Recent Topics
Corrosion in the garage - salt or humidity?
by Kurtatron
14 minutes 34 seconds ago
Darn dogs
by AZjeff
Today at 10:21 PM
New GC?
by Bullwinkle007
Today at 10:04 PM
The guy with the plexiglass head on you tube
by andyd
Today at 09:21 PM
'07 Pacifica Timing Belt Replacement success
by 92saturnsl2
Today at 09:10 PM
SAE 90 v 85/140
by Knuckle078
Today at 09:10 PM
Mobil 1 5W30-HM 5,011 mi, 1999 Ford Escort
by WA1DH
Today at 08:45 PM
what happened to merk
by ernied
Today at 08:34 PM
Schaeffer's oil reviews on Amazon
by zfasts03
Today at 07:41 PM
Decent MP3 player
by Ed_T
Today at 07:08 PM
Letgo
by Donald
Today at 06:52 PM
Tire buying advice
by supton
Today at 06:23 PM
Two versions of M1 5w30 ESP now?
by Patman
Today at 06:21 PM
No older cars in New York State?
by Oldtom
Today at 06:19 PM
2009 Taurus strut mount noise
by terry274
Today at 04:38 PM
A3/B3 vs A3/B4, big difference or irrelevant?
by FordCapriDriver
Today at 03:36 PM
2003 Honda power steering problem
by hogpops
Today at 03:29 PM
Public Service Announcement: Flush Your HW Heater
by gathermewool
Today at 03:25 PM
Fellow 2AZ-FE toyota owners: what oil are you usin
by car51
Today at 03:21 PM
Castrol 0W40 vs 5W40??
by Realfine69
Today at 03:02 PM
Newest Members
lozpxs, danthemanx07, FunktasticLucky, Knuckle078, penncove
65317 Registered Users
Who's Online
70 registered (154cm, 77GrandPrix, 1JZ_E46, 2015_PSD, 4WD, Aero540T, 8 invisible), 1153 Guests and 56 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65317 Members
67 Forums
285949 Topics
4771852 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4640960 - 01/20/18 12:52 PM Doorbell repair? Transformer not grounded?
Reddy45 Offline


Registered: 08/15/08
Posts: 2973
Loc: USA
Anyone ever replace their doorbell?

Turns out mine has been dead for.. I guess a year now, but it's not like I would know since I never ring my own door bell. LOL

(I wonder how many people I missed because of this?)


The mains wiring to the transformer had 120V, but the transformer itself produced no voltage (should be around 16V).

I pulled the chime and the transformer off the wall, and one of the "plungers" that makes the noise was flat out MELTED. We had some bad storms about a year ago where the power cut on/off about a dozen times in a 5 minute period, so this probably did it.

Anyway it's weird -- the transformer has 3 wires (black, white, green) but the green wire was snipped off so that it couldn't be connected to the ground wire. (the junction box this was in has a bare copper ground) The builder of the home must have done this. But why? Wouldn't grounding the transformer have kept it from dying during a power surge?


Top
#4640971 - 01/20/18 01:01 PM Re: Doorbell repair? Transformer not grounded? [Re: Reddy45]
Warstud Offline


Registered: 09/02/05
Posts: 5414
Loc: MIchigan
Originally Posted By: Reddy45
Wouldn't grounding the transformer have kept it from dying during a power surge?

I dont think so. I think grounding pertains to the metal part of the doorbell itself being "live" in case the live wires some how come in contact with the doorbell. If you can't fix it you may want to consider buying a wire-less doorbell.


Edited by Warstud (01/20/18 01:04 PM)

Top
#4640973 - 01/20/18 01:03 PM Re: Doorbell repair? Transformer not grounded? [Re: Reddy45]
JHZR2 Offline



Registered: 12/14/02
Posts: 41805
Loc: New Jersey
How old of a home?

Our transformer is ungrounded because it's plugged into a two-prong outlet in the basement. Has been this way for probably 50-100 years.

That ground is just a chassis safety in case a winding gets shorted to the case. It has no role in anything else. Asssuming its new construction, I'd have assumed the builder would wire it stratight to Romex, and it would be a no brainer to ground.

Top
#4640982 - 01/20/18 01:11 PM Re: Doorbell repair? Transformer not grounded? [Re: Reddy45]
Papa Bear Offline


Registered: 08/11/05
Posts: 7054
Loc: Leamington, ON, Canada ..... r...
The transformer says on it to "install in metal box". That would ground the case.
_________________________
2016 Dodge GC Deep Cherry
2013 SYM Wolf Classic
2011 Suzuki S40
https://www.hogsforhospice.com/

Friend of Bill W. since '89


Top
#4641001 - 01/20/18 01:35 PM Re: Doorbell repair? Transformer not grounded? [Re: JHZR2]
Reddy45 Offline


Registered: 08/15/08
Posts: 2973
Loc: USA
Originally Posted By: JHZR2
How old of a home?

Our transformer is ungrounded because it's plugged into a two-prong outlet in the basement. Has been this way for probably 50-100 years.

That ground is just a chassis safety in case a winding gets shorted to the case. It has no role in anything else. Asssuming its new construction, I'd have assumed the builder would wire it stratight to Romex, and it would be a no brainer to ground.


14 years old, so newerish construction.

The black and white wires were wired direct to romex with wire caps.

Anyway I found a replacement for around $20 shipped so no biggie.

Top
#4641008 - 01/20/18 01:39 PM Re: Doorbell repair? Transformer not grounded? [Re: Reddy45]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 706
Loc: Canada


Bad installers snip off wires so they don't have to connect them!! frown

A ground wire on a device, does nothing for lightning, but provides a path to
ground to blow / "clear" the fuse so the faulty device no longer has power on it.

These transformers usually make 24V AC, but measure lower depending on the meter you use (AC true RMS,
AC average responding or just crummy!)

In your case, it's likely the chine faulted and melted and took out the transformer, they often
have a small thermal link inside the transformer winding.

If you're next transformer has a green wire, ground it, they provided a wire since the metal
core of the transformer is not connected to the outside housing, a 2 wire transformer will
have the core bonded to the housing per UL and CSA certification rules.

Top
#4641014 - 01/20/18 01:42 PM Re: Doorbell repair? Transformer not grounded? [Re: Reddy45]
Variant_S Offline


Registered: 02/14/17
Posts: 27
Loc: SW of Chicago, IL
Originally Posted By: Reddy45

I pulled the chime and the transformer off the wall, and one of the "plungers" that makes the noise was flat out MELTED. We had some bad storms about a year ago where the power cut on/off about a dozen times in a 5 minute period, so this probably did it.


I had a melted plunger/striker when the house was about 5 years old. I got a kit with a mechanical bell from Home Depot for about $15. I just installed the bell, left the rest in the box.

Top
#4641147 - 01/20/18 04:42 PM Re: Doorbell repair? Transformer not grounded? [Re: Reddy45]
mk378 Offline


Registered: 09/27/15
Posts: 1421
Loc: USA
The chime solenoid and the transformer are only designed for intermittent duty. If the solenoid melts and/or the transformer burns out, either the button is stuck or someone has been holding it down for several minutes at a time.

Top