Shore Power socket causing reverse polarity? Maybe

[goboatingnow]

The point is a yacht wired for single phase 240 vac must be safe if polarity is reversed if you follow the iso spec it is safe. Hence polarity reverse indication. Is not Connon and many users have no idea or don’t care anyway. It’s a US @ thing “ precisely because all the neutral bonding in ABYC exposes you to reverse polarity dangers , whereas iso wired boats do not expose you to any further dangers the presence of multiple RCBOs in the circuit historically missing in thevUS , means there’s has to be more concern in tne US then elsewhere. This is a fault of poor ABYC thinking and practice.

[boatpoker]

Originally Posted by goboatingnow

It’s a US @ thing “ precisely because all the neutral bonding in ABYC exposes you to reverse polarity dangers

What neutral bonding ?

[goboatingnow]

Originally Posted by boatpoker

What neutral bonding ?

Read the ABYC specs

[boatpoker]

Originally Posted by goboatingnow

Read the ABYC specs

So you don't know ?

[goboatingnow]

Originally Posted by boatpoker

So you don't know ?

Oh I know but I’m not in the business of educating decorators who couldn’t be bothered to read them. !!!

[boatpoker]

Originally Posted by goboatingnow

Oh I know but I’m not in the business of educating decorators who couldn’t be bothered to read them. !!!

Then what is your point of posting ?
I don't think you actuially know the ABYC Standard position on neutral bonding. Your response speaks for itself.

[goboatingnow]

Originally Posted by boatpoker

Then what is your point of posting ?
I don't think you actuially know the ABYC Standard position on neutral bonding. Your response speaks for itself.

I can quote it almost verbatim. But the point is the ABYC structures on neutral bonding make reverse polarity problematic which is then why you see all this focus on reverse polarity in us boats.

Iso generally takes the European approach where it cannot be assumed neutral is anywhere near earth potential though it typically is. Hence there is far Less focus on reverse polarity as the system is safe so reversed. You don’t see navy reverse polarity lights in European boats as a result so many people are completely unaware.

[boatpoker]

Originally Posted by goboatingnow

I can quote it almost verbatim. But the point is the ABYC structures on neutral bonding make reverse polarity problematic which is then why you see all this focus on reverse polarity in us boats.

Iso generally takes the European approach where it cannot be assumed neutral is anywhere near earth potential though it typically is. Hence there is far Less focus on reverse polarity as the system is safe so reversed. You don’t see navy reverse polarity lights in European boats as a result so many people are completely unaware.

Still no answer ... is it a secret ?

[goboatingnow]

Originally Posted by boatpoker

Still no answer ... is it a secret ?

Not if you bother to read the iso and ABYC specs. No. It will be self evident

[s/v Jedi]

Another thread going to h@ll in arguing.

To the OP, from a Dutchman: I get that you are sick of this. Here is the permanent cure, it only has one catch and that is that it costs money.

Make your installation exactly like in the attached diagram. Look carefully at the ground wires: ground from shore is not connected to ground aboard, as the isolation transformer separates the two. Also, this transformer can make 120V out of 230V so you can remove your step down transformer, but I would suggest to change to 230V and this same transformer can make 230V from shore 120V if you ever get that.

Also, the shore power inlet: change it to the European blue plug system.

Then last but not least: after this is installed, disable/remove the reverse polarity indicator, it isn’t needed anymore because your isolation transformer has set you free. This is the safest installation you can have.

[goboatingnow]

No the problem is people arguing without bothering to do sone basic research especially across the different systems in boats and mains installations in different countries

Agree with you re isolating transformers. Great things but heavy and expensive.

[smac999]

Originally Posted by goboatingnow

Why would you stick you fingers in a sockets

Secondly of course the RCD TRIPS

clearly you don’t understand Mains wiring reverse polarity is extremely common. The neutral IS a live wire

30ma will still kill you. that is why gfi outlets are only 5ma.

I understand north american mains wiring and the neutral is never live and polarity is always made correct.

and as far as I know on 230v 50hz euro wiring there is also a grounded netreal. by this post it seems that varies by country.

[skipperpete]

Don’t maintain this point of view too strenuously, one of my earlier boats was wired such that 240v appliances had active neutrals (2x120v). This was from the manufacturer, not done by a deranged amateur electrician.
Play it safe and regard neutrals as potentially active, nothing to lose and a lot to gain.

[goboatingnow]

Originally Posted by smac999

30ma will still kill you. that is why gfi outlets are only 5ma.



I understand north american mains wiring and the neutral is never live and polarity is always made correct.



and as far as I know on 230v 50hz euro wiring there is also a grounded netreal. by this post it seems that varies by country.

Let’s not reopen this nonsense 30mA debate . It’s been a safety standard in Europe for decades. European safety standards in mains are decades ahead of the us. . It’s been Proven to be safe and effective. Like climate change the 30 mA debate is OVER

30mA whole house rcd has been shown in Europe to confer huge safetybenefits and as a result required everywhere.

Us domestic main safety at home or in marinas has been deficient for decades

In Europe you cannot assume neutral is at earth potential and nobody does. With comprehensive RCBO installs it doesn’t matter anyway .

My experience is US wiring in houses and marinas is you can find any rubbish wiring