In alt.engineering.electrical Andrew Gabriel wrote:

| I'm referring to the transformer regulation (and also the LV
| supply cable voltage drop) response to load changes. E.g. if
| I switch on my 10kW shower, that's a 0.1% change against the
| max load of my 1MVA substation transformer and therefore
| makes no perceivable difference to the voltage in my house.
| If I were to try that on a US 50kVA transformer, that load
| is going to trigger a change of 20% of the transformer
| regulation, which is much more significant and would
| certainly be visible as a brightness change in light bulbs.

What is the available fault current in these situations?

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