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Old 03-09-2020, 06:34 PM   #1
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50 Amp Surge Protector in 30 Amp Service?

Hi,

Shopping has been fun but confusing! We have narrowed down what we want, a 25' Flying Cloud BUT see them with one or two ACs. We have gathered that the two AC models will be 50 amp if not both models.

We have not been finding the complete "start up kit" at reasonable prices in stores so are shopping for deals like fiends!

We figure best to get a 50 amp surge protector and are considering the Progressive Industries EMS-PT50X but not sure if can use if we find a 30 amp FC we like....Last time we had quite a hassle getting one and the stores sold them for $100+ more than online so one item we hope to plan ahead for.

I imagine there are a few 30 amp only parks so it must be ok? I doubt anyone carries 2 expensive devices!

Thanks!

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Old 03-09-2020, 07:30 PM   #2
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Walstib, good for you thinking ahead about the importance of an EMS!

We have a 27' Globetrotter with 50A service and got the PD unit you mentioned (EMS-PT50X). If the campground only has 30A service, you can use a 30A-50A dog bone between the pedestal and your EMS. Airstream includes one with each trailer.

If you end up getting a 30A trailer, it would be less hassle to have a 30A EMS.

I tested out Champion generator in the driveway last year with a 30A extension cable to the dog bone then to the 50A EMS (see below).

Good luck!
Jeff
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Old 03-09-2020, 07:46 PM   #3
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Hi

The process of buying a trailer will take weeks to complete. An EMS is something you can get delivered in about 2 days. There is no need to stock up on them. Get the one you need. If you buy a 30A trailer, get the 30A EMS ....

Bob
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Old 03-09-2020, 08:13 PM   #4
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Hi

The process of buying a trailer will take weeks to complete. An EMS is something you can get delivered in about 2 days. There is no need to stock up on them. Get the one you need. If you buy a 30A trailer, get the 30A EMS ....

Bob
Last time we ordered when stock was low. Received an open box used one. Took a couple weeks to get a new model.

We have our eye on one out in AZ and may head out this week end if we can come to an agreement on the phone!

Thanks!

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Old 03-09-2020, 09:13 PM   #5
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you can use the 50A model
it support the two phase input ie 2 110v run to make the 220V

thus on 30a service, only one phase is used
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Old 03-10-2020, 04:45 AM   #6
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If you'll be camping in the deep south, two A/Cs are the way to go. A single can't deal with both the heat and humidity. Only the duals have 50A service.

I have an unused Portable Surge Guard 34850 50A which protects against high and low voltage, reverse polarity and high neutral current etc. I bought it before buying the trailer and my trailer has one hardwired. Let me know if you're interested. I would wait to buy one 'cuz dealing with a dog bone all the time is just one more hassle you don't need and the 30A units are less expensive, your call.

As others have mentioned, no issue using a 50A protector for a 30A load.
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Old 03-10-2020, 06:38 AM   #7
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Maybe the trailer you want will have a built in surge guard?
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Old 03-10-2020, 07:41 AM   #8
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Originally Posted by Walstib View Post
Last time we ordered when stock was low. Received an open box used one. Took a couple weeks to get a new model.

We have our eye on one out in AZ and may head out this week end if we can come to an agreement on the phone!

Thanks!

Hi

Some people spend months and months before they can use their "new" trailer. 99.9% of the time the EMS can get to you in two days (assuming you don't live someplace weird).

Bob
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Old 03-10-2020, 08:37 AM   #9
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Quote:
Originally Posted by Walstib View Post
I doubt anyone carries 2 expensive devices!
This is the Airstream forum. Where excess is the norm!
I confess I have a 30 amp and a 50 amp. But I have 30 amp power at my storage lot, and my choice seemed to be putting my expensive 50 amp out with the dog bone, use nothing, or get a 30 amp. I decided to buy the slightly lesser 30 amp Progressive Industries SSP-30XL. I had one on my previous MH and let it go when I sold it.
If I'm at a 30 amp site, I use it. About $100.
I also have a 30 amp power cord and a 50 amp power cord.
On the road, simplicity.
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Old 03-10-2020, 10:01 AM   #10
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You can also use one of these. It helps to keep your EMS up out of the dirt/water if park has short pedestals.
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Old 03-10-2020, 10:55 AM   #11
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Hi

Some people spend months and months before they can use their "new" trailer. 99.9% of the time the EMS can get to you in two days (assuming you don't live someplace weird).

Bob
Card carrying member of the .1%'er club! Bad Luck Schleprock my handle!

When ever I need an essential my timing is off for supply or receive broken returned item...

Buy the best and cry once, plan ahead! It's kept me out of the stores the past few weeks of hysteria and hoarding.

BTW IF you're experiencing any local hoarding of essentials Amazon still has good supplies of mega packs. So if you need 6 months to a year supply of any necessities don't let the locals gouge ya!
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Old 03-10-2020, 11:56 AM   #12
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Why spend extra for a 50 amp model when and if you get a 30 amp trailer? Pick you trailer then buy the matching EMS or surge protector. I bought one when I saw it was on sale and have seen sales on them numerous times over the last year.
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Old 03-10-2020, 02:51 PM   #13
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50-amp Dual A/C and power

Our 25' FC has two air-conditioners, and in the Texas summer, both are needed!


Recommend getting both a 30-amp set-up and a 50-amp set-up. Some parks may only have one or the other, so you would be prepared for anything.


Also, wrestling the big 50-amp cable in cold weather is a real battle! The 30-amp is so much easier to coil and uncoil, and tuck into whatever storage compartment you are using. Get the trailer, then invest in both sets of power cable.



But in the hot summers, be thankful you have two A/Cs and that big 50-amp power hardware!
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Old 03-10-2020, 04:38 PM   #14
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Get a Progressive EMS, the model we have will take 50 and 30 amps. They make a adapter that will convert your 50 amp cord down to 30 amp connector. Works better than the 'dog bone'. Amazon has a adapter that coverts 30 amps down to 20 (110v) if needed. Be very aware what you plug in as you downsize!
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Old 03-11-2020, 06:05 AM   #15
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Quote:
Originally Posted by 69SoulShine View Post
You can also use one of these. It helps to keep your EMS up out of the dirt/water if park has short pedestals.
69SoulShine, thanks for the tip! I added it to my Amazon Wish List for the next RV part order
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Old 03-11-2020, 07:13 AM   #16
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Quote:
Originally Posted by BayouBiker View Post
If you'll be camping in the deep south, two A/Cs are the way to go. A single can't deal with both the heat and humidity. Only the duals have 50A service.

I have an unused Portable Surge Guard 34850 50A which protects against high and low voltage, reverse polarity and high neutral current etc. I bought it before buying the trailer and my trailer has one hardwired. Let me know if you're interested. I would wait to buy one 'cuz dealing with a dog bone all the time is just one more hassle you don't need and the 30A units are less expensive, your call.

As others have mentioned, no issue using a 50A protector for a 30A load.
How do you reverse polarity in an AC circuit?
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Old 03-11-2020, 08:41 AM   #17
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How do you reverse polarity in an AC circuit?
From things being miswired. I once had a circuit showing "Hot and Neutral Reversed", but I couldn't find it. Turned out to be a power strip behind a bookcase. How does a power strip get reversed? No idea, but it was.
You could run things for a long time and never notice it. I found mine because a friend was getting a slight shock from guitar strings.
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Old 03-11-2020, 11:04 AM   #18
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Card carrying member of the .1%'er club! Bad Luck Schleprock my handle!

When ever I need an essential my timing is off for supply or receive broken returned item...

Buy the best and cry once, plan ahead! It's kept me out of the stores the past few weeks of hysteria and hoarding.

BTW IF you're experiencing any local hoarding of essentials Amazon still has good supplies of mega packs. So if you need 6 months to a year supply of any necessities don't let the locals gouge ya!
Hi

Ok, if cost is no object, buy a 30A external, a 50A external, a 30A internal, and a 50A internal. That way you will have the correct part for what you are doing regardless of what you happen to need. You could toss in the internal version with and without remote. You never know if the remote will fit. Same thing trying to put the bigger 50A box in a location the 30A would have easily fit in ......

Bob
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Old 03-11-2020, 10:37 PM   #19
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How do you reverse polarity in an AC circuit?
You can wire 120 AC "hot" to neutral and neutral to a hot and nearly all appliances and devices will run just fine for 30A and 15A-20A service so long as you don't sink a 5 foot copper grounding rod and ground your trailer. You will tend to light up a little bit each time you touch the trailer. More so down here in the south where the ground stays damp. If the 50A service is wired neutral to one of the hots, things get quite a bit more exciting as half of your branch circuits are now experiencing 220 and you have still have 120 on the the trailer skin.

In the oil field we colloquially refer to this as reverse polarity but I suppose you're right it is technically incorrect to use this term. We in the oilfield talk crude....
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Old 03-12-2020, 03:01 PM   #20
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Hi

Ok, if cost is no object, buy a 30A external, a 50A external, a 30A internal, and a 50A internal. That way you will have the correct part for what you are doing regardless of what you happen to need. You could toss in the internal version with and without remote. You never know if the remote will fit. Same thing trying to put the bigger 50A box in a location the 30A would have easily fit in ......

Bob
And a spare Airstream to tow behind right?

Look from what I understand a 50amp and adaptors covers everything? Are you serious about this or trying to be funny?

I'm sorry but I find a lot of responses on AF where there's all of a sudden a very strange response or something completely off topic or trying to make the OP seem foolish for planning ahead or considering something different. It's confusing but maybe how some of you have fun. I'll have to get used to that I suppose....

BTW...My 50 amp arrived today and.... it's missing the bezel to hold the cover...What did I tell you!



Thanks,
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