(NOTE version : K8rc2 )
AND
you probably want a wider copper pour clearance on an inner layer … sooo
(rule "HV zone clearance inners"
(layer inner)
(condition " A.NetClass == 'HV' && B.Type=='zone'")
(constraint clearance (min 1.0mm)))

and you probably want a general smaller clearance, perhaps, this would need to go before the zone clearance so zones are hooked as the last thing it checks
in this order
(rule "HV general clearance inners"
(layer inner)
(condition " A.NetClass == 'HV' ")
(constraint clearance (min 0.7mm)))
(rule "HV zone clearance inners"
(layer inner)
(condition " A.NetClass == 'HV' && B.Type=='zone'")
(constraint clearance (min 1.0mm)))
you can see it applying the smaller clearance boundary thin green line for other than zones

Hey gkeeth I am getting the hang of this !