Oregon Revised Statutes Labor and Employment; Unlawful Discrimination § 663.255

(1) No temporary restraining order shall be issued without notice unless a petition alleges that substantial and irreparable injury to the charging party will be unavoidable. Such a temporary restraining order is effective for no longer than five days and is void at the expiration of that period.

(2) The Employment Relations Board shall not apply for a restraining order under ORS 663.235 if a charge against the employer under ORS 663.120 (2) has been filed and, after the preliminary investigation, the board has reasonable cause to believe that the charge is true and that a complaint should issue.