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Because they are "in-phase". In order to get 240v, you need two 120v Alternating Current lines that are 180° out of phase, that is, opposite phases. Only when one line is +120v and the other -120v will you see 240v between the wires.

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Q: Why are you not getting 240v between the two hot wires?
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Related questions

Can you use one wire from the panel with 240v on it to wire a 240v water heater?

In North America it takes two "hot" wires to obtain 240 volts.


Can you join red and black wires to get 240V?

No, joining a red and black wire together will not give you 240V. To obtain 240V, you typically need to connect two hot wires (black and red) and a neutral wire. It is crucial to follow proper electrical codes and guidelines to ensure safety.


When connecting a 240V line with two hot wires and a ground does it make a difference if the red or black hot wires are connected to L1 or L2 for a jet pump pressure switch?

No, it does not matter which hot wire (red or black) is connected to L1 or L2 for a jet pump pressure switch in a 240V setup. The important thing is to ensure that each hot wire is connected to one of the two load terminals of the pressure switch. Make sure to also connect the ground wire for safety.


What if your electrician has fitted a 240v socket in your rec room you want to use your 240v deck and amp but find 2 hot 120v wires and 1 earth How can you use your prized stereo?

Not a hard job or complicated but could be hazardous. Hire a professional.


Would the black wire be line 1 on 240V line in?

No, the black wire is typically associated with line 2 in a 240V line. In a 240V circuit, there are two hot wires - line 1 (black) and line 2 (red), as well as a ground wire and sometimes a neutral wire.


How do you hook up a 3 wire water herter to 4 wire circut?

4 wire household wiring is black, red, (hot wires) white (neutral) and bare or green (ground wire). You say 3 wires. Is it 120v or 240v. If its 240v which is more common just use the two hots and the ground and cap off the neutral wire.


Why does your car speakers sometimes stop working when it is really hot outside?

The wires are probably getting too hot.


Originally a 240V line running from the 50A circuit to a box contaning in line fuses from this box came a 240V cable having 2 black wires and wire braid do I wire the outlet stove as a 3 or 4 prong?

Based on the description, it sounds like you should wire the stove outlet as a 3-prong outlet since the cable you have appears to have two hot wires and a ground wire (wire braid). Connect the two black wires to the hot terminals and the wire braid to the ground terminal on the stove outlet. Remember to ensure that the circuit is properly grounded for safety.


How a 240 V GFCI breaker works without a neutral ran to the equipment?

A 240V GFCI breaker monitors the difference in current between the hot wires, providing ground-fault protection without needing a neutral wire. It compares the current on both hot wires and trips if an imbalance is detected, indicating a ground fault. This system does not rely on a neutral wire to detect faults and protect against electrical shocks.


How can you connect a system working with 60Hz 1 Hot wire 1 neutral wire and a ground wire to my utility system that works with 60Hz two hot wires and a neutral wire?

Your 2-wire system is actually connected to one "side" of the 3-wire system. In your utility's 3-wire system you have 2 hot wires that are attached to each end of a tranformer winding and the neutral is attached in the middle and grounded. Typically in the US this gives you 240v (or something similar) between hot leads and 120v from each hot lead to neutral or ground.


Why 4 wires for dryer?

A dryer needs four wires for proper operation and safety because it requires two hot wires, one neutral wire, and one ground wire. The ground wire helps protect against electrical shocks and ensures proper functioning of the appliance. It is a standard requirement to have all four wires for dryer installations to meet safety regulations.


If you have a spa that is 240V with 4 wires can you hook an extension cord from a 240V welder to it to see if it works if the cord only has three wires?

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