well if the motors dont run at the same time where is the overload but like i said earlier this so called rule of thumb seems to work and i am not getting a whole lot of answers disproving it but just alot of people saying its wrong and not giving no real facts making it wrong
Nothing about adding up breakers in 408.
III. Panelboards
408.30 General. All panelboards shall have a rating not
less than the minimum feeder capacity required for the load
calculated in accordance with Part III, IV, or V of Article
220, as applicable.
Informational Note: See 110.22 for additional requirements.
408.36 Overcurrent Protection. In addition to the requirement
of 408.30, a panelboard shall be protected by an
overcurrent protective device having a rating not greater
than that of the panelboard. This overcurrent protective device
shall be located within or at any point on the supply
side of the panelboard