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main switch

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  1. cashnotakite

    TT system but no RCD as main switch

    hi, need some help with this one; I'm testing a board that is TT but doesn't have an RCD as main switch, it has a standard 100A switch disconnector (60947-3). However, every circuit in the installation is RCBO protected. Is this ok? Just to make matters a little more awkward the supply cable...
  2. R

    Main switch on Three phase board

    Hi, Changing an old Three phase board in a school today which feed off-peak storage heating and underfloor heating. The supply Is TN-S. The board were fitting in a Crabtree Loadstar, and comes supplied with a three pole isolator. As this is effectivly the main board for the effected...
  3. B

    Burnt neutral wire on 100A main switch...

    Is the most common cause of this problem a loose connection? I came across a burnt out neutral wire on a 100A DP main switch earlier. It was hard to tell if it was loose as it was charred and burnt so bad I couldnt tell! The burnt wire was the 16mm incoming neutral. The establishment is a...
  4. E

    Making off in main switch

    Hi guys, Have to make off some 95mm lugs onto an old Bill main switch, which has 160A fuses. There are 4 terminals with an M10 dome head bolt with a square shank for the 3 phases and neutral, and there are currently 2 lugs on each bolt, 1 feeding a main dis board and 1 feeding a new switch fuse...
  5. C

    wylex main switch rating

    I have just carried out a PIR on a property with an old Wylex 4 way rewireable fuse board - I understand the the main switch isolator on the board is a Bs.5419, but am concerned at the amp rating of the Main switch - I always understood that the small boards were rated a 60amp and the larger...
  6. A

    main switch or circuit breaker

    Hi all Could i have some advice regarding what to put in to the main switch or circuit breaker part of an niceic domestic EIC. I have just started testing and inspecting so sometimes need a bit of guidance. The problem i have got is the 2 way Hager cu provided. The cu is from split 25mm tails...
  7. M

    Main switch rating for new CCU

    I have another CCU replacement to do, but this one is my first one on a 60A service head I am going to do my usual of fitting a cut out switch, but what size tails/main switch RCD should I fit. Its probarbly a stupid question but its for an old boy and I dont want to waste any money unnecessarilly.
  8. B

    No main switch

    Hello I was just trying to test a very old Simplex 3 phase DB which I found in the basement boiler room of a small office block. The door was hanging off... ok I can fix that, there are several holes knocked out of the base of the metal case.... again that shouldn't cause too much trouble, one...
  9. B

    MEMSHIELD D200 MCCB Panelboard and main switch FOR SALE

    Hi, I have a MEMSHIELD D200 MCCB Panelboard and main switch which is surplus to requirements. I have been advised by Eaton/MEM that the unit is now obsolete, aswell as the breakers etc. 2 x MFL203 20A 3 x MFL631 63A 1 x MFL201 20A 1 x MFL401 40A 1 x MFL161 16A 1 x MFL323 32A 1 x MFL633 63A 1 x...
  10. R

    Arcing on neutral at main switch

    Hello all, Been to look at a fault today which consisted of the lighting circuit tripping the mcb. When looking into it further no obvious fault became apparent. When I took a look at the d/b I found some scorch marks and melting of the plastic on the neutral rod from the load side of the main...
  11. J

    Main Switch

    hello, Do you need a main switch in a domestic property if there are 2 boards next to each other being fed from a service block. I was thinking of single point of isolation for the installation but some say if there near each you dont need to. thanks inadvance jimmy
  12. S

    Help !!! Main switch tripping

    Hi Everyone, Sorry if I am being stupid with this ( its late and i'm very tired) Still learning and have had a call from a customer that their main switch (not mcbs) keeps tripping everytime they plug in a hoover, heavy duty drill, microwave, kettle into the socket circuit (all the house...
  13. D

    CU with main switch RCCB

    Hi I am currently training through skills 4 U so only have limited knowledge on electrical requirements. I need help with the following: I have just had my CU periodic test and the guy testing has told me my CU has to be upgraded as it only has 1 RCCB protecting all circuits.This is also the...
  14. I

    Electric Shower on a 63A Main switch CU

    hi guys after a little advice, customer wants an 8.5kw shower fitted to a C.U with a 63a Main Switch. i assume main fuse is 60A. existing circuits Cooker radial 30a mcb, 1 ring main 30a mcb, 1 radial lighting circuit 5 mcb( its a bungalowe ) with diversity applied (quick calculation)...
  15. W

    main switch tripping

    I changed a consumer unit about 4 years ago now and the customer has now come back to me with a problem which happened while they were away. On their return the neighbour who was looking after the house had said that the electric had tripped out. I assumed they meant the rcd had tripped due to...
  16. N

    MK distboard main switch warning !!!!

    I have installed an MK hi integrety CDU fine ok installed and working , but installing an RCBO where the bus bar is slotted into the main out going of the isolator ,what happend was the isolator snapped back on , whilst i was inserting the busbar into position , most isolators switch on and off...
  17. G

    100mA Type S RCD as Main Switch on TT Zs of 188 Ohms wouldn't trip.

    I was testing the above RCD yesterday on my Megger MFT1553 using the Autotest function set to the correct trip range of 100mA but I couldn't get a response from the RCD even at x1. At this point, the meter would simply flash <50V. I then retried the test using the manual functions but still got...
  18. E

    Safe isolation Continuity between live and neutral main switch

    At the board I have isolated the installation, when proving dead my voltage tester is indicating continuity between the live and neutral terminals of the main switch. No voltage just continuity. Switched all mcb's off and on and found when 2 radials are on its indicating continuity! Any reason...
  19. J

    100 Main Switch (consumer unit)

    Hi, sorry for what might seem to be a silly question for many of you. Does the main switch in the ccu offer any protection ( fault or overload)? I understand that some offer RCD protection but do most just act as a simple switch and offer no protection at all just there for simple isolation? Or...
  20. albi

    wylex main switch

    Hi does any know of a BS number for a wylex main switch on a 3036 DB. as I have been puting on my certs wylex main switch as I carnt find any ref for them.?????

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