Schoellkopf, R.S. Electric freeze protection and process heating / by R.S. Schoellkopf. - Palo Alto, Calif. : Electric Power Research Institute, 1987. - 12-61 p. - Power Plant Electrical Reference Series. . Includes bibliographical reference and index. ISBN: 0803350112 Subjects--Topical Terms: Design (systems).Heat tracing.Controllers.Installation.Testing.Maintenance.