[Avodah] What Do French Jews Do On Shabbath?

[Ben Waxman via Avodah]

I can't answer all of your questions but I can throw out one possibility 
for one issue, the motion detectors. Rav Rabinovitch has ruled that the 
basic issue with these devices are "ovdah d'chol".  The source below 
gives his reasoning. People who learned in Maale Adumim have told me 
that he is very clear about this psak.  Therefore, RR concludes that any 
device set off when someone passes by these devices is not a problem.

http://ravtzair.blogspot.co.il/2014/07/blog-post_6.html

On 2/17/2016 6:15 PM, Jay F. Shachter via Avodah wrote:
> There is also no way you
> can avoid paskening that the motion detector is a psiq reisha dnixa
> leh, unless you pasqn like Sholomo Zalman Auerbach and the
> Conservative movement that it's okay to use electricity on Shabbath,
> but incandescent lights are esh no matter how you turn them on,
> fluorescent lights may be another matter.