OK,
Emilio,
Sorry that it has taken me so long to reply to your post.
I am now in a position to give you a good reply to your Question.
There are different Classes of Insulated Gloves according to ASTM, these are below:
  • Class 0- Red coloured, P-P voltage of 1000V RMS
  • Class 1- White coloured, P-P voltage of 7500V RMS
  • Class 2- Yellow coloured, P-P voltage of
    17kV RMS
  • Class 3- Green coloured, P-P voltage of
    26.5 kV
  • Class 4-Orange coloured, P-P voltage of 36 kV.

Emilio,
Get Class 0 and Class 1 Gloves and look after them!.
As a Liney over here, I use Class 4 Gloves and very heavy Outers.
But as a note, you should never use Insulated Gloves as an excuse for poor Safety Practices.
In that, I am saying that you should isolate as far as you can go or do the work at another time, as far as HV work is concerned.
This type of work is very dangerous, as I have 12 years experience in it, up to 66kV, LIVE.