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transfer switch 50 amp

billyboy
Explorer
Explorer
just wondering if anyone has seen a problem coming from the transfer switch when on 30 amps, I have several recepticles out , but when running the genny everything works fine. I don't have a 50 amp line at home to plug it into, so I don't know if it will do the same thing
09 winny adventurer 32h 33 ft towing 015 focus
23 REPLIES 23

DrewE
Explorer
Explorer
time2roll wrote:
AH HA!!!

Need to jump 30 amps to the other blade (#10 wire) or half the RV will remain unpowered.

Even better pop in a double 30a breaker and pull a new hot to the other blade.

Neither of these three options is up to code afaik. Need 40 amp or 50 amp 240/120 split phase power to meet code. Still technically safe either way.


I think the code permits one to use oversized outlets for circuits, though I'm not 100% certain about that. Going the opposite way is of course not permitted, with the one (very common) exception that multiple 15A 120V outlets may be placed on a 20A 120V circuit.

wolfe10
Explorer
Explorer
Yup, you have created your own problem.

30 amp has a SINGLE HOT. 50 has TWO HOTS.

So, jump from the single hot in the outlet to the other outer straight. That does exactly the same thing as a 30 to 50 adapter.
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

time2roll
Explorer II
Explorer II
AH HA!!!

Need to jump 30 amps to the other blade (#10 wire) or half the RV will remain unpowered.

Even better pop in a double 30a breaker and pull a new hot to the other blade.

Neither of these three options is up to code afaik. Need 40 amp or 50 amp 240/120 split phase power to meet code. Still technically safe either way.

billyboy
Explorer
Explorer
time2roll wrote:
OK so you must be using an adapter to put a 50 amp plug into a 30 amp supply.
30 amp is 3 pins and 50 amp is 4 pins. Or is this something else?

Check that the adapter is putting power on both hot pins. Then check if both the main breakers have power.

Then you have the inlet connection and the transfer switch to check.


I have a 50 outlet that is only wired for 30 amp, that way I can plug the big power cord into it, but it only has 110 on one blade.
09 winny adventurer 32h 33 ft towing 015 focus

MEXICOWANDERER
Explorer
Explorer
LOAD SHED

A protocol in which loads can be divested according to a pre-arranged sequence


a) prevention of application of a circuit overload by virtue of nulling the power source. Can be enacted for any pre determined condition.

b) elimination of a load for security (volts, amps, etc)

By automatically shedding a circuit, power is eliminated before load could be applied. Dead circuit.

time2roll
Explorer II
Explorer II
OK so you must be using an adapter to put a 50 amp plug into a 30 amp supply.
30 amp is 3 pins and 50 amp is 4 pins. Or is this something else?

Check that the adapter is putting power on both hot pins. Then check if both the main breakers have power.

Then you have the inlet connection and the transfer switch to check.

billyboy
Explorer
Explorer
time2roll wrote:
billyboy wrote:
just wondering if anyone has seen a problem coming from the transfer switch when on 30 amps

billyboy wrote:
But I am not using any adapters, I am just plugging in with the heavy 50 amp power cord
OK so is it 30 or 50?


I am plugging into to a good 30 amp box . The unit is a 50 amp m.h.using the 50 amp power cord that came with it.
09 winny adventurer 32h 33 ft towing 015 focus

billyboy
Explorer
Explorer
time2roll wrote:
billyboy wrote:
just wondering if anyone has seen a problem coming from the transfer switch when on 30 amps

billyboy wrote:
But I am not using any adapters, I am just plugging in with the heavy 50 amp power cord
OK so is it 30 or 50?


I am plugging into to a good 30 amp box . The unit is a 50 amp m.h.using the 50 amp power cord that came with it.
09 winny adventurer 32h 33 ft towing 015 focus

time2roll
Explorer II
Explorer II
billyboy wrote:
Ok, I am not getting any currant to either gfi box at all, with the boxes out of the wall to look for current.
Do you have voltage on both main breakers? Assuming you do check each branch circuit has voltage coming off each breaker.

Or if one of the mains is dead you need to work back to the transfer switch to verify voltage on both sides.

Keep moving along until you find the open connection.

time2roll
Explorer II
Explorer II
billyboy wrote:
just wondering if anyone has seen a problem coming from the transfer switch when on 30 amps

billyboy wrote:
But I am not using any adapters, I am just plugging in with the heavy 50 amp power cord
OK so is it 30 or 50?

wolfe10
Explorer
Explorer
billyboy wrote:
wolfe10 wrote:
Start by verifying that your adapter's female end (30 male to 50 female) DOES have 120 VAC between each outer straight and the center straight and center round. Zero center round to center straight.

Let us know what you find.
But I am not using any adapters, I am just plugging in with the heavy 50 amp power cord


Sorry. The first sentence of your first post had me fooled: "just wondering if anyone has seen a problem coming from the transfer switch when on 30 amps..."
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

billyboy
Explorer
Explorer
time2roll wrote:
+1 for bad adapter or some other loose connection.

Of course it would also be prudent to check the GFCI outlet is not tripped.

Ok, I am not getting any currant to either gfi box at all, with the boxes out of the wall to look for current.
09 winny adventurer 32h 33 ft towing 015 focus

billyboy
Explorer
Explorer
Cydog15 wrote:
MEXICOWANDERER wrote:
A Learning Moment For Mex...

With 240/50 rigs, is it a universal practice to enable all and everything but additional roof air conditioners when running on a single 120 vac leg? How is the shed of A/C power accomplished?

Thank You

Bestconverter has a Automatic load shed


The winne adventurer has a built in load shedding device built in, but I'm not using too much power to have to shed amp draw.
09 winny adventurer 32h 33 ft towing 015 focus

billyboy
Explorer
Explorer
wolfe10 wrote:
Start by verifying that your adapter's female end (30 male to 50 female) DOES have 120 VAC between each outer straight and the center straight and center round. Zero center round to center straight.

Let us know what you find.
But I am not using any adapters, I am just plugging in with the heavy 50 amp power cord
09 winny adventurer 32h 33 ft towing 015 focus