Quick question on 272/555PS(non DR) setup, when a 555PS is already connected to the 272 via a burndy cable, is it necessary to connect the original powercord at the same time?
thanks
I believe the 272 is fully powered by the 555 therefore will not require a power lead directly connected.
No.
In fact it may be worse than no! It might be don’t do it at all.
For example you must not feed an ndx2 via a xpsdr and the regular IEC supply. The fuse in the ndx2 don’t like it.
The manual or naim website should advise here.
Oops, yours is actually for the correct device! 
Deleted my wrong one
Your wrong one reminded me to check that I had my xpsdr burndy the right way 'round though!
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