Note: each current ratio of special terminal apparatus safety factor when the "a" side and the second strain than the short end terminal, otherwise will cause factor is not eligible.
Note: do instrument security factor for each current ratio is set at a special terminal "A" side and the secondary strain than the end of the short circuit terminals. Otherwise, the meter factor failed.
Note: the coefficient of the instrument for each current ratio when special terminal "A" end and two times the corresponding ratio of end terminal short circuit, otherwise it will lead to unqualified instrument coefficient.