guesstimate max current of a domestic appliance
For most purposes, the steady-state current, 1000 W / 250 V = 4 A, is all you need to be concerned about. If you can't see the transient with an analog ammeter, you probably don't need to worry about it. Even if you can see it, a transient that is on the order of 150% for a couple of seconds is probably not of much concern. The transient magnitude and duration should be no problem for the power cord, branch circuit wiring or branch circuit-breaker. The internal part markings indicate standard parts that have ratings that exceed the requirement. Many components are made only in a few, fairly widely spaced, current ratings.

For estimating purposes, look up the temperature coefficient of resistance for tungsten and see how much the resistance changes between room temperature and incandescence.

It appears that a driver for an incandescent lamp needs to handle 10 times rated current for 3 to 5 ms. PDF Link A controller may need a current limiting scheme.