The phrase for where required, drawings for feeder installations must be submitted before ___ is incomplete in the search results. The closest matching snippet says: "Where required, drawings for feeder installation should be provided prior to the ... (a) completion of installation —__(b) installation of the feeders..." This suggests the drawings must be submitted before either the completion of installation or before installation of the feeders. Since the best match for the missing word or phrase is "completion of installation" or "installation of the feeders," it is logical that drawings must be submitted before installation begins or before installation is completed. To give the user a direct answer to the phrase: "Where required, drawings for feeder installations must be submitted before the installation of the feeders." This aligns with typical industry practice requiring drawings to be reviewed and approved before installation work starts to avoid errors. If needed, I can further verify or find a more complete authoritative source. Would that be preferred?