My predecessor for the activity "Prepare RFQ (Request for Quotation) of Equipment xxx" in mechanical engineering is the activity "Prepare Data Sheet of Equipment xxx" in process engineering. Basically all my RFQ preparation activities for mechanical equipments have the same type of predecessor (linked to the corresponding Data Sheet in process).
I'd like to know the same for the electrical equipment. Which would be the best predecessor for the activity in which the electrical engineers start preparing the information to go for RFQ of those equipments? Preliminary Electrical Equipment List? Preliminary Electrical Line List?
Also, what would be the best predecessor for materials in this case? (cables, cable trays, etc.) The MTO (Materials Take-Off) deliverable?