Power Pedestal Connections
We read an online RV newsletter that comes out each Saturday. Electricity is often a topic of discussion. Today there was a survey to try to tell what percent of readers have experienced some sort of ...
Forum Discussion
What skews 0 Delta T is the very thing that errs in most connections. Reliance on two-wire post "mufa" (service drop conduit) circuits. In a spare moment down here, check the integrity of service drop to earth grounding rod connections. Most of the time you will find an utterly corroded cable, clamp or "varilla" copper plated ground rod. Check perhaps twenty service entries and you will see perhaps three or four instances of ground cables disconnected by corrosion and electrolysis.
In a large RV park, earth ground eddy currents will inevitably enter the picture. This will cause a >.1 volt Delta T L1 to L0 and earth. There are so few instances of finding no difference, that I find it remarkable when I encounter one.
The one and only correct way to address this is to run an earth ground web throughout the park. Multiple ground rods*, and multiple connections bonding the web back to the service drop panel L0 / earth bonding junction.
*strategically located.
Sadly, this is all wishful thinking.
But all it a recreation learning experience. Take your meter along and verify (or refute) what I have written. The more kind folks who know about this, the better educated RVers will be if that information is shared.
Mexico is the land of
Just
Get
By
As far as electrical system and design integrity is concerned. The practice of twisting wire ends together with linesman pliers then wrapping black around the ends is troubling.
Mexican businesses love to use dual pole breakers which sounds like a good idea for 127 vac circuits. Protect both L1 and L0.
Then a breaker fails. a line voltage breaker. So the "electrcista" thinks "well it has the other breaker", right? He then spices in and out line voltage wires together. Leaving neutral protected. Line to earth ground has no protection. These points sound ridiculous and they are. But they have to be dealt with, like it or not.
In a large RV park, earth ground eddy currents will inevitably enter the picture. This will cause a >.1 volt Delta T L1 to L0 and earth. There are so few instances of finding no difference, that I find it remarkable when I encounter one.
The one and only correct way to address this is to run an earth ground web throughout the park. Multiple ground rods*, and multiple connections bonding the web back to the service drop panel L0 / earth bonding junction.
*strategically located.
Sadly, this is all wishful thinking.
But all it a recreation learning experience. Take your meter along and verify (or refute) what I have written. The more kind folks who know about this, the better educated RVers will be if that information is shared.
Mexico is the land of
Just
Get
By
As far as electrical system and design integrity is concerned. The practice of twisting wire ends together with linesman pliers then wrapping black around the ends is troubling.
Mexican businesses love to use dual pole breakers which sounds like a good idea for 127 vac circuits. Protect both L1 and L0.
Then a breaker fails. a line voltage breaker. So the "electrcista" thinks "well it has the other breaker", right? He then spices in and out line voltage wires together. Leaving neutral protected. Line to earth ground has no protection. These points sound ridiculous and they are. But they have to be dealt with, like it or not.
