4mm alan head screws

[Adie moore]

in this image of an isolator the screws to tighten down on to the tails were 4mm alan heads. I wasn't happy at all, am I wrong? As far as I can see the main thing with am3 was to do with consumer unit fires which 9 times out of ten are due to bad connections.
with this isolator I don't know how much torque I could apply via a 4mm alan but it's not much and well less than a 6.5mm flat head screw driver. and I don't have insulated alan keys so my bum was twitching like a rabbit's nose.

edit; its a brand new meter and isolator.

 

[sam400]

I think it was 4mm key so M5 bolt, your get it pretty tight with a T bar.
A lot of those isolators only have PZ fasteners done up to 3nM so your prob fine.

 

[Resu]

Found an insulated Knipex T bar that a local DNO operative had dropped loading his van. Never saw him again so kept it. Best thing I ever found! We have quite a lot of those isolators up here and quite often the MET on the cutout (or Henley block) can be hex heads.

 

[Richard Burns]

I was informed by one UKPN operative that their guidance on tightening terminals was "as tight as possible" and since they were using the T hex keys that could be fairly tight, if 16Nm is the actual recommended torque perhaps this was not such a bad instruction as I originally thought.