I am an electrical engineer working in singapore building construction industry....the myth that staying near to TNB substation is hazardous for health, is totally untrue....the electromagnetic field generated by the Low Voltage Main switchboard is very little and can be neglected ...hence, it is 100% safe staying next to TNB substation..... in fact, Singapore, which is very stringent in health related matter, many apartment units were built next to substation.... I never heard of any residents facing any health related matter.... as long as your home not built near 230kV Power station, it should be fine....