The Internet has many places to ask questions about anything imaginable and find past answers on almost everything.

## How many #12 wires are in a 4 square deep box?

Table 314.16(A) permits a maximum of nine 12 AWG conductors in a 4-inch square box that is 1 1/2 inches deep.

## How do you calculate electrical box fill?

Step 1: Determine the number of each size conductor. All equipment-grounding conductors count as one conductor, based on the largest equipment-grounding conductor entering the box [314.16(B)(5)]. Step 2: Determine the volume of the conductors [Table 314.16(B)]. Step 3: Select the outlet box from Table 314.16(A).

2 x 3 inches

## Can two separate circuits be in the same junction box?

Re: Two circuits in the same box (outlet/switch) Other than that you can have as many circuits as you have devices in the box, as long as you have adequate room in the box for splices and connections.

## Can you run 2 circuits in conduit?

Actually, you can have more than one circuit feeding an outbuilding if it has different purposes or operating restrictions; or it has different voltages; and several other exceptions described in NEC 225.30. (however your inspector may say it counts as a 120V circuit, so it’ll be your only one if so.)

## Can I run 2 circuits in the same conduit?

1. You can share a single ground but it must be sized for the largest circuit running in the conduit. 2. Yes it is ok.

## Can 2 separate circuits share a neutral?

It is NOT permitted to share a neutral in any other situation. If you were to share a neutral with two breakers on the same leg of a panel, both circuits could draw the breaker limit (lets say 15A) making the shared neutral as much as 30A return current!

## Can 2 20 amp circuits share a neutral?

In residential, standard receptacles and lighting circuits are all 20A so that’s why you can share a neutral between two circuits and now more. If you had a 20A load on two circuits (each connected to a different phase), the load on the neutral would be 0A. They cancel each other out.

## Can 2 circuits share a ground?

Essentially, within the NEC 2014 code, you can connect multiple circuits to the same ground as long as the circuits are all on the same bus and originate within the same circuit box or enclosure.

## How many circuits can share a neutral?

You can only have one neutral per circuit in a single phase system, it is a current carrying conductor. If you use one neutral with two circuits you can exceed the capacity of the conductor and damage the conductor.

## Can you use 2 wires 3 wires?

Three-wire Romex can be used to power two separate circuits that share the neutral. For example, here the black wire feeds a receptacle circuit, while the red feeds a lighting circuit. Although multiwire branch circuits are permitted by code in certain cases, the author doesn’t recommend them for residential wiring.

## Why is there no neutral on 220v?

220 doesn’t ‘need’ neutral because each pulse uses the off phase of the other side for this purpose and AC back and forth but where is the circuit since the power is only looping back to the hot bars. (bear with my lack of technical jargon) …then if the earth ground becomes broken there is no circuit at all.

## Can you connect 2 hot wires together?

Essentially, putting two hot wires together isn’t really a good idea, since there will either be no voltage difference or you may end up with a short or dead. This would most likely result in a short circuit, dysfunctional results, would trip one or more circuits, or have more misfortunate outcomes.

## What happens if you touch two hot wires together?

A short circuit happens when a “hot” wire (black) touches another hot wire or touches a “neutral” wire (white) in one of your outlets. When these two wires touch, a large amount of current flows, creating more heat than the circuit can handle, so it shuts off.

## What happens if 2 phases touch?

If two phase wires touch each other it is considered as a fault, the great Line to Line fault . This causes huge current to flow. If the circuit breaker is operative it will trip if it doesn’t there will be huge heat causing fire or melting of the wire.

## What happens when two phases are shorted?

In mains circuits, short circuits may occur between two phases, between a phase and neutral or between a phase and earth (ground). Such short circuits are likely to result in a very high current and therefore quickly trigger an overcurrent protection device.

## What is difference between 3 phase and 2 phase?

Three-phase electric power requires less conductor mass for the same voltage and overall power, compared with a two-phase four-wire circuit of the same carrying capacity. It has replaced two-phase power for commercial distribution of electrical energy, but two-phase circuits are still found in certain control systems.

## What happens if you cross live and neutral wires?

What happens when Live touches neutral? The live wire touches the neutral wire. – This will create a short circuit as a large current which exceeds the fuse rating will from the live (240 V) to the neutral wire (0V) as that path has very low resistance. The fuse will blow.

## What happens if you connect wrong wires?

But here’s the catch: If you connect the circuit wires to the wrong terminals on an outlet, the outlet will still work but the polarity will be backward. When this happens, a lamp, for example, will have its bulb socket sleeve energized rather than the little tab inside the socket.

## Will reverse polarity trip a breaker?

Yes, reverse polarity can both trip the breaker and cause electrical shock. This is much more common with newer equipment as well. Here’s why: In the newer equipment, the connectors are often wired to the neutral wire.

## Can reverse polarity damage an alternator?

The alternator diodes would not like being connected in reverse, and maybe cause the diodes to fail. This could result in heat and damage to the alternator. Attempting to start the engine should make no difference, the damage would be done as soon as the reverse battery connection was made.

## What happens if you connect the negative terminal first?

If you first connect the negative cable, then when you connect the positive cable there is a chance the wrench will complete a circuit between the battery and the chassis of the car. If the battery is offgassing, the spark could ignite those gases causing an explosion.

## What happens if you connect positive to negative on a battery?

Connecting the positive terminal of each battery to the negative terminal of the other battery will result in a huge surge of electrical current between the two batteries. The heat can melt internal and external battery parts, while the pressure from the hydrogen gas can crack the battery casing.