The necessity of electricity safety as a welder, in addition to the international practice of cold pressing terminals tied, pressed, touch, fall, wipe, its more important also have electric shock accident damage. Because electricity can not be seen touch, so the Ministry of Labor and Social Security of the State welder included in the first technical work, where the work related to electricity, must be particularly to ensure safety, can not take life, industry chain when the situation, not to save effort to find the heart, to abide by life defense. Prevention is the leading, safety is the first, safety is not forgotten, nip in the bud, the alarm bell is always ringing, remind others also need to warn yourself. Safety is a big thing that relates to the common interests of the team and themselves. Therefore, safety risks can not be ignored or neglected. It is a required course to carry out safety knowledge classroom teaching for welder staff.

Cold pressed terminals assess the safety of an enterprise or its own four standards

(1) There is no death or injury caused by electric shock;

(2) No inverted rod disconnection and cross-stage electric jumping incidents;

(3) No electrical equipment is stolen or destroyed;

(4) There is no electric fire incident.

The short-circuit fault problem is that the phase (fire) line and the phase line, the phase line and the zero line, the phase line and the shell or the ground immediately touch together, and the control loop is immediately formed without the power consumption of the machine and equipment. This kind of situation is of great risk.

Second, in the three-phase four-line power supply system, it is afraid of breaking the zero line. When the three-phase load spreading of a house is unbalanced, the three-phase current will be connected through the middle of the load.

When the neutral point is energize, the working voltage of the phase with small load (large characteristic impedance) is correspondingly high. Sometimes the DC voltage becomes the phase voltage, and the working voltage of the phase with large load (small characteristic impedance) is very low.

When all kinds of cold pressed terminals load imbalance, the greater the difference, the small characteristic impedance of a phase bulb will whiten or even burn out.

Natural also can drag down electrical products, produce higher loss.

Other, in the whole process of connecting the front, we must prevent the zero line and phase line replacement inserted wrong, produce 220V power supply system;

This is also the most risky power supply system incidents, the staff must be careful to prevent power supply system incidents.