If an MCB/Fuse which protects the electrical circuit to a shower persistently trips/disconnects the circuit then this is often referred to as “nuisance tripping.”
Nuisance tripping usually occurs for 2 main reasons:
The first is that the MCB/Fuse may be undersized. In this case, the IOM’s to the product should be consulted to ensure that the MCB/Fuse size is appropriately sized for the KW rating of the shower. In the event that the MCB/Fuse installed is rated smaller than the IOM recommends then this would explain the reason for the nuisance tripping as the circuit is operating at a higher current than the MCB/Fuse is rated to and is therefore operating the protective device.
In some circumstances the MCB/fuse may be undersized but may have operated in this condition for some time without tripping but may suddenly start to trip due to being operated in overload conditions for extended periods.
In these circumstances the customer should consult with a suitably qualified electrically competent person.
(WE DO NOT ADVISE THE REPLACEMENT OF PROTECTIVE ELECTRICAL DEVICES WITHOUT CONSULTING AN APPROPRIATELY QUALIFIED PROFESSIONAL.)
The second reason that an MCB/Fuse may persistently operate is because as fuses age they become worn and get more sensitive to the circuit load. As the load suddenly increases, or if a heavy load item is operated, then a trip can occur.
In these circumstances the customer should consult with a suitably qualified electrically competent person.
(WE DO NOT ADVISE THE REPLACEMENT OF PROTECTIVE ELECTRICAL DEVICES WITHOUT CONSULTING AN APPROPRIATELY QUALIFIED PROFESSIONAL.)
