80% rule? - Electrician Talk

Apr 1, 2014 · 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. ... Electrician Talk. 2.4M posts 100K members

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80% Rule? - Electrician Talk

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The 80% Continuous Rule. Can You Exceed It? | Electrician Talk

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Dec 19, 2013 · Bingo. Whenever you see a breaker rated for 100%, it will come with a footnote somewhere stating the enclosure requirements, often by saying that you can only use it as a …

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80% Rule For Hvac Units? - Electrician Talk

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May 8, 2010 · Electrical Trade Topics. NEC Code Forum. 80% rule for hvac units? Jump to Latest 31K views 59 replies ... Electrician Talk. 2.4M posts 100K members Since 2007 A forum …

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80% Values When And Why? - On ElectriciansForums

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Jan 18, 2017 · Electricians Arms Electrician Talk How to Access The Arms Domestic Electrician Industrial Electricians Wiring, ... The 80% "rule of thumb" applied to the Zs value is a safety …

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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 …

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

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Mar 4, 2022 · The standard breaker will not trip below 100% of its rating unless the temperature of the breaker exceeds 40°C. The 80% rule is just to account for the possibility of heat from other …

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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 …

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80% Vs 100% - Electrician Talk

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Mar 17, 2015 · (5) Where a fused switch or circuit breaker is marked for continuous operation at 80% of the ampere rating of its overcurrent devices, the continuous load as determined from …

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80% Rule? - On ElectriciansForums

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Mar 17, 2015 · Electricians Arms Electrician Talk How to Access The Arms Domestic Electrician Industrial Electricians Wiring, Theories, ... Reply to 80% rule? in the Electrical Wiring, Theories …

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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 …

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What Is The 80 Rule In Electrical?

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The 80% rule in electrical is a safety guideline that recommends limiting the load on a circuit to 80% of its capacity. This rule applies to various amperage levels, including EV charging. By …

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Motors And The 80% Rule - Electrician Talk

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Mar 6, 2018 · The 80% your talking about is covered in 8-104 and no, it does not apply to motors. Also It’s 80% of the overcurrent, not 80% of the wire. The fuse or breaker for a motor is quite …

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80% Rule - On ElectriciansForums

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Oct 10, 2009 · The majority of test result sheets have a column for the max tabulated Zs figures from BS7671 and a second column for measured Zs The 80% rule only applies to non …

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The 80% Continuous Rule. Can You Exceed It? - Electrician Talk

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Dec 9, 2012 · I don't think the 80% rule is part of the 489 standard. That really comes from various code rules. UL 489 requires that a breaker mounted in open air at an ambient of 40°C carry …

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80% Rule - On ElectriciansForums

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May 30, 2011 · Find 80% rule Advice and Help. How-to 80% rule in the Australia advice boards on ElectriciansForums.net Est.2006 | Free Electrical Advice Forum. 80% rule on …

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80% Rule? | Page 2 | Electrician Talk

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Jan 14, 2011 · 80% rule? Jump to Latest 21 - 31 of 31 Posts. 1 2. M. Meadow ... Electrician Talk. 2.4M posts 100K members Since 2007 A forum community dedicated to professional …

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

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Oct 20, 2021 · I have a 60kW diesel gen with a couple of 100amp outputs. My electrical 'go to guy' is saying that according to NEC the breaker for the 100amp connector needs to be …

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FAQs about 80% rule? - Electrician Talk Coupon?

Is there an 80% rule for a circuit breaker?

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 tested and listed to carry 100% of their rated load, but in "free air", meaning all sides of the breaker can dissipate heat (this becomes important later). ...

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: ...

Are circuit breakers rated at 80% current?

All breakers are tested and rated at 100% of their current, in free air at a maximum ambient of 40C (104F). The so called "80%" rule has to do with how they are USED. Circuit breakers protect conductors. ...

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. ...

What breaker is 80% rated with an 85A load?

W/regards to breaker operation, and for arguments' sake we'll use a 3-pole, 100A, 240VAC breaker that is 80% rated with an 85A load (continuous). What is the expected action that the breaker will take? Trip after 3-hours? Trip after 3+long hours? Keep on running with an 85A load 24/7? Terminal failure/thermal element failure? ...

How much receptacle equipment can be used on a branch circuit?

There is also 210.23 that says for fixed utilization equipment (i.e. dishwasher, etc.) on a circuit that also supplies lighting and receptacles, the equipment can't exceed 50% of the branch circuit rating. ...