#1 , can I use a MLO panel on the secondary side of a transformer ?
#2 , can I tap a generator bus ( before the main gen breaker) and pipe over 25' to a breaker (in the generator enclosure)and then to a load bank connection ?
#1 You can't feed an MLO panel from tap conductors. 408.36 requires the OC protection for the panel to be on the load side of the transformer.
That was not the question he asked though. He asked if he could use a MLO PB on the secondary side of a xfmr. That is perfectly acceptable.
#2 You might be able to make a case for article 240.21(B)(5) for the load bank conductors, if they are running underground.
That was not the question he asked though. He asked if he could use a MLO PB on the secondary side of a xfmr. That is perfectly acceptable.
Try it this way: You can use an MLO panel on the secondary side of a transformer. However, there must be an overcurrent protection device of some description (fused disconnect or enclosed breaker, to give two examples) between the transformer's secondary terminations and the panel's MLO terminations.
Let's backtrack these replies and say it is dependent on the transformer configuration and protection plus transformer secondary conductor protection. See 240.21(C)(1) and 408.36(B) Exception. Where both of those apply, it is conceivable to have an MLO panel connected directly to a transformer secondary.
Let's backtrack these replies and say it is dependent on the transformer configuration and protection plus transformer secondary conductor protection. See 240.21(C)(1) and 408.36(B) Exception. Where both of those apply, it is conceivable to have an MLO panel connected directly to a transformer secondary.
Which exception to 408.36 would allow a panelboard to be connected directly to a transformer without a main disconnecting means ?
Amazing what one finds when they turn the pageThe exception is in 408.36(B). It permits the Primary OCPD which protects the secondary conductors of a delta-delta transformer, for example, to also protect the secondary panelboard.