Just getting back to the subject of Pyro cables, I had the chance yesterday to work on some in an old country pub, that were used as Service lines.
The boy that I had working with me (An Apprentice Line Mechanic) said he had no idea they made cables like this. [Linked Image]
Then started a little bit of a tutorial in the Why's and What-fors of Pyro systems.
The newer ones (Pyro cables) over here are PVC served (sheathed) and I've seen the odd rodent teeth-marks on them out in the field.
There was also an Electrician who lost his registration about 6-7 years ago for making the outer sheath the B-Phase (R-Y-B) in a 3 Phase system.
He seriously injured another Electrician that was working on the system later down the track and stripped back the PVC serving. [Linked Image]
Like I said above, every Electrician should have a good grounding in all the cables and wiring systems that they are likely to encounter in thier normal course of work.
This would mean knowing how to test them, how to identify when the wiring is deteriorating and standard Insulation Resistances for the cables.
Sure, us guys as Electrical workers are generally "in the know" about these things, but how would Joe blogs with his DIY project have a clue, DIY books never go that far into Electrical systems.