Even under normal conditions the ma

Even under normal conditions the mains current can reach levels up to 60 A (230 V), 120 A (120 V) and 140 A (100 V), respectively; this could cause lamps to flicker if connected to the same mains as the amp. The impedance of the AC circuit should be less than 0,157 Ohms to avoid flicker according to EN61000-3-11 “Electromagnetic compatibility – Part 3-11:
Limits – Limitation of voltage changes, voltage fluctuations and flicker in the public low-voltage supply systems – quipment with rated current ≤ 75 A and subject to conditional connection”. If in any doubt, consult your local power provider. Never attempt to measure this impedance level with your ohmmeter. This may damage your meter and expose you to the risk of electric shock!