In the electrical installation of my house there is no ground bar at the entrance. What danger is my electronic equipment in?
The danger is for your electronic as well as electrical appliances such as lamps, refrigerators, etc. What happens is that the ground bar is a protection for all equipment in case the ground or neutral wire of your home entrance is interrupted. This is the middle wire of the three wire installations. If this wire breaks, a voltage imbalance occurs in the other phases. One can easily exceed 150 V while the other drops to less than 70 V all depending on what you have plugged in the installation. Thus. Appliances in the phase where the voltage rises may be overloaded and burned. The earth bar prevents this.
