What are the characteristics of the coefficient of need method and the binomial method for determining the calculated load of a group of electrical equipment? Each applicable to which occasions

A: the need for coefficient method to calculate the load, characterized by simple and convenient, the results are more in line with reality, and long-term use has accumulated a variety of equipment need coefficients, so it is the world's countries are generally used in the basic method. Binomial method is characterized by both the average load taking into account the power equipment, but also consider a few of the largest power equipment caused by the additional load, the results of its calculations than by the coefficient of need method is much larger than the results of the calculations, applicable to the capacity difference between the load calculation of the power equipment.