MIC / Pyro Cable help

Pyro has a failure mode where a transient causes a flashover that develops into a power arc. So either VDRs or sometimes capacitors were fitted as surge arrestors on highly inductive circuits. I've used VDRs where large contactors were fed from light-duty cables. It was often just a precaution and not strictly needed.

As for the stripping tools, all the variants except the Joistripper existed when I was learning in the mid 80s, I'd have to look at the catalogues to work out the timeline. IIRC the three editions of the Electrician's Mate all list different tools.

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Lucien Nunes said:

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Bit of thread necromancy; collection of MICC tools arrived today, looking to find replacement blades and how to change them; Joistripper seems easy enough, it's the ringer I can't figure how to change as it just appears rivetted.

Would be interested in that publication mentioned earlier

The wheel on the ringing tool doesn't really wear out, not least because it doesn't get used much, so shouldn't need changing. It's only useful where you can't get a regular stripping tool in or the cable is distorted or whatever makes it necessary to strip with side cutters or a fork. I have been known to use a Monument mini pipe cutter but obviously the point is not to cut through or make too much of an inward bevel but just to weaken the sheath so that the peeling stops in the right place with a square end.

When using a Joistripper or ZSU, just hold the sheath in a pair of pliers and as the tool body runs up against the side of the pliers it will strip the last turn square and clean. Plier position is 3/4 inch from end for ZSU and Joistripper, 1/2 inch for ZSUS.

Setting tbe blade position correctly in a Joistripper makes all the difference between zipping along and being useless. Replacement Joistripper blades code ZSJB but you can hone them on a stone if if you can support at the correct angle. Wheel stripper spare blades are ZSUB and ZSUSB, I've never even considered sharpening these!