01
Two components
- 1Walls or tzurat ha-petach - make the area private
- 2Shared bread - joins residents into one domain
- 3Blessing: "al mitzvat eruv" and the declaration
- 4Renting rights from a non-Jewish resident
Source: Tractate Eruvin and SA (OC 366). Eruv chatzerot is an enactment of King Solomon (Eruvin כ״א ע״ב (21b)).