# What is more important for amperage rating wire size or insulation temperature rating?

Wire size determines how much current can be safely conducted. Insulation type and rating determines other factors, such as where the wire can be used and maximum voltage.

It should be noted that the high voltage lines that are hanging from the really large electrical towers are among a class of wires that have NO insulation around the outside of the wire. They are instead, connected to the towers with large insulators that prevent electrical energy from being lost through the towers.

### What is The amperage rating of 350 MCM copper wire?

It depends on a lot of factors. Generally speaking, if the insulation is THHN then the rating is 350 amps. If the insulation is THWN then the rating is 310 amps. The ampere rating for wire depends on the temperature of the environment it will be used in, the insulation rating and the number of circuits installed in a conduit. There are also other factors to consider... like voltage drop in long runs.

### Which unit describes the difference in conduction between the wires amps or volts?

In regards to the capacity of a conductor, the rating is in amperage. Voltage is an insulation factor which refers to the amount of voltage that can be applied to an insulated conductor before the insulation breaks down. A break down of insulation is the main factor of creating a short circuit condition.

### Can you use 600 volt 14 ga wire on an electric dryer?

The maximum amperage that can be applied to a #14 wire is 15 amps. The 600 volts is just an insulation rating. Check the nameplate on the dryer to see what the amperage and voltage the manufacturer recommends. If the nameplate just states a wattage use the following formula to find the amperage. Amps = Watts/ Volts.

### How many amps will 6 gauge wire carry?

A #6 AWG copper wire with 60 degree Celsius insulation rating can carry 55 amps, 75 degree Celsius insulation rating can carry 65 amps, and a 90 degree Celsius insulation rating can carry 75 amps. If it is aluminum or copper-clad aluminum the ampacity for the three temperature ratings would be 40, 50, and 60 respectively.

### Does a high rating mean lots of insulation or little insulation?

It depends what you mean by a 'high rating'! If you mean a high 'voltage rating' then, yes, you will require thicker insulation. But if you mean a high 'power rating', then, not necessarily, because the voltage can be low, while the current is high. Remember, the thickness of insulation depends on the voltage, while the type of insulation (how it withstands higher temperatures) depends on the current.

### What is the maximum temperature rating of a intimated conductor?

I have never heard of the electrical term intimated conductor. Conductors are rated on their insulation factor. The number that is stamped on the conductor's insulation is the maximum ambient temperature that the conductor can be submitted to. Most home building cables are rated at 75 and 90 degrees C.

### How do you calculate wire size needed for a 100 amp load?

A table in the electrical code book states what size cable or wire is allowed to carry a specific amperage. A #3 wire wire with an insulation rating of 75 or 90 degrees C is rated at 100 and 105 amps respectively. A #2 wire wire with an insulation rating of 60, 75 or 90 degrees C is rated at 100 ,115 and 120 amps respectively.

### How many amps is a 3 gauge copper wire rated for at 115 volts?

A #3 copper wire with an insulation rating of 90 degree C has the capacity to receive 105 amps. This is the most common or standard insulation that most calculations are based on. It is the insulation that governs the rating of the voltage. House wiring cables are insulation rated at 300 volts. Most other wiring insulation is rated at 600 volts. Special wires have a insulation factor of 1000 volts. The higher the insulation…

### How do you figure your celsius rating for wire sizing?

The ambient insulation rating of wires and cables is imprinted on the wire and cables. The labels on the cables will tell you the wire size, number of conductors and temperature rating of the wires and cables. The higher the cable and wire temperature ratings the higher the amount of current that is allowed to be drawn by the wire and cable according to the electrical code book.

### How many amps is Copper wire current rate?

The amperage rating of a copper wire is related to its resistance and to the type of insulation used (i.e., what temperature the insulation can handle) and the ambient temperature. The fatter the copper wire, the more amps it can handle, everything else being equal. A mineral-insulated wire, buried underground, would handle more amps than a similarly sized copper wire in thermoplastic insulation in air. There are electrician charts available to determine the MINIMUM size…

### What is the wire size for a 3 hp 240 v 1 phase motor?

Wire size is based on the amperage that the motor draws. Motors amperages vary within the same HP range. Without that an accurate answer can not be given. For calculation purposes the electrical code book uses 17 amps as a usable amperage. The book amperages are usually high as compared to the actual motor's full load amperage. A motor feeder has to be rated at 125% of the motors full load amperage. 17 x 125%…

### What size wire for parallel runs for 600 amps?

[From NEC 2012 310.15(B)(16)] For a 350 MCM copper wire with: an insulation factor of 75 and 90 degrees C; not more than 3 current-carrying conductors in Raceway, Cable, or Earth; and based upon ambient temperature of 30Â°C ; has an amperage rating of 310 and 350 amps respectively. As a rule of thumb, you could consider their rating to be double with two sets paralleled together for 620 or 700 respectively. Be sure to…

### How do you find wattage rating of a microwave oven?

Wattage = voltage x amperage. Every appliance in North America is built to work at 120 V, so you have the voltage. The amperage rating is probably written in the microwaves manual if the wattage is not. Remember the amperage you put on a circuit can't be more that 80% of what the wiring is rated for in the branch circuit.

### Why is it not okay to use a fuse with a higher amperage rating in an electrical circuit?

The fuse is supposed to be the weakest link in the circuit. The circuit is rated to handle a specific load current. The wire and insulation rating of the circuit is governed by this specific load. If this load malfunctions and the load current becomes higher that what is specified, the fuse is there to break the circuit. A fuse of a higher rating than what is called for will allow a higher current to…

### How do you calculate the required cable size for 100 hp 120 amp 3 phase 400 volts motor?

The required cable size is based on the amperage draw of the motor. The motor amperage stated is 120 amps. The electrical code states that the conductor capacity of a motor load has to be 125% of the motors full load amps. 120 x 125% = 150 amps. Form the electrical code book, a #1 wire with an insulation factor of 75 or 90 degrees C is rated at 130 and 140 amps respectively. The…

### What is the amperage limit for 8 gauge copper wire?

That depends on the wire's insulation and the temperature rating of the devices you're connecting it to. This type of question usually means you aren't ready to do this yourself. Study some electrical material and the National Electrical Code and work this answer out for yourself, or call a professional electrician. If I were to give you an answer, you might attempt to do something you shouldn't be doing, and that may cost someone a…

### What size of wire should you use to wire a 8 kw heat strip at 240 volts?

Wire sizes are based on amperage. To find the amperage of a 8 kW or 8000 watt strip heater the following formula is used. I = W/E. Amps = Watts/Volts, 8000/240 = 33 amps. Legally and the electrical code stated that conductors can only be loaded to 80% of their rated capacity. A #10 copper wire with an insulation rating of 90 degrees C is rated at 30 amps. A #8 copper wire with an…

### What is the max amps for a number 8 gauge wire?

A #8 copper conductor with an insulation factor of 60 degrees C is rated at 40 amps, insulation factor of 75 or 90 degrees C is rated at 45 amps. If the breakers rating is 90 degrees C then the amperage can be boosted for 60 degree wire to 40 amps, 75 degree C wire to 50 amps and 90 degree C wire to55 amps.