recently my (triton opal)9kw shower has started tripping the mcb after about 10 mins of use.its run in 6mm about 6meters long and the supply from the mcb does get very warm.suggestions as to why this happening all of a sudden.
remember running at full rated current means a core temp of 70 celcuis
warm therefore would be expected on a cble near its limit.
mcbs of a particular type and value are permitted to have wuite a range of charachteristics and they can change with age especially if overloaded
if its a 32A mcb then provided the cable doesn't run though any thermal insulation you should be able to uprate it to a 40A and this should solve your problem.
remember running at full rated current means a core temp of 70 celcuis
warm therefore would be expected on a cble near its limit.
mcbs of a particular type and value are permitted to have wuite a range of charachteristics and they can change with age especially if overloaded
if its a 32A mcb then provided the cable doesn't run though any thermal insulation you should be able to uprate it to a 40A and this should solve your problem.
Does this shower have thermostatic control? It is winter now, so the water going in will be colder, and you may want it heated more too. So perhaps it IS using more power now. An overloaded mcb will not trip instantly unless it is a big overload. Adding a bit of load might just be enough so it trips now before you finish the shower.
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