How to Prevent and Avoid The Danger of Arc?

The following reasonable steps can not only increase understanding of the risk of arc flash, but also help protect yourself and the people around you from being hurt.

1. Hazard analysis of arc flashover of equipment:

Determine whether the risk of flashover is present and the line of protection (FPB) for flashover protection, and the protective equipment that personnel should use to enter the boundary.

The calculation of flashover protection boundary line FPB can be calculated by using NFPA 70E and other application software programs.

2. Collect data: 1) possible short circuit current at contact point.

2) Rated voltage. 3) the maximum total disconnection time of equipment protection. 4) working distance. 5) the existing grounding mode. 6) the type of protection device (including module number and setting).

3. Calculate the incident energy of the human body: IEEE 1584-2002 Guide -

The implementation of flashover hazard analysis can be used to determine the FPB, the incident energy at the working distance and the demand for PPE. It can take advantage of many application software processes. The incident energy is shown in calorie / square centimeter after calculation. Calories/cm2.

4. Choose the right PPE (personal protective equipment): proper selection of PPE is the key to protect workers from injury. In calculating the incident energy, the cal/cm2 obtained must be compared with the PPE considered. The flashover protection equipment before 2000 has not been clearly marked for its arc rating.

5. Device is clearly marked with a flash warning sign: the revised version of the NFPA 70 in 2002, the new equipment in the field, if the danger warning should be marked if the cover is removed.

6. Education training: OSHA and NFPA 70E require that workers in charged or near live systems must be qualified workers, appropriate and effective learning flashlight knowledge, workers must receive training, understand the meaning of the symbol and how to use information on the application equipment.