411A is referring to the regulatory requirements for the minimum acceleration height.
400 feet is a standard minimum regulatory accel height for most commercial transport aircraft, however it is not necessary that this height be adhered to.
For example at my operator we use 1500 feet as the standard minimum for all departures unless circumstances dictate the use of a higher minimum. This is for a medium jet. At my previous company we used 600 feet minimum for a medium turboprop.
The maximum acceleration height you asked about stancioui, has nothing whatsoever to do with the above.