18 CFR 385.406 - Data requests, interrogatories, and requests for production of documents or things (Rule 406).
(1) A request under this section must identify with specificity the information or material sought and will specify a reasonable time within which the matter sought must be furnished.
(3) Each discovery request must be answered separately and fully in writing.
(4) Responses to discovery requests are required to be served only on the participant requesting the information, Commission trial staff, and any other participant that specifically requests service. The presiding officer may direct that a copy of any responses be furnished to the presiding officer. Responses must be served within the time limit specified in the request or otherwise provided by the presiding officer.
(5) If the matter sought is not furnished, the responding participant must provide, in accordance with Rule 410, written explanation of the specific grounds for the failure to furnish it.