Replacement transformer
 

Don Pearce wrote:

Anyone who thinks the USA joined WWII to help us out is seriously
misreading history (and a well-developed sense of USA self-interest).
And of course you do get a rather lop-sided view of warfare when you
only ever experience war in foreign countries.

American industry did wonderfully out of it, esp not having to worry about air
raids. Despite all of which the RAF dropped a far greater percentage of tonnage of
bombs in Europe than the USAAC/USAAF.

Graham

Replacement transformer
 

Ian Jackson wrote:

So 240V is 'normal'.

Try telling Chinese manufacturers of cheap wall warts that ! I had one that would
audibly buzz around 250V.

Graham

Replacement transformer
 

"Eeysore"

"Dave Plowman (News)" wrote:


Two core extension leads are available from any shed. Designed for use
with suitable appliances.

As Phyllis often says, called double-insulated or 'Class II'.


** No such animal is legally allowed on sale.

Cos it would de-earth a normal ( ie all earthed) appliance.

Leads using 2 pin IEC sockets at one end are not " extension leads " - cos
they are adaptor leads.



........ Phil

Replacement transformer
 

"Dave Plowman (News)" wrote:

Eeyore wrote:
You don't see any connection between the grounding and protection
arrangements in a domestic installation and the design requirements for
any appliances used therein?

You don't have the FAINTEST clue what you're talking about.

Crikey. And I thought you knew something about it.

Totally different standards.

Graham

Replacement transformer
 

"Dave Plowman (News)" wrote:

In article ,
Eiron wrote:
What makes you say that when my mains voltage is right in the middle of
the specification for European mains (220-240V). ISTR you said you were
getting 240V+?

The UK spec is 240v. If you have 232v you have a problem.
The 'European Mains' spec is a hack allowing individual countries
to keep their own voltages while remaining in tolerance.
And at some time in the future, when most of the installed equipment
has been replaced by new stuff designed to accept 220 to 240v, it's
possible that the UK will drop its voltage to 230.

The UK spec is *not* 240v.

It is 230 +10/-6% Same as much of Europe.

In all the EU. 27 countries now.


That allows a range of 216 - 253v

The old spec was 240v +/- 6%

A range of 226 - 254v

And in many parts of Europe it was 220V +/- 6% which is why I still test to
207V for regulator 'drop-out'.

Graham

Replacement transformer
 

"David Looser"


OK, it's been a long thread and it's hard to keep track of who said what
about what to who. Suffice it to say here that there is no law I know of
that says that you can't replace a class 2 wall wart with a class 1 power
supply.


** Except the laws of physics.

Safety grounding one side of a 12 volt DC or AC adaptor's output will cause
MAJOR damage with the majority of audio devices that use such supplies.

It is usually essential the output be "floating" for the circuitry inside
the box to work.



....... Phil

Replacement transformer
 

"Eeysore = Lying Bull **** Artist" "


The stuff I design operates from 208-253V equally well.


** Huh ??

There is a 48 % variation in the output power of an amplifier over that
range.




....... Phil

Replacement transformer
 

David Looser wrote:

"Eeyore" wrote
David Looser wrote:

So who mentioned class 2?

You don't need to mention it. A plastic ground pin (as typical) for a wall
wart ensures it must be.

OK, it's been a long thread and it's hard to keep track of who said what
about what to who. Suffice it to say here that there is no law I know of
that says that you can't replace a class 2 wall wart with a class 1 power
supply.

Can't think of a Law that would stop you but might cause earth loopy probs.

Graham

Replacement transformer
 

Eiron wrote:

Dave Plowman (News) wrote:
Eiron wrote:
What makes you say that when my mains voltage is right in the middle of
the specification for European mains (220-240V). ISTR you said you were
getting 240V+?

The UK spec is 240v. If you have 232v you have a problem.
The 'European Mains' spec is a hack allowing individual countries
to keep their own voltages while remaining in tolerance.
And at some time in the future, when most of the installed equipment
has been replaced by new stuff designed to accept 220 to 240v, it's
possible that the UK will drop its voltage to 230.

The UK spec is *not* 240v.

It is 230 +10/-6% Same as much of Europe.

That allows a range of 216 - 253v

The old spec was 240v +/- 6%

A range of 226 - 254v

Can you come up with evidence that any UK electricity supplier has changed
from a target of 240v to 230v? Any supermarket selling 230v filament lamps?
Anyone reported low voltage to the supplier and had it 'fixed' at 230v?
I expect it will happen, but it doesn't seem that it has yet.

No experience of that myself but apparently the ever diligent Germans have been
upping the voltage to 230V in some places, also the Dutch IIRC.

OK, some numbers

Quartz Halogen 100W bulb 240-250V
GLS 100W bulb 240V
Philips 18W CFL 230-240V
Osram 20W CFL 220-240V

Actual line voltage now 245.0V

Not much help really !

Graham

Replacement transformer
 

tony sayer wrote:

Eiron scribeth thus
Dave Plowman (News) wrote:

The UK spec is *not* 240v.

It is 230 +10/-6% Same as much of Europe.

That allows a range of 216 - 253v

The old spec was 240v +/- 6%

A range of 226 - 254v

Can you come up with evidence that any UK electricity supplier has changed
from a target of 240v to 230v? Any supermarket selling 230v filament lamps?
Anyone reported low voltage to the supplier and had it 'fixed' at 230v?
I expect it will happen, but it doesn't seem that it has yet.

Its been like it for some time. All part of European Harmonisation.

To cope with the old 240 volts here and 220 over there.

And yes we've had less then 226 volts at one site, it went down to 205
volts and after some pestering they did fix it at great expense to the
distribution co..

It wasn't that long ago we had 200 volts DC he))..

I've seen as low as 195V in an old factory. Mind you the phases were horribly
unbalanced until I took the cover off the distribution board and did some live
swapping of loads to phases ! The MD walked in and nearly had a fit. Strangely
for him he was concerned about my safety. ;~)

Graham