ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/18/18 10:41 PM
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
VDE 0100 to introduce AFCIs
by LongRunner. 01/17/18 10:32 AM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 10 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
AC/DC bells #60015
12/20/05 09:38 PM
12/20/05 09:38 PM
P
poorboy  Offline OP
Member
Joined: Jun 2005
Posts: 124
Central Maine
Worked in a housing for elderly project where 24VAC is used for an emergency call system. All of the Edwards bells which are installed are 24 VDC bells. They all work, although a couple that had to be replaced we replaced with DC bells and they didn't work without fiddling around with the gong for tightness. So what's the actual difference between AC and DC bells...are they interchangeble?

Work Gear for Electricians and the Trades
Re: AC/DC bells #60016
12/21/05 07:36 AM
12/21/05 07:36 AM
R
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 856
Titirangi, Akld, New Zealand
Hi, I always understood that a DC bell required an interruptor. eg a switch which breaks the current through the bell coil as soon it pulls in, same like a claxon in a car.

An AC bell has a coil which resonates on the frequency and operates the gong

Although I can't see why a DC bell wouldn't work on AC, as long as the voltage rating is the same, in principle it will work.


The product of rotation, excitation and flux produces electricty.
Re: AC/DC bells #60017
12/21/05 07:40 AM
12/21/05 07:40 AM
R
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 856
Titirangi, Akld, New Zealand
I forgot , An AC bell wouldn't work on DC.
It only will give one kling from the coil pulling in the plunger. also the coil resistance is probably less than for DC.


The product of rotation, excitation and flux produces electricty.
Re: AC/DC bells #60018
12/21/05 12:44 PM
12/21/05 12:44 PM
H
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
I don't know what type Edwards DC bell you are using without looking however it may be similar to the usual doorbell or buzzer also made by them. They all use an interrupter and will work on AC as well as DC as we all know. The fact that you had to do some adjustments to make them work on AC suggests that they are indeed a DC device. Perhaps the other existing bells had a small rectifier wire nutted in the line ahead of them?

-Hal


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 810
Joined: April 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 18
Potseal 14
Popular Topics(Views)
243,546 Are you busy
180,351 Re: Forum
170,832 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.026s Queries: 14 (0.003s) Memory: 0.9578 MB (Peak: 1.0904 MB) Zlib enabled. Server Time: 2018-01-19 09:57:20 UTC