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Discuss Fitting an external tap at a commercial premise in the Commercial and Industrial Plumbing Forum area at PlumbersForums.net

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2,034
Will do but my in house maintenance manager suggests that the attached makes it Class 5 because we would be fitting a hose union tap, what do you think?
My vote is for cat 5 because, for example, someone might decide to stick the hose up a blocked drain in an attempt to clean it. A lower category might be possible but would require a proper risk assessment to justify it.
 

Undertrained

Plumber
Gas Engineer
Messages
365
My vote is for cat 5 because, for example, someone might decide to stick the hose up a blocked drain in an attempt to clean it. A lower category might be possible but would require a proper risk assessment to justify it.
A homeowner might do the same though, and they’re still cat 3.
 

Ric2013

Plumber
Messages
3,132
It's a very weird one actually. Because the tap itself has no backflow potential unless we already know what it is likely to be used for (which we do). Similarly, you could theoretically fit a washing machine valve with 3/4" thread without even a SCV in line (assuming the washing machine IOM states that no backflow protection is required - I always fit a SCV as I doubt any customer will ever bother to check) and then the customer could later connect a garden hose and use it to unblock the kitchen sink (cat 5).

IIRC if the hose union bib tap were internal (rather than external) to a domestic premises and perhaps used to fill a mop bucket, you could quite legally fit it without any backflow protection at all. Then, if a hose were attached, the need for a DCV arises as the hose is a new installation.
 

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