โAug-05-2017 07:44 PM
โNov-17-2018 07:27 PM
Bobbo wrote:
I am reviving this old thread with some news that will make Gdetrailer happy.
โNov-17-2018 04:31 PM
rbpru wrote:
This seems like a lot of to-do over a simple situation. If you need a 12 volt power outlet you buy wire and install it.
If you do not know how, hire it done.
โNov-17-2018 04:01 PM
โNov-16-2018 02:16 PM
โNov-13-2018 10:35 AM
โAug-07-2017 07:03 AM
โAug-06-2017 08:34 PM
โAug-06-2017 07:55 PM
Walaby wrote:
Only time I saw a reference to you using a green wire was after it was pointed out to you. Sure, technically, it may be fine, but wouldn't it make sense to do it in full compliance with the standards?
Any new owner, if he had to trace that line, would find it spliced into a green wire, and then grounded on the 120V side and wonder WTF... And what else is not correct.
Mike
โAug-06-2017 07:51 PM
โAug-06-2017 07:44 PM
Gdetrailer wrote:
Green on 12V is NOT generally accepted as a NEGATIVE wire, period.
Gdetrailer wrote:
Bad form, followed by more bad form = epic fail.
Gdetrailer wrote:
RV 12V wiring uses WHITE for the negative, no other colors are used for that purpose.
All other colors including black are 12V POSITIVE..
Gdetrailer wrote:
What I would have done instead of all the haphazard hacking would be to run a new run using typical RV 12V wiring colors (white is neg and black or other colors are positive) from the 12V outlet to the CONVERTER fuse panel OR directly to the battery. I would have used 14 ga wire for a short run and possibly 12 ga wire for a longer run just to keep the voltage drop to a minimum.
At the converter I would have connected the negative directly to the negative terminal on the 12V FUSE PANEL. IF the fuse block does not have a negative terminal I would have traced the 12V negative out the BACK of the panel and then SPLICED there.
I would NEVER, EVER consider using the 120V side of the panel for this type of modifications even though the ground terminal in the 120V side is at the same potential it is not a good idea..
To put this another way, the 120V ground is for SAFETY, there is a BONDING wire that goes to the frame. This wire is typically 10 ga or 8 ga and is there only to ensure all metal of the trailer will be at 120V ground potential.
It is bad form due to the fact that someone else who is not familiar with YOUR modification may mistake that fake green wire for the wrong use.
Gdetrailer wrote:
While YOU don't see the error of your ways and feel it is "safe" you are voiding any and all NEC rules on keeping separation between 120V and low voltage systems just by having that fake green wire running into the 120V box..
โAug-06-2017 07:23 PM
โAug-06-2017 06:32 PM
itguy08 wrote:
How is connecting 12V and 120V grounds safe???? If the 120V uses the ground as the neutral you'll be sending 120V into the negative power path of the 12V system right? (assuming it's negative ground like a car)
Gdetrailer wrote:
In practice however, it IS bad form to MIX high voltage (120V) and low voltage (12V) systems in side the same junction box..
The converter power panel is designed to maintain separate high voltage and low voltage sections and for good electrical practice the OP SHOULD MOVE the 12V NEGATIVE connection from the 120V section.
The OP needs to look BEHIND the power panel, there WILL be a bundle of 12V NEGATIVE wires (these wires should all be WHITE) all connected via one huge wire nut..
Low voltage connections (in the past, not sure if that is true now days)were/are treated differently by NEC in the fact that there was no requirement for a enclosed junction box for low voltage connections..
That's where the OP should have tied in at..
Gdetrailer wrote:
Pretty much a total waste of time and materials.
I would have simply downgraded the fuse to meet the 18ga wire fusing requirements.. 7.5A would have been the correct fuse size..
Those outlets are merely put in as a CONVENIENCE to allow SMALL LOW CURRENT 12V devices to be plugged in.
Things like small 12V TVs(12"-15" and under 4A draw), portable radios, chargers for cell phone, laptops, tablets..
Was not designed for high current draws for things light 1200W inverters, 50" plasma TVs and full on concert level sound systems..
The 12V cig outlet you typically find can only handle a max of 8A (EIGHT AMPS) at 12V which comes out to a whopping 96W..
If you NEED higher current draw then I would suggest looking at marine 12V outlets, I believe they can be found with up to 15A current ratings but you would also need to make sure the PLUG you use is also rated for that draw..
itguy08 wrote:
Bad wording on my part - what I meant was in a failure scenario where the neutral is not working and the ground becomes the neutral (as its designed to) wouldn't you be sending 120v to the 12v side?
Gdetrailer wrote:
The only issue I see is the OP decided to put a 12V DC negative wire into the 120V side of the converter and connect it to the 120V GROUND BUSS BAR terminals.
The 12V negative wire is WHITE, 120V ground wiring is supposed to be only GREEN (covered) OR BARE wires..
Placing a white wire on the ground buss bar is a potentially confusing situation that may lead to someone eventually MOVING the 12V negative wire to the 120V NEUTRAL BUSS BAR in the future!!!
Gdetrailer wrote:
NEC also insists that there is a PHYSICAL separation between 120V and low voltage 12V.. That is why the 120V section has a separator between the 120V breaker panel and the 12V fuse panel and ALL 120V is in the breaker section and ALL 12V wiring is in the FUSE section..
OP VIOLATED the 120V VS low voltage 12V separation by placing a 12V wire INSIDE the 120V breaker section of the converter and making matters worse, a WHITE wire connected to the ground BUSS bar.
Gdetrailer wrote:
NEC does have different rules on handling 120V vs 12V in how the wiring is done.
As I mentioned before, OP NEEDS to disconnect and move the 12V negative wire OUTSIDE the 120V side (breaker panel side) and find the 12V negative pigtail (all low voltage white wires connected together in a bundle) that should be BEHIND THE CONVERTER in order to make the proper connection..
Walaby wrote:
OP should correct the wiring snafu. If he ever sells it, might create an issue for the new owner.
Mike
โAug-06-2017 06:19 PM
โAug-06-2017 05:35 PM