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What size aluminum electric wire do I need for 90 amp service , under ground wire?

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Number 2 alu it is good for 90 amps

Posted on Sep 30, 2010


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What size wire is needed for 100 amp, under ground service

It depends on the regulations of your district, and the line voltage, AC or DC.

Just as an example only, it may possibly be 3 x #4 conductors for the service wires, and a #5 ground conductor. But you need to check with the authority.

Mar 01, 2017 | Car Audio & Video

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Can i use 3 ott 4 wire mc for a 200 amp service indoors

No problem but you can use a smaller diameter wire either copper or aluminum to support a 200 amp entrance. I have included a few links to help. Typically aluminum wire is a gauge larger (lower number) then Copper.

Thread What wire type is acceptable by NEC Code For Service Entrance

Can use 3 ott 4 wire mc for 200 amp service indoors

What size wire is required for 200 amp service

What is the wire size for 200 amp service

Dec 08, 2016 | Electrical Supplies

1 Answer

What size wire and how does it hook to thr unit rpkb-036jaz

Look at rating plate on side of unit for Volts, Amps, Watts.
Volts x amps = watts.
If unit is 240Volts, then you need double-pole 240Volt breaker
If unit is 8500 watts at max power, then 8500 watts divided by 240Volts = 35 amps.

What size breaker for 35 amps?
When electricians figure load rating for breakers, they use the 80% rule.
40 amp breaker x 80% = 32 amp safe maximum load for 40 amp breaker. Use 8 gauge wire with 40 amp breaker.
50 amp breaker x 80% = 40 amp safe maximum for 50 amp breaker. I use 6 gauge wire with 50 amp breaker.
60 amp breaker x 80% = 48 amp safe maximum for 60 amp breaker. Again, use 6 gauge wire with 60 amp breaker.

How to connect wires to unit.
First of all, all outdoor HVAC units require power cut off located next to unit.
This lets the mechanic, or service tech turn power off to work on unit, even if the mechanic does not have access to main breaker box.

Next, open unit to see where wires connect.
If unit has wires, then connect both hot wires from 240 breaker to the wires inside unit. Connect bare ground wire to green ground screw.
If unit has terminals. The terminals will be labeled L1 L2. Connect each hot wire from 240Volt breaker to either one of the screw terminals. Then bare ground goes to green ground screw.

Copy following links for basic illustrations connecting wires to terminals, and to breakers, and selecting wire size.

Jul 21, 2012 | Rheem R-410A Complete Split System Heat...

1 Answer

Electrical ground issue

Rebar in the ground may be okay for lightning protection but a big no no for electrical work. Rust on the rebar and lack of moisture in the ground (along with other factors) could make for a high resistance, useless, dangerous ground. A good ground has almost zero resistance. If parts of your body have a lower electrical resistance than your rebar setup, YOU will be the conductor! ZZZZZTTT!!!

May 06, 2012 | Heating & Cooling

1 Answer

What size breaker do i need for a whirlpool gold 465 electric range

A range that is under 12 kilowatts can be fed with 8-3 with ground cable and a 40 amp two pole breaker .. BUT .. that does not anticipate that the next range might be larger, SO I would use a 6-3 with ground cable and a two pole 50 amp breaker. The extra expence of the wire now is nothing compared to the expense of replacing it later.
Either installation would be using the same 50 amp 4 wire range receptacle.

Please vote !

May 12, 2010 | Whirlpool GR460 Electric Kitchen Range

1 Answer

Looks like our church just received the Vulcan VC4ED convection oven - 208 volts 60 amp. We have the 60 amp breaker but what gauge wire from the breaker to the oven do you recommend? I have to run about 35...

use 3 -- 6 gauge copper wires, you could get by with 2--6 gauge wires for the two hot phases and 1--8 gauge for the neutral connection,but with that long a run use all 6 gauge so you don't experience any voltage drop,also in your community you may need to check the local codes on grounding and need to add a separate grounding wire,which you can use an 8 gauge for this wire connection, if you use aluminum wire(which I highly DO NOT reccomend) you will need to get one gauge larger as in 3--4 gauge aluminum to carry the same current as copper wire

Dec 08, 2009 | Vulcan VC4ED Electric Single Oven

1 Answer

I need to know the breaker size and wire gauge and number of wires needed for a bosch ae125 water heater

According to the user manual below, it's a 50 amp heater, therefore, you need 6 AWG electrical cable and a 50 amp double pole (220 volt) breaker in the main service panel.

You need two hot wires and a ground wire. The cable would be specified as 6/2 w/ ground. The 2 hot wires in the cable would be red & black or black & black -- these attach to L1 & L2 respectively. ( L = Line )

More info, let me know.


Oct 04, 2009 | Bosch PowerStar AE125 AE125 Whole House...

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I have a 200amp main with a 150amp sub panel and I'm not sure of the wire size I would need for an 80 foot run. With the multiple answers I got confused. I was told 2/3 w/ground, 2/0, 2awg or #2. Also, I...

All of the answers you got were all for the same product, it's just being said differently. 2/0 is the correct wire size. I think this question may be old, so you may have already completed your project. By the way, with copper, the voltage drop on an 80 ' run is 0.8 %. On aluminum it is 1.56%.

At any rate, a 150 amp sub-panel with 20 circuits running on a 200 main amp can easily be overloaded. You should probably have a 300 or 400 amp main with a subpanel that large.

May 13, 2009 | Electrical Supplies

1 Answer

Installing ge profile double oven not convection in new build trying to find out electrical requirements ( size breaker 50,60amp ?)

You must use a three-wire, single-phase A.C.
208Y/120 Volt or 240/120 Volt, 60 hertz
electrical system. If you connect to aluminum
wiring, properly installed connectors approved
for use with aluminum wiring must be used.

That means that you ned a double 40 amp breaker.

Good Luck

Jan 18, 2009 | GE Profile JT952 Electric Double Oven

1 Answer

Load calculation and size of wires

A lot of your questions also have distance that need to be factored in. Copper is way better than aluminum. but in large wires it may be too expensive, also some suppliers only carry aluminum in the largest sizes. If you are doing a lot of electrical, then you need to learn "ohms law." Also most appliances have the amp load printed on them on the I.D. label.

Mar 03, 2008 | Carrier 36KCARMS Air Conditioner

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