There's really extensive coverage of this in NB-4331 Conformance to Section IX Requirements. It's more than I feel comfortable providing under fair use laws, and more than I feel comfortable with trying to synopsize. If you're supposed to be providing a component to NB standards, hopefully you have purchased a copy of Section III. You can't just weld to Section IX and believe you're ok.
Want to know the do's and don'ts of Eng-Tips? Read FAQ731-376.
English not your native language? Looking for some help in getting your question across to others or understanding their answers? Go to forum1529.