The dangers of electromagnetic radiation occur when humans works in the operation, following and maintenance of the transforms which causes their exposure to the electromagnetic field for long periods of time, and also when transformers are placed in the residential buildings its fields affects the health of all those living in this building. This paper aims to study the environmental and health dangers caused by the electromagnetic fields produced by the medium voltage transformers found in or near the residential and services buildings.Because of all the fears from the electromagnetic fields many researches and studies were performed, the world health organization started an international project to evaluate the environmental and health effects caused by the electromagnetic field with its different frequencies, many authorities