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View Full Document. Two Forcesâ resultant can be transferred to âOâ along with the moment caused by these forces at âOâ. But this force couple system cannot be replaced by single force at distance âdâ as the force has to be at âOâ as mentioned in problem. This preview has intentionally blurred sections.
According to the 2002 version of the National Electrical Code, any transfer switch that serves Emergency class load must serve no other loads. If loads other than Emergency class are to be served by a standby power source, at least two transfer switches will be required. Furthermore, a larger number of smaller-ampacity transfer switches provides greater protection against branch circuit failures, so more and smaller is a good general principle.