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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.

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    ebee: 
     

    Back in the days of yore. Ok then just a few years back. We would all be happy to install using a consumer unit with rewireable fuses. Then a few used High Breaking Capacity fuses and later on we called them High Rupturing Capacity fuses. Then we used MCBs type I II II then they changed to B C D , then we started to add an RCD . wowee. for all of the foregone we were always as happy as a Sandboy called Larry. Now we worry about RCD types A AC F yada yada yadda . 

    Do we feel safer ? Oh lets add SPDs too, No I  am not going any further

    Some of my customers still have hot wire fuses in their fuse boxes, not many, but some.

    Very few still have B.S. 1361 cartridge fuses fitted. Some do though. They were an upgrade years ago, and in some council houses were supposed to prevent the fitting of oversized fuse wire. 

    Then M.C.B.s became popular.

    With Wylex fuse boards all could be fitted in sequence to the same board over time, thus saving labour and materials.

    Now the situation has turned into a big money making circus.

    Wylex Fusebox - Replacing fuses with plug in MCBs is a waste of money - Bing video

    Z.

     

Reply
  • 0

    ebee: 
     

    Back in the days of yore. Ok then just a few years back. We would all be happy to install using a consumer unit with rewireable fuses. Then a few used High Breaking Capacity fuses and later on we called them High Rupturing Capacity fuses. Then we used MCBs type I II II then they changed to B C D , then we started to add an RCD . wowee. for all of the foregone we were always as happy as a Sandboy called Larry. Now we worry about RCD types A AC F yada yada yadda . 

    Do we feel safer ? Oh lets add SPDs too, No I  am not going any further

    Some of my customers still have hot wire fuses in their fuse boxes, not many, but some.

    Very few still have B.S. 1361 cartridge fuses fitted. Some do though. They were an upgrade years ago, and in some council houses were supposed to prevent the fitting of oversized fuse wire. 

    Then M.C.B.s became popular.

    With Wylex fuse boards all could be fitted in sequence to the same board over time, thus saving labour and materials.

    Now the situation has turned into a big money making circus.

    Wylex Fusebox - Replacing fuses with plug in MCBs is a waste of money - Bing video

    Z.

     

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