Why your CCTV fails in Durban humidity, salt air and storms
Durban is hard on outdoor electronics. Humid summers, salt air on the coast, strong sun and summer lightning all shorten the life of a camera system. This guide explains each cause and how to prevent it.
Durban's climate in one paragraph
Durban is humid and subtropical. Summer, roughly October to March, is the wet season, with frequent afternoon thunderstorms and lightning, especially inland and on the higher ground of the Highway area. Along the coast, from uMhlanga and La Lucia down to the Bluff and Amanzimtoti, the air carries salt. The sun is strong all year. Each of these attacks a CCTV system in a different way.
Moisture in connectors and junction boxes
The most common outdoor failure is water getting into a cable joint. Humid air condenses inside poorly sealed boxes, rain runs down a cable into the back of a camera, and connectors begin to corrode. The signs are cameras that flicker, drop out in wet weather and come back when it dries, or a picture with lines across it.
- Use sealed, outdoor-rated junction boxes for every joint.
- Leave a drip loop in every cable so water runs off before it reaches the camera.
- Seal cable entry points into walls and boxes.
- Avoid joints in exposed places where possible.
Salt air on the coast
Salt speeds up corrosion. On the coast, ordinary steel brackets and screws rust, leaving stains down the wall and eventually letting go. Camera housings pit, domes cloud and connectors turn green. Systems near the beach can show these problems within a few seasons. Coastal-grade or stainless fixings, good seals and regular cleaning slow it down. See our pages for the Bluff and Amanzimtoti for local examples.
Lightning and surges
A lightning strike does not have to hit the house to damage the system. A strike nearby can send a surge along power lines, outdoor camera cables or the telephone and fibre line, and damage the power supply, cameras on long runs, the recorder's network ports and the router, all at once. This is common after summer storms on the Highway, in Hillcrest, Kloof and Gillitts.
- Surge protection on the mains supply to the CCTV.
- Surge protection on long outdoor cable runs, where the installer recommends it.
- Correct earthing of the system.
- Fibre for very long runs, which does not conduct surges.
Sun, heat and UV
Strong sun breaks down ordinary plastic cable sheathing and camera housings over time, making them brittle and cracked. Heat also shortens the life of recorders and backup batteries kept in hot garages or roof spaces. Use UV-resistant outdoor cable or conduit, and put the recorder and UPS somewhere cool and ventilated.
Insects, spiders and plants
Durban's insects love the warmth and infrared light of a camera at night. Spider webs across the lens are one of the most common causes of blurry night pictures and false motion alerts. Fast-growing plants block views within months. Regular cleaning and trimming, and good placement away from foliage, help.
Where you put the recorder matters
The recorder is the heart of the system, and it is often tucked away in the worst possible place: a hot roof space, a damp outside cupboard or a garage that bakes in summer. Heat and damp shorten the life of its hard drive and power supply. A shelf in a cool, dry, ventilated room inside the house, close to the router and to a backed-up power point, is a much kinder home. If the recorder must go somewhere warm, ask the installer about ventilation.
Signs your system needs attention
- Cameras that drop out in rain and recover when dry.
- Foggy, washed-out or spotty night pictures.
- Rust stains below brackets.
- Several parts failing at once after a storm.
- The recorder restarting or beeping, or gaps in playback.
Prevention and repair
Most of these problems are cheaper to prevent than to repair. A yearly check that cleans lenses and domes, opens and inspects outdoor joints, checks brackets and tests the backup battery catches faults early. See CCTV maintenance. If a fault has already appeared, start with CCTV repair, and if parts are badly corroded or storm-damaged, an upgrade may be better value.
Frequently asked questions
Why does my camera fail only when it rains?
Usually water is getting into a connector or junction box. The joint needs to be dried, any corroded parts replaced and the joint properly sealed.
How often should a coastal system be checked?
Many installers suggest at least once a year on the coast. Ask yours what they recommend.
Can lightning damage cameras even if it does not hit my house?
Yes. A nearby strike can send a surge along cables. Surge protection and earthing reduce the risk.