rcbo's don't cut the blue cable! | Electricians Forum wwwtriciansforums›ForumsJan 01, 2009Discuss rcbo's don't cut the blue cable! in the Electrical Wiring, Theories and Regulations area at ElectrciansForums. I was on a job last year,big multiroomed hotel,each with their own consumer unit which entailed the installation of at least 2 rcbo's per unit of my jobs was to go round Fitting an RCBO in a consumer unit - John Ward RCBOs are a single device which combines a circuit breaker and RCD. As they must sense the current in both the line and neutral, they have connections for both. This example has a flying lead for the incoming neutral connection and a standard terminal for the line busbar. A smaller white lead is [PDF] TECHNICAL DATA & DIMENSIONS - TLC-Direct Wylex MCBs are of the thermal-magnetic current limiting type, having MCB & RCBO – Technical Data BACK-UP PROTECTION Tripping current designated by the IEE Wiring Regulations to provide additional protection against direct contact shock, ie socket outside Installing a Consumer Unit | Instructions on Wiring a Advice on installing a consumer unit. Instructions on wiring a consumer unit to UK specifications for dual RCD and RCBO consumer units. Here is a detailed explanation of the consumer unit and how it should be installed in the UK.