Is a Main Breaker required

[KWH]

On a seperatly derived system , the breaker panel on the step down side is a main required or does this still fall under the 6 throws or less rule.

 

[jumper]

Unless you meet one of the exceptions, which I do not think this install may:

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.

 

[jumper]

I forgot to add this:

408.36(B) Supplied Through a Transformer. Where a panelboard
is supplied through a transformer, the overcurrent protection
required by 408.36 shall be located on the secondary side of
the transformer.
Exception: A panelboard supplied by the secondary side
of a transformer shall be considered as protected by the
overcurrent protection provided on the primary side of the
transformer where that protection is in accordance with
240.21(C)(1).