The building always installs an exploration controller into line place (explore only do not take off buckle control) , the detector of three-phase electric current that chooses parameter to suit and detector of odd electric current (schism type or combined-type) . According to the 2nd part in national level GB14287.2-2005: Type of odd electric current is electric the of 4.2.2 regulation of fire monitoring detector:  of ň of the Yang that tell Hun blocks?0mA of brandish π ∮ , should not be more than 1000mA, and detector calls the police the value is calling the police between the 80%-100% that set is worth. According to this requirement, general electric current is a the rest that always manages into the line surely 400 ～ 800mA.
2 class are installed to explore controller on the 2 class switch of ark of distribution of every spur track, the detector of three-phase electric current that choice parameter suits and detector of odd electric current.
To electric current and detector of odd electric current choose, recommend 4 syncretic above all (detector of 3 electric current and a combination of detector of odd electric current) detector. Can choose according to norms of breaker of carapace of distribution box model commonly corresponding the model of detector of 4 syncretic electric current cooperates to it. Normally road of 2 grading electrical wiring (trunk) the exploration warning apparatus that go up should choose 400mA of ～ of IΔn=100 of electric current of rated and odd movement, time of delay time movement is in the product of 0.2~0.5S (note: Ji whizs  returns 腎 after the spot is measured, Δn can be adjusted, delay time 0.2S, pull open behavioral time to differ, can avoid to be protected with extreme at the same time movement) ; In addition, be opposite to get used to system of fire alarm of leakage of electricity the control function of low-pressure distribution system, model carapace breaker should deserve to minute of encourage is taken off buckle implement, take off buckle voltage appropriate to be 24V DC. Center the couplet net bus line between warning apparatus to monitoring center to avoid warning apparatus local short circuit causes some return or whole system breaks down, answer to add short circuit isolator on loop, general warning apparatus of 5 leakage of electricity installs every 3 ～ , also some products ask every bus line is ramose set. The delay time time in issueing a watch to be GB13955-2005 appendix recommends a value.
The delay time time that 2 class protect
2 class are protected One class is protected End class is protected
Delay time time recommends a value / S 0.2 Without delay time
Note: The class difference of the delay time time of protector of movement of delay time odd electric current is 0.2s.
The delay time time that 3 class protect
3 class are protected One class is protected Intermediate protection End class is protected
Delay time time recommends a value / S 0.4 0.2 Without delay time
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