FWIW.
We make power electronic equipment.
This the wording on one of the warning labels we attach to the panels.
Typically we have discharge/sharing resistors that have a CR time constant of not more than 30 seconds. But you also need to consider the possibility of the failure of a discharge resistor failure or it's connection.
The only way to be sure is to measure the capacitor voltage.
It is a simple precautionary step.
I'm a little surprised that no one else has advocated such a simple safety measure.
We make power electronic equipment.
This the wording on one of the warning labels we attach to the panels.
There is always a similar warning on the front sheet of the Operation and Maintenance manual.This equipment contains power capacitors.
Before working on it:
Remove all supplies
WAIT AT LEAST TEN MINUTES
Check that all capacitors have discharged
Typically we have discharge/sharing resistors that have a CR time constant of not more than 30 seconds. But you also need to consider the possibility of the failure of a discharge resistor failure or it's connection.
The only way to be sure is to measure the capacitor voltage.
It is a simple precautionary step.
I'm a little surprised that no one else has advocated such a simple safety measure.