Friday, November 25, 2005
The Rambam considers a tzuras hapesach a valid mechitzah only when utilizing at the minimum two mechitzos that are omed merubeh al haparutz (Shulchan Aruch, O.C. 362:10). Where this is not the case, each pole can be no more than ten amos apart from the other. The Kaf HaChaim (362:92) quotes the sefer Minchas Yehudah (siman 26) that states if a city has omed merubeh of its houses, they can be used to qualify the tzuras hapesachim as a Rambam eruv. Since the proximity of property lots in Brooklyn is such that they are omed merubeh al haparutz ― particularly the fences that surround the property lots ― any eruv in Brooklyn would be considered a Rambam eruv.