600 AMPS on a 400 AMP Service? Is it allowed? How Electric works at an Apartment Building #electric

What happens here

This video features an electrician apprentice being quizzed by his boss about the characteristics and setup of a 400 Amp electrical service panel for a multi-unit dwelling. The discussion covers the service pipe size, meter socket amperage and position count, single-phase three-wire configuration, and the allowance for multiple disconnects without a main breaker based on electrical code. The video then briefly pans to show underground feeders coming from a transformer, highlighting various types of utility connections.