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B and B+ Type R.C.D.s.

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There are so many different types of R.C.D.s available these days. Some are very expensive. I used to like a fully loaded R.C.B.O. consumer unit with A.C. type 30mA R.C.B.O.s. Now it may not be possible to fully comply without spending a lot of cash. And are the newer types of R.C.D. types available as an affordable R.C.B.O. equivilent? Might we revert back to split load consumer units with type A.C. R.C.B.O.s for some circuits and a bank of M.C.B.s on the second half protected by just one type A, F, B or B+ R.C.D? 

 

Quick selection of RCD type
Typical applications Typical loads RCD selection
General applications
(household, commercial, industrial)

Oven, lights Type AC
Dimmer, primary switch mode power supply, multi-speed motors, fan, oven, air conditioning
supplied at 50/60Hz with part of the sinus wave Type A
Extended lighting circuits, computers supply and other lines subject to unwanted tripping Type A-APR
Household appliances and motors with single phase inverters Type F
Industrial applications Motors driven by three-phase inverters Type B
Motors driven by three-phase inverters with very high frequency Type B+

 

Z.

Parents
  • 0

     

    Are these findings in the Valleys where time stands still?

     

    Z.

    I did go down the Rhonda last week, having done four jobs.

    • Down the Rhonda TT upfront 30 mA Type AC RCD, installation just about acceptable, but they did have an electrical fire some time ago, there’s still soot marks on the walls.
    • Coventry TNCS no RCD protection, house needs rewiring no earth on lights with metal switches and fittings, also loads of dodgy DIY work such as a ring spur connected with an exposed strip connector supplying the kitchen, utility and a water feature down the garden.
    • Stoke on Trent TT upfront 30 mA Type AC RCD, installation just about acceptable, but there had not been an earth rod since it was it was rewired around forty years ago.
    • Loughborough TNCS installation generally acceptable, but no RCD protection apart from the shower which has its own consumer unit.
    • Then yesterday in Worcester as an installed TT installation with an upfront ELCB, which is actually as good as the day it was installed because it’s never been messed about with.
    • None of these installations are suitable for the installation of EV charger points or heat pumps, neither should new appliances such as some washing machines be used. Though in the houses without RCD protection there won’t be tripping issues.
    • The general condition of electrical installations in the UK is absolutely disgraceful and they are not fit for purpose anymore, if people want new appliances most of them should be having a considerable amount of work carried out updating or replacing their existing electrical installation, including the installation of the correct RCDs. However it Is not at all unusual to find people have had PV panels installed on the roof and battery storage without the correct RCDs being installed and so on and so forth.
Reply
  • 0

     

    Are these findings in the Valleys where time stands still?

     

    Z.

    I did go down the Rhonda last week, having done four jobs.

    • Down the Rhonda TT upfront 30 mA Type AC RCD, installation just about acceptable, but they did have an electrical fire some time ago, there’s still soot marks on the walls.
    • Coventry TNCS no RCD protection, house needs rewiring no earth on lights with metal switches and fittings, also loads of dodgy DIY work such as a ring spur connected with an exposed strip connector supplying the kitchen, utility and a water feature down the garden.
    • Stoke on Trent TT upfront 30 mA Type AC RCD, installation just about acceptable, but there had not been an earth rod since it was it was rewired around forty years ago.
    • Loughborough TNCS installation generally acceptable, but no RCD protection apart from the shower which has its own consumer unit.
    • Then yesterday in Worcester as an installed TT installation with an upfront ELCB, which is actually as good as the day it was installed because it’s never been messed about with.
    • None of these installations are suitable for the installation of EV charger points or heat pumps, neither should new appliances such as some washing machines be used. Though in the houses without RCD protection there won’t be tripping issues.
    • The general condition of electrical installations in the UK is absolutely disgraceful and they are not fit for purpose anymore, if people want new appliances most of them should be having a considerable amount of work carried out updating or replacing their existing electrical installation, including the installation of the correct RCDs. However it Is not at all unusual to find people have had PV panels installed on the roof and battery storage without the correct RCDs being installed and so on and so forth.
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