Short circuit capacity

[TicklyT]

The characteristics of cast iron etc. do change with time. Processes including acid embrittlement (absorbsion of hydrogen) and precipitation hardening (changes to the crystal structure) take their toll.

Micro cracks originating from thermal expansion in the casting process, or the firing of the ceramic components, may propagate through the materials.

So at least two of the materials in the cutout become more brittle with age.

 

[ban-all-sheds]

OK - ta

 

[holmslaw]

..

 

[mikhailfaradayski]

flippineck bas, were you bored yesterday? this thread was dead for nearly 2 months....

 

[ban-all-sheds]

Just a bit slow to reply, that's all.

I'd lost both my round tuit and the plot.