No, there are two dimensions larger than Romex® 6/3 which are a 4 AWG and a 2 AWG that come in a three conductor variation only. Each of the 3 diverse sizes has 3 THHN electrical wires with insulation and 1 bare copper ground wire without having insulation. All 3 variations come with a black outer jacket.
Romex® 6/3 is the most popular variety of NM-B cable not like the circuit measurements of 14, 12 and 10 AWG. It is popular to operate a Romex® 6/3 electrical cable to a new electricity source which gives a new barn or garage a selected amount of money of electricity to allocate in the course of the lights and retailers in that new space. The 6 3 cable is also a typical sizing to electric power up a new hot tub or spa within of your home.
Be thorough not to use Romex® when working electrical power to anything outdoor even if it can be in conduit. You can have to update to an MC cable or UFB cable which are both equally approved for outside and conduit use. UFB stands for Underground Feeder which is also authorized as an underground cable without the need of conduit or raceway.
Larger sized sizes of Romex® such as 4/3 and 2/3 are employed when your new garage or barn need to have a lot more electric power than a 6 AWG 3 conductor cable can present. The larger the copper the more electrical power it brings to a supply. The moment the ability has been applied to the new electrical box it can be dispersed to the distinctive smaller sized resources that will need ability as very well.
The only change involving an NMB cable and a UFB cable is the outer jacket. The rest of the cable remains the identical in phrases of qualities. For example, both cables appear with THHN wires and a bare copper ground wire. For that reason, both of those cables perform the exact quantity of electric power. The big difference arrives with the total of safety presented by the outer jacket. Romex® arrives with a thin PVC jacket when UFB has a substantially far more protecting PVC jacket that surrounds every single conductor individually. The NMB cable jacket can be penetrated by outside dampness and gasses while the UFB jacket can’t.
It can be wise to explore your application with your supplier and your electrician to make confident you have enough power and sufficient safety primarily based on the environment your cable will be placed in. You want to make guaranteed you happen to be heading to pass inspection which is a lot much more critical than saving a handful of bucks on the installation costs.