The high level electric field intensity produced by high voltage (HV) equipments inside 500/220kV
substations is harmful for the human (staff) health. Therefore the minimum health and safety requirements
regarding the exposure of workers to the risk arising from electric fields produced inside these substations
is still considered as a competitive topic for utility designers, world health organization (WHO) and
biomedical field researchers. It is very important to have knowledge about levels distribution of electric field
intensity within these high voltage substations as early stage in the process of substation design. This
paper presents results of investigation 50Hz electric field intensity distribution inside 500/220kV power
transmission substations in Cairo, Egypt. This paper presents a method for assessment the distribution of
50HZ electric field intensity distribution inside this substation, this method of analysis is based on the
charge simulation technique (CSM). This study will serve for planning service works or for inspection of
equipment on HV power transmission substations.