Troidal tranny blowing breakerWe

[Lillpete]

I recently replaced a 300watt troidal tranny for a client, all was well but now he has contacted me saying that now when he turns both kitchen light switches on together (the tranny is on one of these) the circuit breaker blows, not turning them both doesn't appear to be an option. I guess thestarting load of the new tranny is higher than the old one is there anything I can do to reduce this starting load eg fit a capacitor in the circuit or something, I'm not sure if thereia

rer

 

[Lurch]

Somewhat erratic ending!

Anyway, this is the problem with toroidal transformers, and why I haven;t fitted one in the last 11 years. You could up the MCB to a C6 or C10, if the circuit will allow it. You could change to a different make of transformer, or swap it for an electronic one. The first and last options would be my choices, in reverse order.

 

[batty]

They can do that had to replace a mcb from b6 to c6 when a John Lewis fitting had been installed and that was a smaller transformer than the one you fitted. As long as you check loop and its not above max you will be ok.

 

[Evans Electric]

What he says , type C MCB ,soft start tranny or if desperate , feed a 1way C/U from, say, a 20A way ,fit a 6A HRC fuse in the 1way . Nothing wrong with HRCs and it will carry the start up surge.

Sighnig off before flak starts to fly.

Deke

 

[Lurch]

feed a 1way C/U from, say, a 20A way ,fit a 6A HRC fuse in the 1way . Nothing wrong with HRCs and it will carry the start up surge.

Sounds like a longwinded way of just swapping the MCB for an HRC!

 

[batty]

What he says , type C MCB ,soft start tranny or if desperate , feed a 1way C/U from, say, a 20A way ,fit a 6A HRC fuse in the 1way . Nothing wrong with HRCs and it will carry the start up surge. Sighnig off before flak starts to fly.

Deke

Go on then go you keep saying your going just go.

 

[Lillpete]

Oops my 2 year old son finished and sent the post for me ]b thanks for all your replies I'll have to pop back through the week and check out ccu and see what cb's are available

 

[Evans Electric]

Sounds like a longwinded way of just swapping the MCB for an HRC!

Because many brands of MCB do not make a HRC fuse unit as straight swop, Hager do but others don't.

 

[mikep]

I use the TLC 250watt Electronic transformers all the time, Nice soft start and I get for only

 

[Lillpete]

The ccu is an old wylex one I think it was the NB range, any idea if/where I can get a type C 6a breaker for this??

 

[batty]

The ccu is an old wylex one I think it was the NB range, any idea if/where I can get a type C 6a breaker for this??

I would think that would be a type 3 but could be wrong about that. I know that proteus do one that fits but not sure if they do a c type try cef. nb boards are old hat now and you will struggle to get a suitable breaker to fit although I do have loads of 10 amp second hand ones I may even have a type 3 one some where will have a look tomorrow.

 

[Lillpete]

I would think that would be a type 3 but could be wrong about that. I know that proteus do one that fits but not sure if they do a c type try cef. nb boards are old hat now and you will struggle to get a suitable breaker to fit although I do have loads of 10 amp second hand ones I may even have a type 3 one some where will have a look tomorrow.

you might be right re. Type 3, if you do have anything suitable that wouldbe great

Thanks

 

[batty]

you might be right re. Type 3, if you do have anything suitable that wouldbe greatThanks

Sorry had late evening will have a look tomorrow.

 

[Lillpete]

Apparently proteus M6's will fit but tried CEF and they now only do type 2's

 

[batty]

Apparently proteus M6's will fit but tried CEF and they now only do type 2's

The one I have is a 30 amp so no use. The only way you could get over not doing board change would be put bigger breaker in and then spur with 5 amp fuse in above board but personally I think board change will be best long term option.

 

[Lillpete]

I haven't had a chance to look at my regs book, can anyone confirm if a bs1362 or whatever they are ie normal fused spur fuses can take a larger start up?? If so then I guess that's the way to go ( thanks for the tip)

 

[batty]

I haven't had a chance to look at my regs book, can anyone confirm if a bs1362 or whatever they are ie normal fused spur fuses can take a larger start up?? If so then I guess that's the way to go ( thanks for the tip)

Any cartridge fuse will not be affected by start up currents.