I live in South Africa where we experience frequent power outages due to so-called "loadshedding". With this, there have been numerous cases of damage to appliances due to surges, usually when power is restored.

What causes these pulses/spikes on the line when the power is switched back on? Could you explain to me the most likely cause/mechanism behind this phenomenon?

  • \$\begingroup\$ Are the damaged appliances OLD equipment, with just motors and Honeywell timer/switches? or modern equipment with lots of microcontrollers that have weird startup states? \$\endgroup\$ – analogsystemsrf Jul 3 '18 at 3:47

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