Commentary for Eruvin 8:8

גְּזֻזְטְרָא שֶׁהִיא לְמַעְלָה מִן הַמַּיִם, אֵין מְמַלְּאִין הֵימֶנָּה בְשַׁבָּת, אֶלָּא אִם כֵּן עָשׂוּ לָהּ מְחִצָּה גָבוֹהַּ עֲשָׂרָה טְפָחִים, בֵּין מִלְמַעְלָה בֵּין מִלְּמַטָּה. וְכֵן שְׁתֵּי גְזֻזְטְרָאוֹת זוֹ לְמַעְלָה מִזּוֹ. עָשׂוּ לָעֶלְיוֹנָה וְלֹא עָשׂוּ לַתַּחְתּוֹנָה, שְׁתֵּיהֶן אֲסוּרוֹת עַד שֶׁיְּעָרֵבוּ:

A balcony projecting over the water — it is forbidden to fill up from it on Shabbath unless they make a partition in it ten tefachim high [all around the balcony or all around the hole, four by four, hollowed out in its midst; for we say that we perceive the partition as extending downwards], either above [the hole in the balcony] or below, [i.e., attached to the balcony from below. Rambam explains: "below" — on the water opposite the hole of the balcony. For we say that we perceive the partition as extending upwards, as if it reaches to the hole in the balcony from which it is filled.] Likewise, two balconies, one above the other, [and the hole from which it is filled in the upper aligned with the hole in the lower] — if they made (a partition) for the upper [i.e., if the men of the lower were partners with those of the upper to make a partition in the upper], and they did not make one for the lower, both are forbidden until they make an eruv, [for since those of the lower are partners in the partition of the higher, they (the lower) forbid them. And if they made a partition for the lower and did not make one for the higher, even if the higher has no partnership in the partition of the lower, they are both forbidden: the higher, because it lacks a partition; and the lower, because the upper has a "path" through it, it, too, filling up water from there, so that the upper forbids the lower until they (the men of the upper) make an eruv with it (the lower). This, when the two balconies are ten tefachim or more distant from each other. But if they are within ten tefachim of each other, even if both made a partition, they forbid each other until they make an eruv.]

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