UPS - Uninterruptible Power Supply - No break system - Double conversion - Off-line UPS - Line-interactive UPS - Buck- and boost transformator - SoHo market - Rackmount UPS - autonomy time - Battery capacity - Powerdip - Grid contamination - Emergency Power Generator - EPG - emergency power diesel unit - Mains voltage stabilizers - Line conditioner - Switched-mode power supply - Lineair power supply - Voltage fluctuations - Transformer - Powerconditioner - High frequency - Peak load - Lightning site - Low impedance - Earthing - Earth leakage circuit breaker - Electrical resistance