The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Safety at heights?
by HotLine1
Yesterday at 08:51 PM
International Wire Colour Codes
by Texas_Ranger
Yesterday at 03:29 PM
Looking for older post
by Texas_Ranger
Yesterday at 03:22 PM
Last time to chat here
by Trumpy
01/20/17 11:41 PM
Unsafe Situations
by Trumpy
01/20/17 09:46 PM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
Admin 35
HotLine1 21
Ruben Rocha 17
gfretwell 16
Trumpy 15
Who's Online
1 registered (Admin), 67 Guests and 11 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#167570 - 08/15/07 01:49 PM need help got a question?
JourneymanAndy Offline
New Member

Registered: 08/15/07
Posts: 1
Loc: MA
if you got a 24 volt dc transformer and you switch the polarity would you still have 24 volts or would it be 0?

Top
#167571 - 08/15/07 02:36 PM Re: need help got a question? [Re: JourneymanAndy]
Radar Offline
Member

Registered: 04/30/04
Posts: 349
Loc: Los Angeles, CA
Quote:
24 volt dc transformer

One problem here is that transformers won't work on ordinary DC, meaning a DC voltage applied to the primary winding. (We're discounting a pulsating DC for sake of simplicity).

Your question needs to be clarified a bit. If you mean a transformer/rectifier unit that has an AC voltage applied at the primary (input) and outputs 24V DC, then in theory reversing the AC input leads should make no difference in the output voltage.

One qualifier here - in practicle applications, the AC side (Primary) may be made with one lead intended to be the "hot" on a 120V system and the other lead intended to be the "neutral". This has no affect the actual circuit operation - but will affect safety, etc.
_________________________
There are 10 types of people. Those who know binary, and those who don't.

Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals