Rubber Cable in Sauna Applications: How H07RN‑F Handles High Heat and High Humidity
A Finnish sauna equipment manufacturer’s 2022 after‑sales data revealed a pattern: returned “faulty heaters” often tested fine at the factory. The actual problem was the connecting cables. After several years in service, many power cables showed sheath cracking at the wall penetration point, with insulation resistance dropped enough to cause intermittent tripping. The common factor: […]