Automatic Light on Shabbat
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Question
I am in an apartment building abroad, and when you pass through the hallway exiting the building, a light turns on. Will it be forbidden for me to leave and enter the building on Shabbat because of this?
Answer
Shalom and blessings
Indeed, it is forbidden for you to leave and enter if the light turns on because of you.
It is permitted to leave when the light is turned on by a non-Jew passing there for his own needs.
It is also permitted to call a non-Jew to ask him for something, and then you can pass. This permission is only valid if the non-Jew does not know that you are calling him so that the light will turn on.