The answer to 'outlet installation making buzzing noise' is that a buzzing outlet is usually caused by a loose or faulty electrical connection. This can be due to improper wiring during the installation, a loose outlet, or other electrical issues. The buzzing sound is often a sign of an unsafe condition that needs to be addressed promptly.
In most cases, a buzzing outlet should not be ignored as it can indicate a serious electrical problem. It's best to have a licensed electrician investigate the issue and make any necessary repairs. Attempting to fix a buzzing outlet yourself can be dangerous if you don't have the proper training and equipment. Calling a professional is the safest option to ensure the issue is resolved correctly and your home's electrical system is safe.