# Lighting Dimmer Switches ### Issue Image: ## Issue Description: - Throughout Australia, the Electrical Supply Authority sends a signal via the power line of either 750Hz or 1050Hz in most areas; or 492Hz in a few regional areas. Ripple control has existed for many years and is used for controlling demand and implementing different customer tariffs; for example, switching a site between its on-peak and off-peak meter in the days before smart meters. ## Issue Explanation: Many electrical devices including toasters, fridges, fans, fluorescent, halogen, and LED lighting can be sensitive to these frequencies. This may lead to buzzing sounds or other side effects from affected devices. In the case of LED lights, there can be a perceptible flicker, especially if its connected to a dimming device or driver. In the case of LED lights the flickering will generally occur at 7am in the morning and 10pm in the evening. Some people are bothered by it, some aren't. In the past we have tried many of the recommended fixes, including different combinations of dimmers, signal filters and different lights. None of these are able to completely stop the effect. For this reason, we do not provide Dimmer Switches to customers, if they want to install these later, they can do this easily. ## Actions to Prevent this Issue: - [ ] Don't provide dimmers to the customers if they want to install these later, they can do this, this way we won't be responsible for trying to fix something which is impossible to do! ## Source [Ripple Signal](https://www.melec.com.au/news/supply-authority-ripple-frequency-flickering-led-lights/)