🔍 Key Concepts

• Moisture and condensation inside electrical enclosures • How temperature changes affect air and humidity in sealed or semi‑sealed boxes • Purpose of space/strip heaters in motors and switchgear

💭 Think About

• What happens to the air and humidity inside a motor controller cabinet when it cools down overnight or in a cold, damp environment? • Which problem is more dangerous for insulation and contacts: slightly low temperature, electrical resistance, freezing metal, or water forming inside? • Think about why similar small heaters are often installed in large motors and switchboards—what specific issue are they meant to avoid?

✅ Before You Answer

• Focus on protecting insulation and metal parts from environmental effects, not on improving normal electrical performance. • Ask: Do these heaters usually run when the motor/controller is off and cold, or when it’s operating and already warm? • Verify which option directly addresses water or humidity problems rather than just temperature comfort of components.