By “sit in,” do you mean serve as a member of? The general answer is that a JHSC must have a minimum number of both management and worker members. The latter must work at the site of the JHSC and be elected as members. There may be restrictions on which workers can serve as worker representatives, especially in a union workplace, depending on the jurisdiction. If you tell me which jurisdiction you’re in, I can look up the worker member eligibility rules that apply.
If by “sit in” you mean attend a JHSC meeting, then, yes, any worker may attend the meeting unless the particular JHSC has a bylaw restricting attendance, in which case the bylaw restrictions apply.
Hope that answers your question. I’ll be happy to follow up if you tell me which jurisdiction you’re in or have further questions.
Glenn Demby, OHS Insider Editor-in-Chief