EMS showing 123 volts on 30 amp outlet

[Moose61]

30amp outlet is showing 123 volts, I am no electrician, will this be an issue ?

Thanks

[cavie]

Originally Posted by Moose61

30amp outlet is showing 123 volts, I am no electrician, will this be an issue ?

Thanks

What makes you think this is an issue? The nominal voltage in the US and Canada is 120 volts +/- 10%

[formerFR]

normal stated voltage is 120, but it's a 'range' since no power utility is going to be, or always be, exactly 120. Most power utilities would relish having 123.

by the way, how do you 'know' that it's 123?

[wmtire]

Originally Posted by Moose61

30amp outlet is showing 123 volts, I am no electrician, will this be an issue ?

Thanks

You are good, as voltages do fluctuate some. This link may help:

Learn About the US Voltage Standard with Quick220^®

These voltage fluctuations are one of the things that an EMS protects against (if you have one installed for your RV). It will protect your appliances and such by shutting off incoming power to your RV should the voltage fluctuate too low or too high, thus preventing damage to the things in your RV.

http://www.progressiveindustries.net/ems-pt30x

[wahoonc]

No issue. IIRC 20% +/- is considered with in range.

Aaron [emoji41]

[joshuajim]

Originally Posted by wahoonc

No issue. IIRC 20% +/- is considered with in range.

Aaron [emoji41]

You’re saying that 96v or 144v is OK? I think not!

[Moose61]

all

Thanks for the input

I had some electrical issues at a campground recently, so I purchased a surge guard EMS unit, and it was showing 123 volts at at the box (different campground) I just ran off battery for the evening to be safe.

Thanks again

[wmtire]

Originally Posted by Moose61

all

Thanks for the input

I had some electrical issues at a campground recently, so I purchased a surge guard EMS unit, and it was showing 123 volts at at the box (different campground) I just ran off battery for the evening to be safe.

Thanks again

An ems should actually cut power to your RV if the voltage is too high or too low, as I previously explained in my post.

That's a few of the good things it does, as it does much more.

[Mr. Dan]

Originally Posted by joshuajim

You’re saying that 96v or 144v is OK? I think not!

Probably should have said "10% +/- is considered with in range" as stated above.

[cavie]

Originally Posted by wahoonc

No issue. IIRC 20% +/- is considered with in range.

Aaron [emoji41]

Nope, it's +/- 10% of 120 volts

Residential voltage range
The voltages are generally in the range 100–240 V (always expressed as root-mean-square voltage). The two commonly used frequencies are 50 Hz and 60 Hz. ... In the United States and Canada, national standards specify that the nominal voltage at the source should be 120 V and allow a range of 114 V to 126 V (RMS) (−5% to +5%).


I believe Progressive EMS will give you 108 to 132. I could be wrong.

[Boomerweps]

Hit the web search for "Voltage Calculator". Great resource. It will calculate voltage loss for a given cable length, gauge, and amperage use. Fairly accurate compared to my Kill-A-Watt meter.
Discovered at approximately 180 feet of 12AWG from the house Circuit breaker box feeding just the converter and air conditioning running, voltage dropped to 100.7 volts! Bad for the control circuits and start the fridge and the breaker pops!Great TT storage location, just sucked for power. Initially had the TT on a pad outside the back door, no probs. Last moved the TT to the near side of the garage, about 90 cable feet. Air & DC converter only running, voltage was 107.7 volts. Not great but tolerable for use. I've since added a Progressive Industries EMS. I've noticed 4-5 voltage deviations in power from day to night in nice weather from the power supplied to the house, maybe from neighborhood use?
Intend to run 8awg cable straight across the yard to the side of the garage next summer to keep the voltage loss to under 3%.
Short story, long, sorry. Check the voltage with your typical RV loads running, it will be lower.

[Mr. Dan]

Originally Posted by cavie

Nope, it's +/- 10% of 120 volts

Residential voltage range
The voltages are generally in the range 100–240 V (always expressed as root-mean-square voltage). The two commonly used frequencies are 50 Hz and 60 Hz. ... In the United States and Canada, national standards specify that the nominal voltage at the source should be 120 V and allow a range of 114 V to 126 V (RMS) (−5% to +5%).


I believe Progressive EMS will give you 108 to 132. I could be wrong.

OK, I understand this: "I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant" but '+/- 10% of 120 volt' and '(−5% to +5%)' are not the same where I learned math.

[cavie]

Originally Posted by Mr. Dan

OK, I understand this: "I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant" but '+/- 10% of 120 volt' and '(−5% to +5%)' are not the same where I learned math.

google search will give you different answers from different sources. Florida Power and Light uses 10% up and down from 120 108/132 as an acceptable voltage. Others use 5%. No power companies allow more than 10%. Your POCO may be different.

Progresive Industries EMS uses 104/132. 14% down and 10% up.

This from PG & E

https://www.pge.com/includes/docs/pd..._tolerance.pdf

[spock123]

Originally Posted by wmtire

An ems should actually cut power to your RV if the voltage is too high or too low, as I previously explained in my post.

That's a few of the good things it does, as it does much more.

Can one open up a Progressive Industries portable unit and fix it yourself. I’m getting tired of taking my unit back

[lesptr]

Rv electrical class I sat in at two rallies said that Forrest river products are designed to work at 108-132 vac.

[cavie]

Originally Posted by spock123

Can one open up a Progressive Industries portable unit and fix it yourself. I’m getting tired of taking my unit back

Are you using surge protectors or EMS units? Two different animals.

[Fifth Wheelers]

Wish I could get 123 volts lucky if I get 115 volts where we stay. Best