Overheated RCBO terminals could cause a fire

Burnt out RCBO

Our “fault of the week” blog posts are all real electrical fault situations that have been reported by Veriserv engineers whilst carrying out Inspection & Testing of electrical installations at client sites. This fault is an RCBO (residual current breaker with overcurrent) that has become overheated and burnt.

This C1 electrical defect is a result of a loose connection causing arcing at the RCBO terminal. Not only would this lead to a failure in the RCBO and electrical circuit, there would also be a serious threat of fire should the melted plastic ignite in some way.

The Veriserv engineer would immediately isolate this circuit and report the defect to the client on what we call an “immediate report”. This so the client is aware of any defects prior to the engineer leaving site. The RCBO and adjoining cable would be replaced if the client requested that Veriserv carry out the remedial repair.

Overheated RCBO terminals could cause a fire, this fault would be classed as a C1 Fail Code -Danger Present. Risk of injury. Immediate remedial action required.

The Electricity at Work Regulations 1989-Reg 4(2) state “The need for maintenance to be done to ensure safety”.  As such all commercial premises must be electrically tested and certified to ensure they can continue to be used safety.

BS7671 wiring regulations to the latest edition sets out the requirements for all electrical installations in the UK. The Institute of Engineers and Technology (IET) produce guidance notes to enlarge on the wiring regulations and set out guidance on how compliance can be achieved. Guidance Note 3 covers the Inspection & testing of Electrical Installations.

An electrical installation should be periodically inspected by a qualified electrical engineer. Veriserv are experts in this field and will advise any customer who may be unsure of the periodicity or scope of the Inspection & Test. Veriserv will issue an electrical certificate and report to their customer with a statement as to the condition of the electrical installation. Click here for more details.