prove the tester again. Earth it, sign the permit, and only then start work. Size a motor circuit: cable, breaker and overload relay. Then grade a protection relay. Eight levels, from the drawing to a motor that keeps tripping, each a work order. It is practice for students, apprentices and electricians who want to work carefully. Each ends in an automatic acceptance test. Open the MCC lab free.