No. 85-7129. Argued and Submitted December 2, 1985. Decided May 6, 1986. Michael Rubin, A.D. Ward, Ward Keenan, Marsha S. Berzon, Michael Rubin, Altshuler Berzon, San Francisco, Cal., for petitioner. Patrick Szymanski, John Ferguson, N.L.R.B., Washington, D.C., for respondent. Thomas J. Kennedy, Snell Wilmer, Phoenix, Ariz., for intervenor-respondent Arizona Public Service Co. Petition to Review a Decision of the National Labor Relations Board. Before BROWNING, Chief Judge, and SNEED and HUG, Circuit