In a way that can avoid the risk of accident is why short circuit during normal use. And in a complex fault error when installed and maintained according to the product owner.
In a manner that can avoid the risk of accidents due to short circuit during normal use. Also, in single fault condition when installed, maintained by the owners were determined.
In such a manner that it can avoid the risk of accidents of short circuit during normal operation. And in a state of fault and maintenance simple when installed as the product formulation.