Question:
Can one turn on a washing machine a minute before shkiah erev rosh chodesh av if it will start then but finish well after nacht?
Answer:
If it will finish after it is nighttime, although some poskim permit it, according to many poskim it is not permitted.
Sources:
Shevet Hakehosi 1-171, Mbais Halevi 13 pg. 27, Nitei Gavriel 35-15, Ko9vetz Halachos 11-1.
