This will vary based upon where you live. Most localities require a permit to install and/or turn on your system. This is in place to ensure that your system is installed safely. You should work with your installer to ensure that your system is being installed up to local code. This will vary based upon where you live. Most localities require a permit to install and/or turn on your system. This is in place to ensure that your system is installed safely. You should work with your installer to ensure that your system is being installed up to local code.