Very near the taberncale where the blessed sacrament ( body of Christ is kept)
The Sanctuary lamp, when burning, lets us know that Our Lord Jesus Christ is present in the Tabernacle.
Churches have sanctuary lamps because it represents the presence of god.
Sanctuary lamps actually date back to ancient Jewish times and the custom followed into the early Christian Church. God ordered that an oil lamp be kept burning constantly before the Jewish...
A Sanctuary Lamp must be lit anytime the Blessed Sacrament if reserved in a Church.