Low-voltage electrical combination should comply with what kind of rules?
A. heating element installed in a well-cooled position;
B. fuse melt specifications, automatic switch settings meet the design requirements;
C. switching platen contact is good, there is a safe distance between the adjacent platen, switching, do not touch the adjacent platen;
D. Signal circuit lights, buttons, light plates, bells, electric flute, accident, such as the clock and signal display accuracy;
E. The housing must be grounded (PE) or connected to zero (PEN), the connection is reliable;
F. The terminal block is securely installed. The terminals are numbered, strong and weak. The terminals are isolated and the terminal specifications are matched with the cross-sectional area of ​​the core.
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