Thanks for that Nigel.
The DCC Concepts PSU2 is 18volts @ 5 amps & DCC Concepts say they use that all the time for their NCE Power Cabs.
https://www.dccconcepts.com/product/18v-dc-at-2a-uk-a-medical-grade-power-supply-for-dc-dcc-systems-2-5mm-dc-plug/
NCE say it should be 15volts @ 3 amps max so they both can't be right
https://ncedcc.zendesk.com/hc/en-us/articles/203935645-Adding-more-power-capacity-to-the-Power-Cab
Personally I think 18 volts @ 5 amps is to much for a Power Cab.
But I'm no expert so I bow to a higher power or should that be amps
Tony.