Does NFPA 51B apply to the work that is going to be performed? That is the main question to ask yourself before applying the requirements in the Standard.
NFPA 51B does not apply to candles, pyrotechnics, cooking operations, or additional requirements for hot work operations in confined spaces. Take a look at this clip to find out what it does cover.
This information can be found in paragraphs 1.3.1 and 1.3.2 of NFPA 51B (2014), which can be viewed for free here.
I'll be posting more videos on hot work safety throughout the week so be sure to check back!