On Mon, 16 Apr 2018 11:04:01 +0100, charles wrote:

In article , tony sayer

wrote:
In article , charles
scribeth thus
In article , dennis@home
wrote:
On 14/04/2018 13:29, tony sayer wrote:
A nodeMCU will almost certainly do everything you want
including logging to a remote database.

Problem is dealing with mains AC voltages and having to reduce
them first.




Isolating transformers isolate the mains and reduce them to safe
levels.


Care to expand of that statement Dennis?..


What's to explain? they isolate the mains unlike autotransformers or
some other ways to drop mains voltage. You aren't going to get a
sever shock from a 6V isolating transformer like you could from a
potential divider using resistors.

a 6v transformer is just a transformer. Isolating transformers do just
that _ they isolate - mains level voltage on the output. Used to be
an essential workshop item when dealing withn live cahssis equipment.


Indeed they were, still got one 240 in and 240 out at around 5 kW..

Mine's not a big as that, but still quite heavy.

Heavy! I should say so! Based on my collection of 360VA transformers
which each weigh 16 Lbs or so. I'd estimate a 'Ballpark' figure for that
5KVA transformer to be somewhere around a couple of CWT! :-)

--
Johnny B Good