There are two authorized requirements you will want to realize before you can begin working; first, you should cross your ACS gas qualification and second, you have to be on the Gas Safe register. https://xljj4qzxvkjkqyrc6nfonhwrly6jod22vvzwyhbudpi77lrhexwa.cdn.ampproject.org/c/s/Atavi.com%2F%3A443%2Fpukiwiki-1.4.7_notb%2Findex.php%3Fpantryfly24/