Well,
1) PSTN
2) SWCH
3) Powered elements
4) Etc...
Basically, there are things that only PSCN, NSCN, and METL (i.e. all the MELTABLE metals) can do.
tpt.el.pscn.maxtemperature=10000.10
tpt.el.nscn.maxtemperature=10000.10
tpt.el.metl.maxtemperature=10000.10
Thanks...