It will depend on the type of agreement. For the standard written agreement, it will be six years in New Jersey.
Same as all other plumbing in civilized countries
Not necessarily, depends what and where plumbing work is to be done. Check with local plumbing authority about needing license or not. Sometimes you need license to pull permits to do plumbing work. Plumbers usually have at least a journeyman's license.
The only plumbing work that you are allowed to perform without a license is for your own property.
yes
6 months
Commercial plumbing is a service offered primarily to businesses. Many plumbers do work for householders but these would not usually be seen as offering commercial plumbing. A commercial plumbing firm might for example be employed by a builder to do the plumbing in all the houses on a new housing estate.
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Normally union journeymen plumbers
To have correct evidence to his work .And to prove his work and aim of his work;
You can find information on pursuing a plumbing career at http://www.streetdirectory.com/etoday/the-different-possible-routes-to-pursue-a-plumbing-career-wpufou.html. Another great site is http://www.toiletology.com/Plumbing_career.shtml.
your limitations
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