Temperature and Environmental Conditions:Įxtreme temperatures and environmental conditions can affect the performance of the wire. Considering the types of loads connected to the sub-panel is crucial in determining the wire size. Motor-driven loads, for example, often have higher starting currents. Type of Load:ĭifferent types of electrical loads have varying power characteristics. To compensate for this, a larger wire size may be required. Longer wire runs result in higher resistance, which can lead to voltage drops. The distance between the main panel and the sub-panel affects the resistance of the wire. I want to make sure it is ok to use these twin breakers.Also Read: How Big of a Generator to Run a 5000 BTU Air Conditioner? 1. My upstairs is 1200 square feet and my basement is about 900 but is not used much. I have done the calculator with future expectations and even if I put central air in I am looking at about a 65 amp load. I have a gas stove, hot water heater, dryer, gas boiler, etc. Now I have done the load calculator and currently I am using about 40 amps. I started to seperate a lot of stuff in my house onto it's own dedicated circuit, garage bathroom, etc. I am in the process of redoing my kitchen and now I have 4 seperate 20 amp breakers as opposed to the one single one I had running the whole kitchen. My first question is, is this safe to have a lot of these breakers. I have run out of room and now I am starting to replace breakers with the Twin breakers. Ok I have a 100 amp ITE Pushmatic breaker panel. Be careful to keep rocks out of the backfill if you've got rocky soil, the first couple inches of sand or peastone backfill is a good idea. Minimum depth allowed on residential land is 18" to the top of the cable, but if you've got a trenching machine it's no big deal to go 24" or 30". I would probably just bury that section deeper instead of using conduit. You could use a schedule 80 PVC conduit sleeve if you wanted for part of the run. > Will still probably place in conduit since part of run may come under The panel label and instructions will tell you the correct value for that brand. Finally, when you terminate the wire on the screw lugs, make sure to get the torque to the correct in-lbs using a torque wrench. You can get a tube of it in the electrical aisle for a few dollars. Apply lots of non-oxidation grease (NOALOX) to the bare aluminum I use a plumbing flux brush to work it down between the strands. > could use some help & advice on aluminum wire terminationĪfter you strip the wire, shine up the individual strands with a wire brush or emory paper. > Again is it ok to put 100amp as main breaker in sub panel & main When you install circuits in the barn, keep the grounds and neutrals on the correct bars. The instructions for the panel will say how to do this. This usually requires you to buy a ground bar kit for the panel and to remove a bonding screw or strap from the panel. This is also a good time to mention that the barn panel needs to have separate ground and neutral bars. This wire must be copper, aluminum is not allowed for ground rods. Use an acorn clamp on the top of the rod and run some bare #6 copper from the rod to the ground bar of the barn's panel. It should be 8' x 5/8" copper clad rod driven flush to the ground. You need at least one ground rod at the barn. > do i also need ground stake at pole barn? If you buy the aluminum cable I suggested, the ground is included. > #8 or #10 for bonding ground back to main panel > also plan to put 100amp main in sub at pole barn.Ī main breaker is required in the barn because it is a detached building. You still need conduit for protection on the ends where the cable runs out of the ground and into the buildings. It can be buried directly in the ground without the need for horizontal conduit. This is a cable assembly usually sold as 100A mobile home feeder. My recommendation is 4 conductor aluminum underground service cable 2/2/4/6 or 2/2/2/6. > Plan to run through conduit 18" underground Please post back if you need tips on aluminum wire termination. Aluminum is a little tricky to install, but copper would be very expensive for a 150' run. If the expect load is less than say 80A, #2 aluminum would be wire of choice. If you know that the panel is going to operate close to its 100A rating, then I would go larger than that. The minimum wire size you can run to a 100A panel is #4 copper or #2 aluminum. What size wire & type would i need to run 100 amp to pole barn approx.
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