The only significant limit on available current is the circuit breaker. When it trips the current is extremely limited.
In a circuit of old fashioned filament light bulbs drawing 15 Amps steady state, that circuit will supply the 150 Amp turn-on current to the bulbs.
The ratings for breakers, wires, receptacles and such, is a continuous steady state rating. Continuous is this case is 3 hours. While hi-fi amplifiers draw peak power for only very short periods of time.