Shabbat: N-P (Nails, Non-Jews, Pumps)
NAIL CUTTING
You may not bite your nails or have them cut on Shabbat (and Jewish festivals). If you have a broken nail, you may ask a non-Jew to cut it off for you if it bothers you.
NON-JEWS
Asking Non-Jew To Do Melacha D'Oraita
You may not ask a non-Jew to turn ON a light or turn ON heat, or other d'oraita violations of Shabbat--even for a mitzva or for oneg Shabbat. However, you may ask a non-Jew to do a melacha d'oraita for any of a sick person's needs, even if there is no danger to the person's life.
NOTE: You may tell a non-Jew to do melacha, even if it is d'oraita, for a mitzva or oneg Shabbat only if it is bein ha'shmashot (between sunset and dark).
Asking Non-Jew To Do Melacha D'Rabanan
You may directly instruct or ask a non-Jew to do melacha d'rabanan for you on Shabbat, but only:
To prevent a large financial loss.
NOTE: A large loss is subjective to the individual's actual wealth and also to that person's perception of what is a large loss. Consult a rabbi.
For Shabbat needs.
EXAMPLE: You may ask a non-Jew to unlock an electric hotel door or trigger an entrance door on Shabbat, since this is for a Shabbat need and the action is not prohibited d'oraita.
SITUATION: A new guest arrives and you need the space on the table occupied by your Shabbat candlesticks.
WHAT TO DO: You may not move the candlesticks, but you may ask a non-Jew to do so.
SITUATION: You left a non-muktza item that you now need for Shabbat on a tree branch (or a child left one in a tree house).
WHAT TO DO: You may not climb the tree to retrieve the item, but you may ask a non-Jew to retrieve it.
EXAMPLE: You may ask a non-Jew to turn on air conditioning.
EXAMPLE: You may ask a non-Jew (directly, no need to hint) to turn off a light if it interferes with someone's sleeping.
To allow doing a mitzva.
For other pressing (and certainly for life-threatening) needs, such as health, even if the person not sick.
NOTE: All of these are d'rabanan cases!
Hinting to a Non-Jew To Do a Melacha
You may hint or imply that you need something done in order to induce a non-Jew to do even a melacha d'oraita that will benefit you, but only if you don't need that action.
EXAMPLE: Turning off a light; bringing a chair from outside an eruv.
Non-Jews: Melacha Bein HaShmashot
You may tell a non-Jew to do melacha for Oneg Shabbat.
PUMPS
Well Water
You may use water from a pump-operated well on Shabbat (as on Jewish festivals), as long as the pump operation is not a psik reisha (inevitable and immediate consequence of using any water tap).
EXAMPLE: You may use water from a well if it comes via an automatic pump that operates to fill a reservoir once the water level drops, but you may not:
Operate the pump directly.
Turn the pump on or off.
NOTE: If there are variants to this situation, ask a rabbi.
Copyright 2015 Richard B. Aiken. Halacha L’Maaseh appears courtesy of www.practicalhalacha.com Visit their web site for more information.