UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Other Discussions > Homebrew Equipment

Notices

Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members.

Closed Thread
 
Thread Tools
Old 2nd Mar 2021, 10:25 pm   #1
tritone
Banned
 
Join Date: Nov 2014
Location: Derry, Northern Ireland, UK.
Posts: 167
Default Isolation TFRMR console construct project

Dear forum,

I have built an isolation transformer unit for my little workbench and this is the way I have done it.
Any thing is change-able, but I think I have constructed it to best of my knowledge.

I just wish to ask any of you to please proof read and give me any corrections or changes that I may need to do for legal, safety and logical reasons.

Please see the attatched PDF file that I have drawn up.

Thank you all in advance.

Greg.
Attached Files
File Type: pdf Isolation transformer (2018_10_.pdf (19.0 KB, 167 views)
tritone is offline  
Old 3rd Mar 2021, 7:26 pm   #2
buggies
Heptode
 
buggies's Avatar
 
Join Date: Jan 2009
Location: West Lothian, UK.
Posts: 760
Default Re: Isolation TFRMR console construct project

I am not an electrician so not qualified to make any comments on safety etc.

Just a couple of random thoughts.
My variac has a metal case and I would feel uncomfortable powering it from your output socket (in isolated mode). I would perhaps provide a special 13A socket with isolated mains but a permanent earth connect solely for the variac.

I would probably not have a switch in the earth line - too easy to leave in the wrong position - but can't decide on a more foolproof method. Maybe a big red neon which glows if earth is on the output would help?
__________________
George
buggies is offline  
Old 3rd Mar 2021, 9:23 pm   #3
Guest
Guest
 
Posts: n/a
Default Re: Isolation TFRMR console construct project

Perhaps the earth connexion should be a momentary switch so it can be used for testing but not left in a possibly dangerous state. We all have different ideas abut safety, I am happy "lifting earths" form 'scopes etc. for example.
 
Old 3rd Mar 2021, 9:31 pm   #4
ms660
Dekatron
 
ms660's Avatar
 
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
Default Re: Isolation TFRMR console construct project

Scroll down to diagrams:

http://switchdiagram.blogspot.com/20...ansformer.html

Lawrence.
ms660 is offline  
Old 4th Mar 2021, 6:41 pm   #5
tritone
Banned
 
Join Date: Nov 2014
Location: Derry, Northern Ireland, UK.
Posts: 167
Default Re: Isolation TFRMR console construct project

Thanks fellas, all good advice from you.

@buggies, yea, good idea, a big red neon is on the way for the output earth. Nice one.

Cheers.
tritone is offline  
Old 26th Mar 2021, 4:33 pm   #6
tritone
Banned
 
Join Date: Nov 2014
Location: Derry, Northern Ireland, UK.
Posts: 167
Default Re: Isolation TFRMR console construct project

Dear forum,

With all of your tips, tricks, knowledgen, advice & experience, I have re-drawn the schem and ordered the things I need to move forward.

Please take a look at the revised PDF schematic and give me some corrections where you can identify them.

Many thank you's.
Attached Files
File Type: pdf Isolation transformer (2018_10_.pdf (18.5 KB, 57 views)
tritone is offline  
Old 26th Mar 2021, 5:31 pm   #7
Guest
Guest
 
Posts: n/a
Default Re: Isolation TFRMR console construct project

I have been thinking about making an isolation transformer unit for my workshop. To save all the "earth the earth pin (UK 13A BS1363 etc.) or not" stuff I think I will make it have two pin BS1363 output connector using the MK style shutters that only need the L+N pins to work, so I can plug in a 13A plug either way round (not that it would make any difference) but I would know it is the isolated output. The earth pin would then be floating and accessible for measurement.

Time for a socket, hacksaw and car body filler to make a prototype I think.
 
Old 26th Mar 2021, 5:57 pm   #8
space charge
Tetrode
 
space charge's Avatar
 
Join Date: May 2013
Location: Enniscorthy, County Wexford, Ireland.
Posts: 74
Default Re: Isolation TFRMR console construct project

its not really isolated if the earth is brought forward is it ei7ka
space charge is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 3:37 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.