Just before fitting them hold the two connectors ends the correct way up, just as if you’re about to plug them in. Check the large location lugs on the two Burndy connectors are facing upwards - one each end, see photo.
See my post #79 above, if you haven’t already. In my view, the NAC 332 is a very worthy improvement on the NAC 252 even without the additional power supply.
A number of years ago, before I downsized to the SN2, I had a NAC 252 / SuperCap which I used with a NAP 160 (which was fully serviced by naim HQ). Before that I had NAC 82 / 2 x HiCaps with the 160 power amplifier.
My experience with those systems leads me to the view that the new NAC 332 is the most capable and musical naim preamplifier I have heard in my system, even without the new external power supply.
It is up to others to do their own demonstration and decide for themselves - my decision is made!
They should have discussed cables with Puritan audio. Their Ultimate power cable is the softest most flexible cable I’ve seen. And the reason for this is lose cable transfer vibrations less than stiff. Something naim already know of course.