80% breaker rating - what is at issue? | Information by Electrical ...

Mar 4, 2022 · The so called "80%" rule has to do with how they are USED. Circuit breakers protect conductors. For continuous loads, conductors must be sized to 125% of the max. load, …

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80% Breaker Rating - What Is At Issue? | Information By Electrical ...

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Mar 4, 2022 · The so called "80%" rule has to do with how they are USED. Circuit breakers protect conductors. For continuous loads, conductors must be sized to 125% of the max. load, …

mikeholt.com

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The 80% Rule And How It Is Applied To Circuits. - HomeOwnersHub

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Jan 11, 2017 · The 80% rule does not apply to breakers, It applies to the conductors and the breaker does not change that with the exception that in large conductors, the terminal rating …

homeownershub.com

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80% Breaker Rating Rule? | Information By Electrical Professionals …

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Sep 24, 2004 · Re: 80% Breaker Rating Rule? Personally, and please correct me if I'm wrong, I don't know why this 80% thing is an issue. Think about it, you have continuous and …

mikeholt.com

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80% Rule | Information By Electrical Professionals For Electrical ...

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Sep 23, 2020 · There is no such thing as an "80% rule" for circuit breakers, that's just a shorthand term we use because the real story is too difficult to explain quickly.ALL circuit breakers are …

mikeholt.com

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What Is The 80 Rule In Electrical?

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The 80% rule in electrical refers to a safety guideline that is commonly followed when determining the maximum load that can be placed on a circuit. This rule is particularly important when it …

h-o-m-e.org

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What Is The 80 Rule In Electrical? - Sage-Advices

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What is the 80 rule in electrical? This rule states that an OCPD can be loaded to only 80% of its rating for continuous loads. Remember that 80% is the inverse of 125% (0.80 = 1 [divided by] …

sage-advices.com

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Question About The 80% Rule : R/electricians - Reddit

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Welcome to /r/Electricians Reddit's International Electrical Worker Community aka The Great Reddit Council of Electricians Talk shop, show off pictures of your work, and ask code related …

reddit.com

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80% Vs. 100% Rated Breaker - Knowledgehub.eaton.com

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The 80% / 100% rule is reflected in the NEC codebook where specifically it states that unless the breaker is tested and labeled for use at 100% of its continuous current rating, it may have only …

eaton.com

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80% Rule | Information By Electrical Professionals For Electrical ...

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Jul 29, 2005 · Semi-Retired Electrical Engineer. Jul 29, 2005 #5 Re: 80% rule The purpose of the breaker is to protect the cable, not the load. If the load drew more current than the cable can …

mikeholt.com

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EV Home Charging Safety: What’s The NEC 80% Rule?

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Apr 7, 2023 · The NEC 80% rule stipulates that for EV charging, electrical circuits should not be continuously loaded to more than 80% of their maximum rated capacity. This means that for a …

cleantechnica.com

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80% Rule? - On ElectriciansForums

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Mar 17, 2015 · Find 80% rule? Advice and Help. How-to 80% rule? in the Electrical Wiring, Theories and Regulations advice boards on ElectriciansForums.net Est.2006 | Free Electrical …

electriciansforums.net

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What's The 80% Rule? - Carcharging.us

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The 80% rule is a requirement in the National Electric Code (NEC) mandating that any circuit that is used for a continuous load should be de-rated to 80% of its breaker rating. A charging EV …

carcharging.us

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Feeder Sizing (80% Rule) | Information By Electrical Professionals …

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Dec 13, 2024 · I'm reviewing the electrical code to teach other engineers the rules on feeder sizing and want to verify I'm still on the right track. It seems like there's still a lot of confusion …

mikeholt.com

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The 80% Rule: Why You Shouldn’t Charge Your EV To 100%

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4 days ago · The 80% rule is a charging practice recommended for electric vehicle (EV) owners to help preserve the longevity of their battery. Essentially, it suggests that you charge your EV …

citaevcharger.co.uk

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EV Home Charging Safety: What’s The NEC 80% Rule For EV

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This rule also applies to other amperage levels such as safe charging at 40 amps on a 50-amp rated circuit. Following your local electrical code guidelines, the NEC guidelines, and to the …

evchargen.com

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80% Rule Misapplied So Often. WHY? | Information By Electrical ...

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Mar 23, 2004 · Well the Chicago electrical inspectors seem to think residential loads are continous. And you can only load a device to 80% of its rating. Most residential electricians …

mikeholt.com

FAQs about 80% breaker rating - what is at issue? | Information by Electrical ... Coupon?

What is the 80% rule for circuit breakers?

The so called "80%" rule has to do with how they are USED. Circuit breakers protect conductors. For continuous loads, conductors must be sized to 125% of the max. load, so that means the conductors are never going to see more than 80% of the conductor rating (80% is the inverse of 125%). ...

What is the 80% rule?

The 80% rule says that no individual load shall exceed 80% of the branch circuit current rating. That reduces the probability of nuisance circuit breaker tripping. Nuisance tripping may tempt users to use extension cords on a continuous basis or otherwise engage in less safe usage practices. ...

What is the 80% breaker rating rule?

Unless otherwise marked, circuit breakers should not be loaded to exceed 80 percent of their current rating, where in normal operation the load will continue for 3 hours or more. Re: 80% Breaker Rating Rule? I was thinking more along the lines of a feeder breaker. But I see it's blatently obvious at 215.2 A 1. Seek and ye shall find! ...

What is the NEC 80% rule?

This rule also applies to other amperage levels such as safe charging at 40 amps on a 50 amp rated circuit. Following your local electrical code guidelines, the NEC guidelines, and to the NEC 80% rule helps maintain the safety, stability, and longevity of electrical circuits and equipment. ...

Do I have to apply the 125/80% rule?

However if you have a 100% rated breaker and panel, then you don't have to apply the rule. In that case, with a 100% rated breaker and panel you could have a 20 amp continuous load on a 20 amp breaker. In the above link, they quote the following exception to the 125/80% rule: ...

What is 80% rated breaker?

80% rule applies to continious loads such as motors, lighting or any load expected to be on 3 hours or more. A breaker is rated for 100% of the noncontinious load which may include outlets or other small appliances. There are fully rated breakers / panels that are rated for continious use And will be listed for this application. ...