When making an eruv for both days of Yom Tov or Shabbat-Yom Tov, must the eruv be physically present at its location during both twilights?
Synopsis
Since Shabbat and Yom Tov are two separate sanctities, each day requires the eruv to be present and accessible at its location during that day's twilight period. Eating the eruv on day one invalidates it for day two.
More in Eruv Tavshilin Procedure
When Yom Tov falls adjacent to Shabbat (or for two days of Yom Tov in the diaspora), can one make two separate eruvei techumin — one for each day — in opposite directions?
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Do the two days of Rosh Hashana differ from other diaspora Yom Tov days regarding eruv techumin?
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When acquiring eruv techumin by foot (bein hashmashot) on the second day of a Shabbat-Yom Tov combination, may one verbally declare the eruv?
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If one made the eruv with bread on day one, may he use different bread for the eruv on day two?
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If one did not make any eruv at all on day one (neither bread nor foot), may he acquire eruv by foot on day two?
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When making a two-day eruv in opposite directions, is it required that each eruv location be reachable on the first day?
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Is Yom Kippur equivalent to Shabbat regarding both eruv techumin and eruv chatzeirot?
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Does Yom Tov observe the laws of eruv techumin but not eruv chatzeirot?
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