View the thread, titled "dc-ac/dc" which is posted in Periodic Inspection Reporting & Certification on Electricians Forums.

D

devlin maguire

Hi After reading another post about IR tests a thought occurred to me that I cannot answer, some of the more technically gifted wil,l I am sure know, anyway if you apply dc voltage to a ac to dc transformer what happens? anyone !!
Mac
 
Well if so that would confirm the opinion held by me and others regarding the 250v or 500v ir tests without confirming whats on the circuit, someone said use the 250v test first to see if there is something connected and, if BooM is indeed the result of dc entering a ac/dc tranny then we all best beware, any way joking aside I think I have an old coka cola font light tranny kicking around might stick it onto a dc test and see if it melts
MAc
 
By transformer I take it you mean a power supply containing a transformer followed by a rectifier circuit to generate the DC. In this case, applying DC to the input will have bugger all effect as nothing will be produced at the secondary side of the transformer. However, unless you can disconnect the transformer you will read a resistance through the primary winding so it will be a case of linking the lives and IR testing them to earth. 250v will certainly be no problem. 500v...hmmm, not sure, depends on the insulation classification of the transformer winding. Probably best not risk it.
 
JC Dc Cheers that was very informative there is lots of things like that I would love to investigate but right now Iam without a workshop to play in
Mac
 

Reply to the thread, titled "dc-ac/dc" which is posted in Periodic Inspection Reporting & Certification on Electricians Forums.

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Advert

YOUR Unread Posts

Daily, weekly or monthly email

Thread Information

Title
dc-ac/dc
Prefix
N/A
Forum
Periodic Inspection Reporting & Certification
Start date
Last reply date
Replies
4

Thread Tags

Advert

Thread statistics

Created
devlin maguire,
Last reply from
devlin maguire,
Replies
4
Views
1,060

Advert

Back
Top