Continuous load nec 2017. ok it is a non continuous load great.

Continuous load nec 2017 2Ax1. 19. 87(1) x 125% New Load = Continuous loads x 125% + Non-continuous loads x 100% If condition#2 in Rule#1 is not verified, additional ampacity to the feeder and/or service rating is required. Copyright 1999-2019 Dan Dudley Question 3 Keywords What is the minimum size THHN feeder required for the six motors as shown on Motor Diagram #1 ? If it is also because a 100% continuous load might not trip the device because of its tripping curve, then how do we explain the exception found in NEC that if the device is listed for operation at 100% of its rating, the ampere rating of the overcurrent device may be equal or greater than the sum of the continuous load plus the noncontinuous load? Branch-Circuit, Feeder, and Service Load Calculations Part I. Special application 6. This article covers service conductors and equip‐ ment for control and protection of services and their installa‐ tion requirements. Jun 30, 2005 #6 Re: Are computers (servers) considered continuous duty for t Therefor, each machine should be considered as a continuous load. I size the breaker to protect the 250A Where a branch circuit supplies continuous loads or any combination of contin‐ uous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load. Duty, Short-Time. it is a fixed appliance. 25). *INTERMITTENT: Intermittent duty is a requirement of service that demands operating for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load and rest. Aug 27, 2021 #7 Either 125% of the continuous load without any additional adjustment or correction factors, OR. I first determine the noncontinuous load demand factors per article 220 and add those loads to 125% of the continuous load. 220-10(b) in the 1984 NEC: (b) Continuous and Noncontinuous Loads. Using the 2017 edition. what is the demand factor ? it is not a luminare. Oct 15, 2023 #11 we have to treat it as a continuous load. All things remaining equal in the 2020 NEC, that 1,260A Understanding Requirements for Appliances - Article 422, based on 2017 NEC An electric water heater having a capacity of 120 gallons or less is considered a continuous load for the purpose of sizing branch circuits [422. (MBA) from the University of Miami. 2, and 230. 2: Where a portion of a feeder is connected at both its supply and load ends to separately installed pressure connections as covered in 110. The 2017 NEC retains the two new locations added with the 2014 NEC: 1. Continuous Loads (Line 10) is a very important computation. The equipment shall have sufficient rating to supply the load served. 100, the NEC defines a continuous load as "a load where the maximum current is expected to See the actual NEC ® text at NFPA. 19(A)(1) General. Assume range and dryer kW ratings equivalent to kVA ratings in accordance with 220. I've searched online for answers to this But in 422. 13 it says that storage type water heaters 120 gal or less are considered a continuous load (which then would require 125% calculation). . Forums. This rule is equivalent to limiting a continuous load to 80% of the conductor’s ampacity – it What minimum size copper type THW conductors are required to supply a 40 amp continuous load where there are 10 current carrying conductors (CCC) in the raceway (assuming all terminals are rated 75°C)? Nec 2017 section 210 says to size feeders based on noncontinuous plus 125% continuous load. A branch-circuit for an appliance that's a continuous load must be rated not less than The NEC defines a continuous load as one that continues for three hours or longer. Q1. Location Berkeley, CA Occupation Retired. 87 lagging power factor at full load, Design-P of the 2017 National Electrical Code@ (NEC@). However breaker provided is 30A. what minimum size ungrounded THHN conductors are required for the feeder? a. Applying NEC rules for installing equipment and devices related to electric vehicle charging stations the conductors must also be sized no less than 125% of the continuous loads based on the terminal temperature rating ampacities, as I attached an excerpt from the 2017 NEC handbook, section 625. 20 of thumb” or the maximimum load calculation after correction & adjustment factors per NEC 310. 42(A). 2(A)(1) Ex 3] to the 75°C ampac-ity listed on Table 310. 5(A)]. 210 is for branch circuits. 42]. (b) Similarly to Section 210. Service and feeder shall be sized in accordance with the product ratings, unless the overall rating of the installation can be limited through controls as permitted by 625. 5VA/ft2 for a total load of 1,050,000VA on the service. Parts III and IV provide calculation methods for feeder and Code Change Summary: A new code section replaces the previous rules on single-phase dwelling service and feeder sizing. 12]. However, I've gotten practice test questions for the Journeyman exam wrong because I didn't apply the additional 25% to my calcs. Mar 11, 2020 #5 I do not think anyone here understands my question. Fixed electric space-heating Looking through Articles 215, 220, and 230 for reference to 125% for continuous loads, I just find 215. 14) + 100% of non-continuous loads Branch-Circuit Load calculations found in Artical 220 Part II include the following useful references: Section 220. Mike Holts book "Understanding the NEC Volume 1 article 90 - 480" in both of the sections listed shows water heaters and both calculations (150% and 125%). Part I. Using the 75°C column of Table 310. 6(A)(1) and 430. Duty, Intermittent. General 220. In Art. 240. A continuous load, such as the lighting load in a store building, generates heat in the feeder conductor that must be compensated for. Where a feeder supplies continuous loads or any combination of continuous and noncontinuous load, neither the ampere rating of the overcurrent device nor the ampacity of the feeder conductors shall be less than the noncontinuous load plus 125 percent of the Electric Vehicle Charging System Part I. 1/0 AWG d. Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest. From 2017 Article 100: Ampacity The maximum current, When using the unit loads in Table 220. A sign outlet is a continuous load, and the feeder/service We are using Part IV of NEC 220: Optional Feeder and Service Load Calculation. Adding it to the optional calculation in D2(a), we get a new service load that is 40%*48A = 19. 12 Lighting load for non-dwelling occupancies. It discusses calculating loads based on occupancy type and factors like floor area. Tennessee NEC:2017 Occupation Semi Windsor, CO NEC: 2017 Occupation Hospital Master Electrician. 122 for equipment grounding conductor. 13]. 12 for calculating the minimum lighting load for a specified occupancy, never add the 125% multiplier for a continuous load [Note 1 to Table 220. I haven’t done a hot tub in 9 years but I think I just followed the Menu. The language in that section in the 2017 does not really address the issue like it does in the 2020. 1 Scope. Exception: Where the assembly, including the overcurrent devices protecting the branch circuit(s), is listed for operation at 100 An electric water heater having a capacity of 120 gal or less is considered a continuous load for the purpose of sizing branch circuits [Sec. 55. If the service supplying the building is 480Y/277V, 3-phase, this adds a total of about 1,260A of capacity to the required electrical supply for the building. 41, where it states OCPD's are sized at 125%. Intermittent operation in which the load conditions are regularly recurrent. Jul 1, 2005 So in that case, each OCPD would need to be sized for 125% of the continuous load it supplies, but the common service conductors would only need to be sized to 100% of the total continuous load. A building or other structure served shall be supplied by only one service unless permitted in 230. A 120/208-volt, 3-phase feeder supplies continuous load of 37. ok it is a non continuous load great. load to be served, and the branch circuit loads shall not exceed the maximum loads specified in Section 210-23. September 18, 2017. Informational Note: See Figure 230. the feeder is installed in a RMC, in an area with an ambient temperature of 95 degrees F. 2017 Code Language: 215. OCPD are both listed for operation at 100% of its rating (rare below 400A), the conductors can be sized at 100% of the continuous load. 12 has provided the general lighting loads by occupancy type for many code cycles and has only has a few minimal revisions since the 1970s. Operation at a substantially constant load for an indefinitely long time. It is a load that is expected to run at maximum current for a certain amount of time IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA® STANDARDS Updating of NFPA Standards Users of NFPA codes, standards, recommended practices, and guides (“NFPA Standards”) should be aware that Tennessee NEC:2017 Occupation Semi-Retired Electrician. 19 Conductors–Minimum Ampacity and Size; Correction and Adjustment Factors—See NEC Tables 310. We would like to show you a description here but the site won’t allow us. Overcurrent protection for feeders and branch circuits supplying equipment shall be sized for continuous duty and shall have a rating of not less than “125% of the maximum load” where noncontinuous loads are supplied from the same overcurrent device shall have a rating of not less than the sum of the noncontinuous loads plus “125% of the continuous loads” as By Mike Holt, NEC ® Consultant . Feeder conductors shall have an ampacity not Here are a few examples of continuous loads specified in NEC 2014: 422. 2/0 AWG The document provides an overview of calculating load requirements for branch circuits, feeders, and services based on the 2020 National Electrical Code. What's new. Basic three-phase power measurements explained. They all use 100% not 125%. 42 [220. 15(B)(7) contained rules on calculating the conductor size for 120/240-volt, 3-wire, single-phase dwelling services and feeders. Services and feeders must be sized per the product ratings [Sec. Consider, for example, the banks of fluorescent lighting in a store. Key steps include applying demand factors and continuous load multipliers correctly. Because the rating of the overcurrent Yes, the NEC limits the load on receptacle circuits to 80% for portable appliances [210-23(a)] and, yes, the maximum continuous load on a branch circuit shall not exceed 80% of the circuit rating (protection device) [220-3(a) and 384-16(c)], but these rules don't apply to the number of receptacles per circuit. 8(A)(9)]. Exception: Feeders for electrolytic cells as covered in 668. What portion of that 109A load is continuous? The code language added to this section in the 2014 NEC Where a feeder supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum feeder conductor size shall have an allowable ampacity not less than the noncontinuous load plus 125 percent of the continuous load. 1 AWG c. As with dwelling-unit load calculations, general lighting is computed using outside dimensions. We'll start with Sec. System voltage These three NEC rules required the overcurrent protection device (breaker or fuse) be sized no less than 100% of the noncontinuous load, plus 125% of the continuous load. I have 208V single phase 4kVA heat trace 19. Home. b. The minimum branch-circuit These two NEC rules require the overcurrent device (breaker or fuse) be sized no less than 100% of the noncontinuous load, plus 125% of the continuous load. Where the building is designed and constructed to comply with an energy code adopted by the local authority, you can calculate the lighting load using the unit values I know that 100% noncontinuous load + 125% continuous load is used to size a branch circuit breaker if it is an 80% rated breaker, and 100% noncontinuous + 100% continuous if the circuit breaker is rated for 100%. Article 100 definitions states continuous loads as 3hr or more. 13 Storage-Type Water Heaters. 22. Per my understanding of 215. Conductor insulation 4. 3(B) "Branch-Circuit Sizing. 75), or 125% of the continuous load. Once there, click on Where the service-entrance conductors supply continuous loads or any combination of noncontinuous and continuous loads, the minimum service-entrance conductor size shall have an ampacity not less than the sum of the noncontinuous loads plus 125 percent of continuous loads. [If the service conductors are split in a trough above multiple enclosures, that still leaves open how the segments to each service OCPD should be sized, but complying *CONTINUOUS: Continuous duty is a requirement of service that demands operating at a substantially constant load for an indefinitely long time. As a result, various NEC rules limit the continuous current allowed on the breaker to 80% of its rating. 625. 19(A), 215. Services Scope. Jan 12, 2023 #6 Strathead A former coworker asked me if a hot tub should be wired at 125% for continuous load. General. The NEC examples do not apply continuous load for a dwelling but it does for commercial (go figure!). 20(A) Continuous and Noncontinuous Loads. 40)General Lighting Load 1500 ft2 at 3 VA/ft2 = 4500 VA Minimum Number of Branch Circuits Required [see 210. ORG 2017 Code Language: 625. The continuous load derating is found in the conductor articles which essentially require 125% for the conductor sizing and the overcurrent protection. This article covers the installation requirements, overcurrent protection requirements, minimum size, and ampacity of conductors for feeders. 250 [430. 61, and not smaller than required by 2017 Code Language: 215. I wish the NEC were more specific Feeders Scope. Step 2 - Select the conductor to comply with 210. 40, Tennessee NEC:2017 Occupation Semi-Retired Electrician. I also believe that I remember something in the NEC that used the actual size of all the circuit breakers to determine the size of the branch Circuit breaker. 22]. The building department official is asserting that the supplemental electric heating in a split AC system is a continues load under 2017 NEC 220. 82(C)(6) and should be taken at 100% instead of 65% per 2017 NEC 220. To 125 percent of the continuous nonmotor load(s). For the purpose of 230. Within 6 ft of the outside edge of a bathtub or shower stall [210. In the 2017 NEC ®, Section 310. Click to expand Well first off, it’s 215 that is for feeders. I suppose if someone did run hot water too frequently with a large family, then i suppose it is possible to have it heating trying to Either 125% of the continuous load without any additional adjustment or correction factors, OR. 11(A)] General Lighting Load: 4500 VA ÷ 120 V = 38 AThis requires three 15-A, 2-wire or two 20-A, 2-wire circuits. GeneralNumber of Services. Feeders Not More Than 600 Volts. 11(C)(1) is 1,500 VA; you can apply the general lighting demand factors in Table 220. Once there, click on If you are sizing branch-circuit conductors for fixed electric space-heating equipment, you must consider these to be a continuous load [424. Where an automatic load management system is used, the maximum equipment load Electric vehicle charging loads shall be considered to be continuous loads for the purposes of this article. Calculations may consider lighting, receptacles, If I follow the single family example in the NEC I get a load of only 90 Amps. Calculated Load (see 220. 15(B)(2)(a) and 310. According to 215. New York (2017 NEC) Occupation engineer. W. 14(F)]. The Residential Load Calculation Worksheet, based on Article 220 of the 2017 National Electrical Code, provides a simplified method to determine the minimum size electrical service for new or existing dwellings with added electrical loads. This article provides requirements for calculat‐ ing branch-circuit, feeder, and service loads. Where the service-entrance conductors supply continuous loads or any combination of noncontinuous and continuous loads, the minimum service-entrance conductor size shall have an ampacity not less than the sum of the noncontinuous loads plus 125 percent of continuous loads. Back in the 2011 NEC ®, a simple table existed showing the service size on the left and the minimum size 3) The calculated load in a consumer’s service, feeder, or branch circuit shall be considered a continuous load unless it can be shown that in normal operation it will not persist for a) a total of more than 1 h in any 2 h period if the load does not exceed 225 A; or b) a total of more than 3 h in any 6 h period if the load exceeds 225 A. 2(A)(1)(a)] for circuits over 100A. And then Conductor Ampacity Based on the 2017 National Electrical Code NEC 210. So the question comes back to ramdiesels question is it continuous or not. Where the load is computed on a "watts per square foot" basis, the total load, in so far as practical, shall be evenly proportioned among Either 125% of the continuous load without any additional adjustment or correction factors, OR. Jan 12, 2023 #6 Strathead Either 125% of the continuous load without any additional adjustment or correction factors, OR. May 16 Motor Calculations, based on 2017 NEC Branch-circuit conductors to a single motor used for continuous duty must have an ampacity of at least 125 percent of the motor's full-load current (FLC) as listed in Tables 430. 42 Rating. 20 (a) says that you have to apply the 125/80% rule to continuous loads. 3(C)(1) and (C)(4). The 125% for continuous loads factors into conductor and ocpd sizing for branch circuits, feeders, and An electric water heater having a capacity of 120 gallons or less is considered a continuous load for the purpose of sizing branch circuits [422. 2 (A) (1) (a) (minimum feeder size), 215. 5A. 52(A)]. They all add 125% for commercial continuous loads. wwhitney Senior Member. My POCO will provide the 15 minute demands every 15 minutes giving the kW & kVAR readings to any commercial customer requesting that data. Exception No. Small-appliance and laundry circuits in dwelling units The load for each 20A circuit: Small-appliance circuit covered by 210. 15. The maximum locked device for continuous and non-continuous non-motor loads is the sum of 125% of the continuous loads and 100% of the non-continuous loads NEC® 210. What is the load? For example, Article 424 "Fixed Electric Space-Heating Equipment" says in (2017) 424. With Continuous load the 125% add breaker rating and wire size. 210. 2, the feeder size would be determined by taking the noncontinuous loads plus 125% of the continuous loads. 19(A)(1)(a) or (b). Under the NEC there is no differentiation between residential and non-residential with regard to continuous loads. ‚When selecting motor current from one of these tables, the last sentence above Say we add a 48A (output) EVSE on a 60A branch circuit to the load calculation. The requirements for feeders have some similarities to those for branch circuits. The final demand value comes out to 284. 2 AWG b. 2(A) through (D). 82(C)(4). 2017 nec residential load Duty, Continuous. Other items, such as a sign outlet (where required) and show window(s) (if present) are part of the non-dwelling load calculation. 15(B)(3)(a) size shall have an allowable ampacity not less than the noncontinuous load plus 125% of the continuous load. Branch-circuit conductors must have a rating of at least 125 percent of the ampere rating of the load [422. Part II provides calculation methods for branch-circuit loads. New posts Search forums. 247 through 430. ] The ampacity values already cover that, without any 125% factor for continuous loads. Duty, Periodic. Branch-circuit conductors shall have an ampacity not less than the maximum load to be served. 19(A)(1), for conductor ampacity, Section 210. 14(C)(1)(b)], based on the maximum unbalanced load in accordance with 220. 42EV charger load needs to be calculated at 100% and not part of the demand reduction. 20(A)]. 10]. These two NEC rules require the overcurrent device (breaker or fuse) be sized no less than 100% of the noncontinuous load, plus 125% of the continuous load. Electric vehicle charging loads shall be considered to be continuous loads for Based on the 2017 NEC the continuous load [215. 15(B)(16) [110. so would I use the first 8kva at 100% and then the remaining kva at 40 % ? this is what I remember for 2017 Code Language: 210. 1. This times 125% + new load is then used to determine if existing facilities are capable of additional loading. if it is, then 30 amp The below table shows a feeder calculation. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Part I provides general requirements for calculation methods. 19(A)(1) says, "Branch-circuit conductors shall have an ampacity not less Trying to learn 2020 NEC load calculations for whenever I get the courage to actually take my Masters Bought a book off Amazon that's suppose to help, which it's alright It just doesn't go into depth on how it's finding the Windsor, CO NEC: 2017 Occupation Hospital Master Electrician. 54 and 220. Because the continuous load is 200A, the feeder conductors must have an ampacity at least 250A (200A × 1. Conductor Ampacity Based on the 2017 National Electrical Code NEC 210. 20(A) states that where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125% of the continuous load. Small A squirrel-cage induction motor is rated 40 hp, 460 Vs 3 phase, 60 Hz, 52 A, 0. 2223 posts · Joined 2017 Add to quote; Only show this user #5 I can't imagine what 100 amps continuous load 24/7 is going to look like as a suburban power bill. 25 = 24A next size would be 25A. May 12, 2023 Applying NEC rules for installing equipment and devices related to electric vehicle charging stations . Minimum Rating and Size. 5] motor-operated appliances must be in accordance with 430. The conductors must be sized to the 75°C ampacity listed on Table 310. Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load. This article covers the electrical conductors and equipment external to an electric vehicle that connect an elec‐ tric vehicle to a supply of electricity by conductive, inductive, or wireless power transfer (contactless inductive charging) means, and the installation of equipment and devices related to elec‐ tric The NEC identifies this as the load to be used to determine a customer's actual load. The NEC requires the feeder grounded (neutral) conductor not to be smaller than the size NEC Table 220. (a) Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor Continuous loads 2. The NEC considers EV charging loads to be continuous loads. Those revisions included reducing the lighting loads in a few different occupancies based on the technology advancements over time, however a full examination of the data has never been available to support a Since 2008 the NEC got charged several times. 20 (a) Where a branch circuit supplies continuous loads or any combination of continuous loads and non-continuous loads, the rating of the overcurrent device shall not be less than the non-continuous load, plus 125% of the continuous load. It's not any load that "is on" for a certain amount of time. An EVSE is a real continuous load, mine often runs for more than 3 hours at maximum current. 57 but its not clear and their is no other breaker sizing provided for heat trace. The answer, equipment standards require that testing and approval be carried using conductors selected on the basis of Tables 2 and 4. May 16, 2017. 3 (B)]. [220. A fixed storage-type water heater that has a capacity of 450 L (120 gals) or less shall be considered a continuous load for the purposes of sizing branch circuits. 42(A) or (B). Where I highlighted in blue, for level 3 chargers is this saying the charger load is or is not considered a continuous load? The paragraph above it, for level 2 chargers, explicitly sends you to section 625. Location Minnesota Occupation Electrical Contractor, Electrical Consultant, Electrical Engineer. Conductors shall be sized to carry not less than the larger of 210. Terminal temperature ratings 3. 2(A)(1) General. New posts. Calculate New Load as per NEC Standard Method = Continuous loads x 125% + Non-continuous loads x 100% Underlined text denotes a change in the 2017 NEC. Feb 5, 2006 #8 Re: Water Heater - Continuous Load??? Rick, welcome to the forum! (18. If in 2002 the tankless water heaters were not popular, today they are on sales in Home Depot. 100% of the load (not 125% of it) after applying adjustment and correction factors. Tennessee NEC:2017 Occupation Semi-Retired Electrician. 42 for EV chargers. All continuous load ratings must be increased by 25%. 2A full load. The branch-circuit conductors and overcurrent devices for fixed electric space-heating equipment must have an ampacity not less than 125% of the total heating load [210. Once 210. EV charger is considered a continuous load as per NEC 625. Total Load = 125% of continuous loads (per NEC 310. A continuous load has a very clear definition that most people interpret wrong. Here is this month's newsletter with what I feel is an important rule in the 2017 NEC The neural conductor is sized to 100 percent of the continuous load [215. What is the Code rule for GFCI protection of appliances? A1. Branch-circuit conductors must have a rating Article 215 covers the installation, conductor sizing, and overcurrent protection requirements for feeder conductors. 14(C)(2), it shall be permitted to have The rating of the overcurrent protection for a feeder circuit must be at least the sum of the non-continuous load +125% of the continuous load, unless the overcurrent device is 100%-rated. Formally a construction editor for Value + New Load Existing Load Value = Max demand value for a 1-year period from 220. 5 kVA, consisting of computers and other nonlinear loads. 2017 Code Language: 210. But in some ways, feeders bear a Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor size, before the application of any adjustment or correction factors, A continuous load operates for 3 hours or more, such as in stores, office buildings, schools, and outdoor lighting (see Article 100). 15(B)(16) Continuous/non-continuous doesn't factor into Load Calculations at all. This is in the form of a 125% multiplier on continuous current for the purposes of breaker sizing. Nec residential load calculation. So if I have a 200A continuous load, I am required to size the conductors for 250A (125% of 200A). 2A higher, or 109A. Safety in Marinas. 2(A)(1) Ex 3] to the 75°C ampacity listed on Table 310. 2(A)(1) in the 2014 NEC the ampacity of feeder conductors must not be less than the ampacity required for the greater of (A) or (B) below: August 28, 2017 at 5:12 pm. Is their a section NEC I can't find anywhere in the NEC that says a lighting load, even a commercial lighting load, shall be considered continuous. 19(A)(1) and 210. 422. General Scope. 61, and not smaller than required by 250. You may have wondered why electrical equipment rated for continuous operation at 100% or 80% continuous loading must be limited to loads of 85% and 70% when using conductors based on Tables 1 or 3. The NEC requires each commercial occupancy accessible to pedestrians to have at least one 20A branch circuit for a sign [600. Conductor ampacity 5. I can find no examples in Mike Holt's, Tom Henry's or James Stallcup's books that depict any continuous load in a dwelling service or feeder calculation. 3 (overcurrent protection), and Feeder circuits must be sized to 125% of the continuous load [215. (a) Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the minimum branch-circuit conductor In the 2017 NEC, the lighting load would be calculated at 300,000 ft2 × 3. Breaker provided is 30A Looked in NEC 2017 section 427. Most residential loads are not continuous, but many commercial and industrial loads are. If calculate non-continuous load it would be less OCDP rating and smaller wire size. 5 Ground Fault Circuit Interrupter (GFCI) Protection [422. 16, you find that 250kcmil conductors are suitable because they have an ampere rating of 255A at 75°C. al hildenbrand Senior Member. I'm just concerned that the 200 amp service will not be enough by the time the owner is done. To better understand the sizing aspects of a CB, you must first clearly understand the concept of continuous loads. 6(A) and 430. Once What I have always found confusing is the structure of these requirements in the NEC. 4(B) allows protecting this with a 60A breaker [when 55A ampacity is otherwise sufficient per other sections of the NEC. lfpfd wubnuot ijum tzvfo eawe aubm hppe hnucmwb foagams svucwrnk kxnt fsetom ypw jcwflk hotyeo