Reply
 
Thread Tools Display Modes
Old 08-23-2015, 10:04 AM   #31
Senior Member
 
MarsMan's Avatar
 
Join Date: Jul 2015
Location: Maritime Provinces
Posts: 238
I wish I knew more- still learning
Attached Thumbnails
Click image for larger version

Name:	mj.jpg
Views:	80
Size:	22.6 KB
ID:	86598  
__________________

__________________
MarsMan

2015 Coachmen Prism 24J MBS
USN-R '01-present
MarsMan is offline   Reply With Quote
Old 08-23-2015, 10:05 AM   #32
Member
 
Join Date: Jan 2015
Location: Poconos, PA
Posts: 79
Quote:
Originally Posted by westom View Post
That was answered repeatedly - for human safety. One of many human protection layers.
No.. Not just for human safety..

Also found this explanation online..

"Some appliances and electronic devices may be damaged if polarity is reversed

Some appliances and some electronic equipment may be damaged if left connected to a reversed-polarity electrical circuit.

We disassembled a coffee maker that had burned-up and found that the appliance had been damaged by being left connected to its receptacle with polarity reversed. The presence of live voltage at the "wrong end" of a circuit or circuit board may cause some devices on the board to remain energized even when the device has been "switched off". A result can be overheating or electrical shock hazards."

Joe
__________________

__________________
meganjoe is offline   Reply With Quote
Old 08-23-2015, 10:28 AM   #33
Member
 
Join Date: Oct 2012
Posts: 95
Quote:
Originally Posted by meganjoe View Post
Also found this explanation online..
"Some appliances and electronic devices may be damaged if polarity is reversed
Which part in a coffee maker was damaged? Why would reverse polarity damage it? Just because you saw damage does not mean polarity was relevant. I have done this stuff professionally for 40 years. Suddenly everything I knew was wrong because someone posted something on the internet - without even one reason that says why?

It was on the internet - so it must be true. Classic junk science reasoning.

Multiple posters noted reverse polarity does not cause appliance damage. Even posted were some reasons why including galvanic isolation and filters intentionally designed to work with every polarity. Even made obvious by "black wire + when white wire -" and "black wire - when white wire +". Why ignore that? If reverse polarity causes damage, then AC cannot exist. Because polarity is constantly normal and reversed 60 times every second.

Conclusions only from observation are classic junk science reasoning. That quoted poster has no electrical knowledge - as demosntrated by the missing reasons why. Same logic also proved smoking cigarettes increases health. Why do you let them brainwash you. Every part in the coffer maker sees normal and reversed polarity 60 times every second. So every coffee maker must be damaged when connected to AC mains - using his reasoning.
__________________
westom is offline   Reply With Quote
Old 08-23-2015, 11:01 AM   #34
Mod free 5er
 
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,215
As westom stated, also years ago the electricians didn't pay much attention to which wire went on which side of an outlet. Only in the last few years since they came out with the wide tang plugs for making sure the appliance was plugged in properly for the grounding to be proper. Hot on the gold(wide tang socket), neutral on the silver and ground on the green.
__________________
OldCoot is offline   Reply With Quote
Old 08-23-2015, 11:06 AM   #35
Senior Member
 
fonzie's Avatar
 
Join Date: Sep 2010
Location: Eastern Ontario
Posts: 3,237
Quote:
Originally Posted by OldCoot View Post
As westom stated, also years ago the electricians didn't pay much attention to which wire went on which side of an outlet. Only in the last few years since they came out with the wide tang plugs for making sure the appliance was plugged in properly for the grounding to be proper. Hot on the gold(wide tang socket), neutral on the silver and ground on the green.
Tiny correction:

Hot on the gold(small tang socket), neutral on the silver (wide tang socket) and ground on the green.

__________________
Fonzie
2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
2008 F250 Lariat CC SB 6.8L V10 4.10 axle ratio (NITTO TERRA GRAPLER G2 LT275/65R20E)
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
Nights Camped: 2011(21) 2012(36) 2013 (17) 2014 (18) 2015 (18) 2016 (36) 2017 (32)
fonzie is offline   Reply With Quote
Old 08-23-2015, 11:08 AM   #36
Senior Member
 
Join Date: Apr 2015
Location: Orlando
Posts: 427
Reverse polarity has the potential to cause damage and is a safety issue. By the way the frequency is 60 hertz or cycles per second meaning the polarity is reversed 60 times a second not 120. As stated previously reverse polarity is the when the hot and neutral are reversed. Here's the problem- Most electrical appliances and devices are designed so that their "on-off" switch interrupts electrical power at the point of entry into the appliance or device circuitry components. If you switch the hot and neutral wires that may not quite be the case and parts of the device will remain energized even when the switch is OFF. No electrical current may flow, but it could flow if someone touches the wrong part of the device.
__________________
Brewhedd is offline   Reply With Quote
Old 08-23-2015, 11:14 AM   #37
Mod free 5er
 
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,215
Quote:
Originally Posted by fonzie View Post
Tiny correction:

Hot on the gold(small tang socket), neutral on the silver (wide tang socket) and ground on the green.

I stand corrected, CRS and too lazy to look at a receptacle. Thanks!
__________________
OldCoot is offline   Reply With Quote
Old 08-23-2015, 11:22 AM   #38
Mod free 5er
 
Join Date: Mar 2008
Location: Concord, NC
Posts: 24,215
I would wager that there are a lot of older homes that are not wired for the new appliances with respect to hot & neutral wiring on the receptacles. A lot don't even have the narrow/wide receptacles.
__________________
OldCoot is offline   Reply With Quote
Old 08-24-2015, 10:14 AM   #39
Member
 
Join Date: Oct 2012
Posts: 95
Quote:
Originally Posted by OldCoot View Post
I would wager that there are a lot of older homes that are not wired for the new appliances with respect to hot & neutral wiring on the receptacles. A lot don't even have the narrow/wide receptacles.
And all appliances must work just fine on all wiring from 1930 till today.

Again, polarity is only for human protection; is irrelevant to appliance protection. Other features that provide human safety protection layers include galvanic isolation, double insulated, safety ground, circuit breakers, arc fault breakers, and GFCIs. Also for human protection; not for appliance protection.

Back to the original topic - what is measured to determine polarity reversal might also detect completely different anomalies. Those other anomalies would explain why 'reverse polarity' appears to come and go. To say more (that is not wild speculation) requires voltage numbers from a meter.
__________________
westom is offline   Reply With Quote
Old 08-25-2015, 06:24 AM   #40
Member
 
Join Date: Jan 2015
Location: Poconos, PA
Posts: 79
Does a product work if reverse polarity exists? The short answer is yes, but the plug configuration now bypasses safety mechanisms that would normally protect the product from potentially becoming dangerous. What is bypassed is the fuse in the appliance designed for the hot source is now on the neutral side; if a power surge travels to the outlet or product, the fuse can interrupt the electricity and protect the electrical components thereby avoiding the potential for a fire.

Joe
__________________

__________________
meganjoe is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 09:51 PM.