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#8. It is better to error on the next large size. # 8 THHN 90 degree wire is rated at 45 amps. If there is a possibility that the breaker is connected to a 50 amp load the wire will be undersized. A #6 wire is rated at 65 amps. For continuous use, a load factor of 80% has to be applied. 65 x .8 = 52 amps. The only time the conductor can be smaller than the breaker size is on a motor feeder. Then the breaker is sized at 250% of the nameplate full load amps (FLA) rating of the motor. This is to allow the motor's starting current, which is about 300% FLA, to not trip the breaker on start up.
What else can I help you with?
What is the recommended AC breaker size for a 240V air conditioning unit?
The recommended AC breaker size for a 240V air conditioning unit is typically 20 amps.
What is the breaker size for a 10 KVA electric heater?
The breaker size for a 10 KVA electric heater would depend on the voltage it operates at. For example, for a 240V heater, you would need a 41.67 Amp breaker (10,000 VA / 240V = 41.67 A). It is important to consult with a licensed electrician to ensure the correct breaker size and electrical setup for your specific heater.
Can you install a 240v outlet for a stick welder near your panel if it has slots available for a circuit breaker?
Simple answer is yes. But you need to first determine if your breaker can handle it, not just because you have an empty slot. You have to total up amps being used and check rating for your box. If it can handle it then it is a sinch to install
What size breaker is needed for a 20 kva heat strip?
To determine the appropriate breaker size for a 20 kVA heat strip, you need to calculate the current. For a 240V system, the current is approximately 83.3 amps (20,000 VA / 240V). It’s standard practice to use a breaker rated at 125% of the continuous load, so a 100-amp breaker would be suitable for this application, providing a safety margin. Always consult local electrical codes and a qualified electrician for compliance and safety.
What size breaker can you use on a 7500watt generator?
Depends on the wire size you are using. If the generator breaker is a 30 amp then install a 30 amp breaker.
What is breaker size for 240 volt 9 KW?
The formula you are looking for is I = W/E.
What amperage breaker to run 500 watt 240 volt heater?
To run a 500 watt 240 volt heater, you would need a 2.08 amp breaker. This can be calculated by dividing the wattage by the voltage (500W / 240V = 2.08A). You would typically round up to the nearest standard breaker size, which in this case would be a 3 amp breaker.
What size breaker do you need for 9000W at 440V 3 phase delta?
50amp but if considering the breaker cannot withstand starting current you need to size the breaker up.
What size wire do I need for a 30 amp breaker?
For a 30 amp breaker, you will need a wire that is at least 10 gauge in size.
What size circuit breaker for 240v 60hz garage heater?
The size of the circuit breaker for a 240V, 60Hz garage heater typically depends on the heater's wattage. A common rule of thumb is to choose a breaker rated at 125% of the heater's full load current. For example, if the heater is rated at 4,000 watts, the current draw would be approximately 16.7 amps, so a 20-amp circuit breaker would be appropriate. Always consult the manufacturer's specifications and local electrical codes for precise requirements.
What size breaker for a 8kw heat 7kw cool 240v ac?
P=VI here P=8000 Watts v=220 V I=8000/220 = 37 A so you should use 37A Breaker
What size wire and breaker for a 7.5 hp motor?
For a 7.5 hp motor operating at 240V, you would typically use a 14-gauge wire and a 40 amp breaker. However, it is best to consult the motor's specifications and the National Electrical Code to determine the exact wire size and breaker needed for your specific setup.
