I've re-read the original post and the OCPD size on the primary was not mentioned and I don't believe that SJT posted it in any of his follow ups.
That being the case, I'll stand by my answer if the primary side OCPD exceeds 60 amps. If the primary OCPD is 60 amps or less, I definitely agree that there can be as many OCPDS of any size on the secondary side as you can afford to buy, keeping in mind that all conductors must be protected.
I believe that Don's answer is correct, there will always be an OCPD on the secondary of a delta-wye connection and that it is there for the protection of the conductors , not the transformer, as long as the primary side OCPD does not exceed 125%.
In a left-handed way (no insult meant to you southpaws), Tesla is correct that an inspector will write a violation if there is no OCPD device on the secondary side of a delta-wye, but it isn't required to be there for the protection of the transformer.
Last edited by Tom; 02/21/10 08:52 PM.
