In case of electricity - "в случае, если на терминале обнаружено электричество" или как это понимать?

Из руководства по электронному управлению

* 'To avoid (electric shock/electrocution), do not touch the control terminal';

or possibly

* 'Do not touch the control terminal if it is live' [where 'live' (произн. "лайв") = 'под напряжением'].

This excerpt, together with the other excerpts from the document that you've posted more recently, suggest that it's been written by someone without native-level English. The English in it = around 7-8/10.