We have used small SWA cleats on occasion, on others we have used copper MICC/FP200 P clips suitably reformed to match the tail diameter. Good call on the no ferrous saddles.

It's my understanding from both what DNO and metering people have told me, and chatting to other sparks, that the real reason here is to prevent undue strain or movement at the terminations, actual collapse of any reasonable length of meter tail is highly unlikely to endanger anyone or be significant. The only possible case I could see, which is plausible, would be where the head/meter were one side of the front door, and for some reason the CU was located the other side. Then the heated tails may well collapse in the event of a house fire, over a primary egress/access route, and metal clips would be absolutely essential.

We have used small SWA cleats on occasion, on others we have used copper MICC/FP200 P clips suitably reformed to match the tail diameter. Good call on the no ferrous saddles.

It's my understanding from both what DNO and metering people have told me, and chatting to other sparks, that the real reason here is to prevent undue strain or movement at the terminations, actual collapse of any reasonable length of meter tail is highly unlikely to endanger anyone or be significant. The only possible case I could see, which is plausible, would be where the head/meter were one side of the front door, and for some reason the CU was located the other side. Then the heated tails may well collapse in the event of a house fire, over a primary egress/access route, and metal clips would be absolutely essential.