What is the minimum threshold for a wood fire (medurah) kindled before Shabbat to be permitted for use on Shabbat?
Synopsis
A wood fire kindled close to nightfall may only be used on Shabbat if it has caught sufficiently to burn on its own. For multiple logs, the flame must ascend independently; for a single log, the fire must take hold of the majority of its thickness and circumference.
More in Hatmanah — Insulating Limits
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