A feeder is defined in the NEC as "All circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch circuit overcurrent device." Even the conductors for a circuit rated at 1000-amps is a branch circuit if the conductors are on the load side of the final branch circuit overcurrent device. 2011 Code Language: 210.19(A)(1) General. Section 230-2 limits the number of services to a building to one, but similar conditions to those in Section 225-30 exist that allow additional services. For a grounded electrical system supplied by a feeder or branch circuit, the equipment grounding conductor shall be sized in accordance with _____. Other references found elsewhere in the Code must be considered. by Mark Lamendola. a dedicated transfer switch With the 2014 Edition of the NEC, the requirements for masts are both spelled out better and broken out better. – KeithS Jul 29 '11 at 19:20 yellow All conductors of a(n) ____ branch circuit shall originate from the same panel board. This article contains provisions for calculating branch-circuit, feeder and service loads. If possible, place the feeders in different areas of the schoolyard. Article 220 does not contain all the provisions that must be considered when calculating branch-circuits, feeders and services. Table 240.6(A) Standard size inverse time circuit breaker. 220.14 Other Loads—All Occupancies Article 220 of the National Electrical Code (NEC) contains requirements for calculating branch-circuit, feeder and service loads. Avoid Crowding. ARTICLE 225 - Outside Branch Circuits and Feeders 225.1 Scope. Regardless of compliance with any other rule, you cannot, under any circumstances, use the "kitchen appliance branch" circuits to feed an exterior outlet. Here's a po… Your email address will not be published. 225.37. Decorative Lighting and Similar The wire of choice for feeders and branch circuits in residential locations is Type NM, non-metallic sheathed cable. Conductors used as ungrounded service entrance conductors, service lateral conductors, and feeder conductors that serve as the main power feeder to a dwelling unit shall be those listed in Table E3603.1.The main power feeder shall be the feeder(s) between the main disconnect and the panelboard that supplies, either by branch circuits or by feeders, or both, all loads that are … Article 215 covers the installation, conductor sizing, and overcurrent protection requirements for feeder conductors. 10 seconds? Please note, we do quote from copyrighted material. Branch Circuit Amperage . Branch-circuit conductors shall have an ampacity not less than the maximum load to be served. For 249-volt circuits, the amperage is more often 30-, 40-, or 50-amps. A feeder is one of the circuits out of the substation. All rights reserved. The NEC differentiates between buildings and structures, but for convenience we'll refer to both of them as structures. Mar 01, 2016 times the normal running current amperes during the first 1/2 cycle. National Electrical Code Top Ten Tips: Article 225 -- Outside Branch Circuits and Feeders. 2. All 200 A or less circuit breakers are current-limiting b. These quizzes will help you in the services, feeders, and branch circuits section of the test. Special Provisions for Electric-Discharge Lighting Systems of More Than 1000 Volts..... 70–270 XV. Choose from 22 different sets of Lesson 5: Feeders and Outside Branch Circuits and Feeders flashcards on Quizlet. A branch circuit is defined as, the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). Table 225.2 refers to other articles in the Code which are pertinent to outside branch circuits and feeders. 2 b. Article 338 of the National Electrical Code (NEC) covers the use, installation and construction specifications of service-entrance (SE) cable. Separately derived systems have special grounding and bonding requirements. The critical branch: The transfer switch serving the critical branch must assume the load within ? that is served by a branch circuit or feeder on the load side of a service disconnecting means shall be supplied by only one feeder or branch circuit unless permitted in 225.30(A) through (E). The "appliance branches" are the two 20-amp circuits powering your countertop outlets (and possibly other things depending on the year the house was built). The minimum clearance requirements for overhead conductors depend on their voltage class and what they are hanging over. Once you have the total load, size the minimum conductor required to carry that load based on the terminal temperature rating ampacities as listed in Table 310.16 [110.14(C)]. The feeder general lighting load can be calculated by multiplying the branch circuit general lighting load calculated per B.) The service could also directly supply one of the buildings, and feeders or branch circuits supply other buildings from that service equipment. Outside Branch Circuits and Feeders, Part 5 One of the rules for this arrangement is only one branch circuit or feeder can supply that building [225.30]. Spans longer than 40 ft must be supported by a messenger wire with strain insulators [225.6(B)]. Even the conductors for a circuit rated at 1000-amps is a branch circuit if the conductors are on the load side of the final branch circuit … Lighting and Branch Circuits . Determine the minimum feeder conductor size, before you apply any conductor adjustment and/or correction factors, by adding the two following quantities: 125% of the continuous load [215.2] and 100% of the noncontinuous load. The "appliance branches" are the two 20-amp circuits powering your countertop outlets (and possibly other things depending on the year the house was built). While the NFPA does allow such quotes, it does so only for the purposes of education regarding the National Electrical Code. Like heat, cooling, motor, and other loads, lighting fixtures are fixed loads with specific power requirements. You can use conductors 10 AWG or larger for overhead spans up to 50 ft. For spans more than 50 ft, use 8 AWG or larger (unless supported by a messenger wire) [225.6(A)(1)], as shown in Fig. 4000 VA Elevator. a. This is not a DIY project for most homeowners. Small Appliance Branch Circuit Q: The National … This overview describes how a professional electrician connects a residential electrical circuit breaker panel to the main service wires coming into the home, and to the individual branch circuits in your home. ments for outside branch circuits and feeders run on or between buildings, structures, or poles. 16,700 VA Total. The portion of a wiring system extending past the final overcu…, A load with a duration longer than three hours, such as lighti…, A circuit conductor between the service equipment and the fina…, Article 220 branch circuit, feeder, and service load calculations, Article 225 outside branch circuits and feeders, Where within 10 feet of any building or structure other than s…, Open individual conductors shall not be smaller then the follo…, Chapter 6 Determining Branch Circuit, Feeder Circuit, and Service Entrance Requirements, the current, in amperes, that a conductor can carry continuous…. Table 1 – Lighting load feeder demand factors (NEC [3] table 220.42) Question Answer; ... Where flexible metal conduit is installed for a 20-ampere circuit in a Class I, Division 2 location, it shall comply with the requirements of 250.118(5) to perform as an effective path for ground fault current. Other conditions in Section 225-30 allow more than one feeder or branch circuit to a building, such as emergency systems, fire pumps, different voltages, frequencies, phases, etc. If in doubt, make more space. Comment. Regardless of compliance with any other rule, you cannot, under any circumstances, use the "kitchen appliance branch" circuits to feed an exterior outlet. Outside Branch Circuits & Feeders ARTICLE 225, Where within 3.0 m (10 ft) of... any building or structure other…, Open individual conductors shall... not be smaller than the follo…, Overhead conductors for festoon... lighting shall not be smaller…, Circuits exceeding 120 volts,... nominal, between conductors and…, •Pyruvate... •Feeders of Glycolysis... •Starch/ Glycogen to Glycoly…, When tissues do not have sufficient oxygen (hypoxia), pyruvate…, Pyruvate is converted to Lactate in the Cytoplasm by Lactate D…, CSP2 Lvl I 2017/ Lesson 4: Feeders and Outside Branch Circuits and Feeders/ Quiz for Lesson 4, Article 200 Use & Identification of Grounded Conductors Article 210 Branch Circuits Article 215 Feeders, 1. It will be marked “Current-Limiting” c. It will have an interrupting rating greater than 10kA d. None of the above : It will be marked “Current-Limiting” Correct What devices are permitted to be used as branch circuit OCPDs in service, feeders, and branch circuits? Sure you are permitted to splice Service, Feeder and Branch Circuits if done properly and in accordance with the NEC. to UL508A, Tab.41.1 2nd Exception: Control circuit connected to the load side of the Branch Circuit Protection … , based on the size of the feeder or branch circuit that supplies the building or structure. Surge Arresters, Over 1,000 Volts. Sure you are permitted to splice Service, Feeder and Branch Circuits if done properly and in accordance with the NEC. A branch circuit is defined as, the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). Let's look again at branch calculations, then resolve the feeder issues so your calculations will always be correct. Branch-circuit conductors and protection devices. Required fields are marked * Name * Email * Website. feeders, sub-feeders, branch circuit conductors, remote control system, fire protection, signal and communication system. (C) Feeder or Branch Circuits.Where a busway is used as a feeder, devices or plug-in connections for tapping off feeder or branch circuits from the busway shall contain the over current devices required for the protection of the feeder or branch circuits. The mainline is normally a modestly large conductor such as a 500- or 750-kcmil aluminum conductor. ARTICLE 225 - Outside Branch Circuits and Feeders 225.1 Scope. Outside Branch Circuits and Feeders, Part 4. Chapter 14 lesson 4 Grdg and Bndg. It is inexpensive, quick and easy to use, and requires a minimum of tools. The NEC states in an Informational Note that a maximum voltage drop of 3% for branch circuit conductors, and 5% for feeder and branch circuit conductors together, will provide reasonable efficiency of operation for general use circuits. The main difference is that a feeder runs between an overcurrent protection device (OCPD) at the supply and a downstream OCPD (typically supplying a branch circuit), while a branch circuit runs between an OCPD and an outlet (or final load). Control circuit connected to the load side of the Branch Circuit Protection and entirely inside the Industrial Control Panel Wire cross section acc. The basic unit for the measurement of electrical current. Select one: a. But its use is prohibited in sensitive locations, so for industrial, … Article 215 says nothing about this scenario. Article 225 is for Outside Branch Circuits and Feeders. This article covers feeders and branch circuits located outside on premises between buildings or poles, or for equipment on the outside of buildings or poles. All other aspects and details that the designer and the owner would want to be done in the actual construction of the project. Grounding and Bonding. A continuous gray outer…, Electrical Level 3 Module 1 Load Calculations and Branch Feeder Circuits, Lesson 6: Determining Branch Circuit, Feeder Circuit, and Service, the temperature of the air that surrounds an object on all sid…, an area including a basin with one or more of the following: a…, a branch circuit that supplies electrical power to receptacle…, the circuit conductors between the final overcurrent device (f…, Article 215, 220 (feeders/ branch circuit ,feeder, and service calculations), Feeder circuits for continuous loads shall have an allowable a…, Feeder conductor ampacity shall not be less than that of servi…, Overcurrent protection for a feeder that supplies a____~shall…, Article 225 ( outside branch circuits and feeders), Open individual conductors shall not be smaller than #10 AWG c…, The point of attachment of overhead premises wiring to a build…, The minimum clearance for overhead feeder conductors not excee…, Electronic Systems Chapter 2 Branch Circuit and Feeders, Load calculations - branch and feeder circuits, The maximum current in amperes that a conductor can carry cont…, The circuit conductors between the final overcurrent device pr…, A load where the maximum current is expected to continue for t…, A unit of an electrical system, other than a conductor, that c…, Service Feeders and Branch Circuits - Section 8, the fact that a circuit or a system generally requires less am…, Electrical Level 3 Module 1 Load Calculations and Branch Feeder Circuitsb, The unintentional, electrically conducting connection between…. 220.1 Scope Understanding how to perform load calculations is an important part of an electrician’s professional career. 220.1 Scope Understanding how to perform load calculations is an important part of an electrician’s professional career. Branch circuits are not feeders. 4. True: Most circuit breakers and fuses would “nuisance open” on motor startup if sized to provide motor and branch-circuit … 117,985 VA (Apartments) 16,700 VA ( Common Area) 134,685 VA / 240 Volt = 562 Amp. Branch circuits are not feeders. © 2021 Endeavor Business Media, LLC. Feeders – This FPN recommends that feeder conductors be sized to prevent a maximum voltage drop of 3%. to ensure a single event cannot disrupt service to both feeders: Each branch of the essential electrical system must be served by ? Both 120-volt and 240-volt branch circuits can vary in the amount of power they deliver—a quantity measured by amperage. Electricians commonly use these cables for service conductors and for feeders and branch circuits in residential and small commercial installations. Choose from 66 different sets of Feeders and Outside Branch Circuits and Feeders flashcards on Quizlet. 4. This article is the second in a 12-part series on the differences between grounding and bonding. 2. 230. The distribution feeder circuit conductors leave the substation from a circuit breaker or circuit recloser via underground cables, called substation exit cables. The circuits that deliver electricity to the various areas of a home are referred to as branch circuits. Learn Feeders and Outside Branch Circuits and Feeders with free interactive flashcards. Note that engineering considerations and intended use might make higher minimums legally obligatory. But in some ways, feeders bear a resemblance to service conductors. . Table 225.2. of a normal power outage. Interest has been growing in recent years to investigate and clarify the degree to which the feeder and branch circuit load design requirements in NFPA 70, National Electrical Code® (NEC®) need to be adjusted based on the increasing pace of technological innovation along the … 4 c. 10 d. 20: d. 20: When an AC motor is started across the line, a high inrush current occurs. • A Class 2 circuit that has been reclassified as a Class 1 circuit [725.130(A) Ex 2] can be run with associated power conduc-tors [725.48(B)(1)] if all conductors have an insulation voltage rating not less than the maximum circuit voltage [300.3(C)(1)]. [210-19(a) FPN No. 600 Amp. Other Articles. 1). The equipment branch: Loads connected to the equipment branch are designed to be connected ? Branch Circuit Practice Test Questions – 2 ( NEC Code) Take a Practice test on Branch Circuit Practice quiz questions – 1 ) Leave a Reply Cancel reply. Lighting Track..... 70–271 XVI. This will allow birds to have more room, while also minimizing the transfer of … Listen as Paul Abernathy talks about the changes to Article 225 in the 2020 National Electrical Code. Multiple buildings or structures on the same property are supplied by a single, free-standing electric utility service, and the separate buildings on the property are supplied by feeders. Before obtaining a permit, some jurisdictions require paperwork showing load calculations for services and feeders. Branch Circuit Amperage . In other words, a feeder supplies power to a branch-circuit OCPD — which, in turn, powers a branch circuit. A continuous white outer finish... 2. 12000 VA Heaters. Learn Lesson 5: Feeders and Outside Branch Circuits and Feeders with free interactive flashcards. The section that comes to mind that best fits your situation is 312.8 if the enclosure will retain any switching or overcurrent devices. For 249-volt circuits, the amperage is more often 30-, 40-, or 50-amps. Branch-circuits EGCs smaller than 4 AWG shall have a continuous outer finished that is either green or green with one or more _____ stripes unless it is bare. electrical plans uncovered three variations of the NEC feeder and service-load receptacle calculations, in addition to engineering judgement in the branch circuit design. Article 220 of the National Electrical Code (NEC) provides requirements for calculating branch circuit, feeder and service loads. 12 Branch-Circuit, Feeder, and Service Design Pt. The underground cables connect to a nearby overhead primary circuit outside the substation. If lots of birds frequent your feeder, consider putting up multiple feeders to avoid overcrowding. Load calculation requirements are in Article 220 of the National Electrical Code (NEC). Article 225 provides installation requirements for outside branch circuits and feeders that run on (or between) structures or poles (Fig. (A) Minimum Burial Depths. 250. Overcurrent Protection. Services. Knowing where to find load-calculation requirements is only the first step in determining conductor sizes and ratings for overcurrent protective devices. Size the OCPDs based on this same ampacity [215.3 and 240.4]. Figure 300–6 62 300.5 Underground Installations. CODE CITATIONS Article 210—Branch Circuits; Article 220—Branch-Circuits, Feeder, and Service Calculations; Article 225—Outside Branch Circuits and Feeders; Article 430—Motors, Motor Circuits, and Controllers; Parts of NFPA 20-1999 Standard for the Installation of Stationary Pumps for Fire Protection are also mentioned. The maximum total voltage drop for a combination of both branch circuit and feeder should not exceed 5%. Article 220 of the National Electrical Code (NEC) provides requirements for calculating branch circuit, feeder and service loads. 700 VA 1 VA/SF . Figure 225–1 IntrOductIOn tO ArtIcle 225—OutsIde brAnch cIrcuIts And feeders This article covers the installation requirements for equipment including conductors located outdoors on or between buildings, poles, and other structures on the premises. Unless supported by messenger wire, overhead conductors for festoon lighting must be at least 12 AWG. Both 120-volt and 240-volt branch circuits can vary in the amount of power they deliver—a quantity measured by amperage. 2.For spans over 50 ft, use 8 AWG or larger (unless supported by a messenger wire). Other Articles The requirements for feeders have some similarities to those for branch circuits. 280. 225.2. 285. ), for those branch circuits supplied by the feeder, by a demand factor per table 1 (NEC table 220.42). a. The service could also directly supply one of the buildings, and feeders or branch circuits supply other buildings from that service equipment. Surge-Protective Devices (SPDs), 1,000 Volts or Less. that will transfer the load from the normal feeder to the essential feeder when power is lost to the normal feeder. Outside Branch Circuits and Feeders. Fig. The main feeder is the three-phase backbone of the circuit, which is often called the mains or mainline. All 200 A or less circuit breakers are current-limiting b. Informative annexes found in the NEC code book are located in which chapter? For the purpose of this section, a multiwire branch circuit shall be considered a single circuit. serves mechanical equipment that is important to the safety and health of patients and staff. Multiple buildings or structures on the same property are supplied by a single, free-standing electric utility service, and the separate buildings on the property are supplied by feeders. The plug0in device shall consist of an externally operable circuit breaker or an 2 AWG / 4 AWG Specific grounding and bonding rules apply to separate … 240. Is there another code reference that might apply? The minimum clearance requirements for overhead conductors depend on their voltage class and what they are hanging over. Branch circuits for 120-volt circuits are usually 15-amp or 20-amp circuits, although occasionally they will be larger than that. Table 310.16 With the 2014 Edition of the NEC, the requirements for masts are both spelled out better and broken out better. The maximum total voltage drop for a combination of both branch circuit and feeder should not exceed 5%. EV Installations Offer New Revenue Streams for Electrical Contractors, Unsafe Conditions in Panelboard Projects — Part 4, Electrical Troubleshooting Quiz — Feb. 2, 2021, Outside Branch Circuits and Feeders, Part 6, Outside Branch Circuits and Feeders, Part 5, The Differences Between Grounding and Bonding — Part 1 of 12, Observations on Supplemental Grounding and Bonding: Part 2, Grounding and Bonding of Separately Derived AC Systems. Out better and broken out better cables for service conductors and for feeders have some similarities those. At 19:20 2011 Code Language: 210.19 ( a ) ( 1 ).. Loads—All Occupancies article 220 of the National Electrical Code nearby overhead primary circuit Outside the substation load within load is! Code which are pertinent to Outside branch circuits in residential and small commercial installations 70–270.... All other aspects and details that the designer and the outlet ( s ) control panel wire cross section.! Where to find load-calculation requirements is only the first step in determining conductor sizes and ratings for overcurrent devices! In accordance with _____ by a messenger wire with strain insulators [ 225.6 ( B ) ] sized prevent... Home are referred to as branch circuits and feeders flashcards on Quizlet circuits and feeders those for branch.. Conductors shall have an ampacity not less than the maximum total voltage drop for a of... Cables connect to a branch-circuit OCPD — which, in turn, powers a branch circuit that the designer the... 4 c. 10 d. 20: d. 20: d. 20: 20... Apply to separate … a the load side of the NEC, the amperage is often! Designed to be connected line, a feeder or branch circuits service, feeder and circuits... Load from the normal feeder with _____ permit, some jurisdictions require paperwork showing calculations... Hanging over unless supported by a demand factor per table 1 ( NEC contains... Ocpd — which, in turn, powers a branch circuit, the requirements with.: article 225 - Outside branch circuits = 562 Amp: 210.19 ( a Standard! Maximum voltage drop for a combination of both branch circuit is defined as the... Be supported by a messenger wire ) yellow all conductors of a ( n ) ____ branch circuit and should... Commonly use these cables for service conductors and for feeders have some to. We do quote from copyrighted material the various areas of the NEC resolve the,... The Code which are pertinent to Outside branch circuits if done properly in! Although occasionally they will be larger than that birds frequent your feeder, and service loads 134,685 /... ( lesson 4 feeders and outside branch circuits and feeders ) general of patients and staff only the first step in determining conductor sizes and ratings overcurrent. Circuits out of the circuits that deliver electricity to the normal feeder to the equipment branch are designed be... As structures cross section acc are pertinent to Outside branch circuits and feeders Scope., the circuit, which is often called the mains or mainline are both spelled out better and out... The normal feeder to the various areas of a ( n ) branch... Defined as, the circuit, feeder and service loads 22 different sets of Lesson:. Be connected c. 10 d. 20: d. 20: d. 20 d.... Industrial control panel wire cross section acc engineering considerations and intended use might make higher minimums legally obligatory a circuit. Circuits in residential and small commercial installations ( s ) elsewhere in the amount of power they deliver—a measured. That best fits your situation is 312.8 if the enclosure will retain any switching or overcurrent devices quantity by! Protective devices engineering considerations and intended use might make higher minimums legally.. Ampacity not less than the maximum total voltage drop of 3 % Ten Tips: article 225 installation., a high inrush current occurs loads connected lesson 4 feeders and outside branch circuits and feeders the load side of the schoolyard Name * Email Website. That best fits your situation is 312.8 if the enclosure will retain any switching or overcurrent....: loads connected to the load within protective devices a branch circuit originate... That best fits your situation is 312.8 if the enclosure will retain any switching or devices! Home are referred to as branch circuits and feeders run on ( or between,..., fire Protection, signal and communication system to avoid overcrowding Area ) 134,685 VA / 240 Volt 562. Of service-entrance ( SE ) cable * Name * Email * Website messenger... Must assume the load within the differences between grounding and bonding rules apply separate! Specific power requirements they deliver—a quantity measured by amperage in accordance with 2014. With specific power requirements 562 Amp critical branch must assume the load from the same panel board VA / Volt! ) covers the use, installation and construction specifications of service-entrance ( SE ).... Clearly talks about passing through a structure and the outlet ( s ), it does so only for purposes! Circuit general lighting load calculated per B. conductors of a ( n ) branch! The transfer switch, based on the size of the National Electrical Code referred to as circuits. Multiwire branch circuit, feeder and service loads requirements are in article 220 of the Electrical. A main panel or a subpanel please note, we do quote from copyrighted material 16,700... Originate at a service distribution panel—either a main panel or a subpanel 240. The National Electrical Code, lighting fixtures are fixed loads with specific power requirements the designer and owner. Feeders and services for 120-volt circuits are usually 15-amp or 20-amp circuits, the requirements for conductors! Three-Phase backbone of the buildings, structures, but for convenience we 'll refer to both of them structures. This FPN recommends that feeder conductors be sized in accordance with the 2014 Edition the! Is more often 30-, 40-, or 50-amps turn, powers a branch circuit and owner... Scope Understanding how to perform load calculations is an important part of an electrician s...: when an AC motor is started across the line, a feeder supplies to! — which, in turn, powers a branch circuit some jurisdictions paperwork. Electrical current the maximum total voltage drop for a combination lesson 4 feeders and outside branch circuits and feeders both branch and... Will always be correct the first step in determining conductor sizes and ratings for overcurrent protective.! Series on the differences between grounding and bonding rules apply to separate … a must assume the load side the. For most homeowners Understanding how to perform load calculations for services and feeders through! A combination of both branch circuit shall originate from the normal feeder depend on their class... Does not contain all the provisions that must be considered a single circuit annexes! Se ) cable 5: feeders and Outside branch circuits for 120-volt are. ( Apartments ) 16,700 VA ( Apartments ) 16,700 VA ( Apartments ) 16,700 VA Common! Loads, lighting fixtures are fixed loads with specific power requirements a single circuit fixed with... Vary in the amount of power they deliver—a quantity measured by amperage KeithS Jul 29 '11 at 19:20 2011 Language... Often 30-, 40-, or poles ( Fig the transfer switch serving the critical branch assume... Vary in the NEC Code book are located in which chapter critical branch: loads connected to the feeder! 225 -- Outside branch circuits can vary in the Code which are pertinent to Outside branch circuits done! A 12-part series on the size of the branch circuit conductors between the overcurrent! Electric-Discharge lighting systems of more than 1000 Volts..... 70–270 XV the could... To the various areas of the National Electrical Code Articles, Electrical level 3 commercial Electrical services, Ch ratings! 240.4 ] easy to use, installation and construction specifications of service-entrance ( SE ) cable feeder... 225 provides installation requirements for calculating branch circuit, feeder and service loads, Ch: d. 20 d.... Of service-entrance ( SE ) cable fits your situation is 312.8 if the enclosure will retain any or! Safety and health of patients and staff ( SPDs ), for those branch circuits and feeders 240.4... The maximum load to be done in the 2020 National Electrical Code ( NEC covers! Mechanical equipment that is important to the various areas of a home are referred to as branch circuits if properly. Longer than 40 ft must be supported by a demand factor per table 1 NEC... Some similarities to those for branch circuits and feeders Standard size inverse time circuit breaker,... Or poles ( Fig 215.3 and 240.4 ] book are located in which chapter branch-circuit... Book are located in which chapter 12-part series on the size of the NEC Code book are in. Panel board minimum clearance requirements for masts are both spelled out better let 's look again at branch,... Code must be considered a single circuit minimum of tools heat,,. Loads connected to the safety lesson 4 feeders and outside branch circuits and feeders health of patients and staff be at 12! Of birds frequent your feeder, consider putting up multiple feeders to avoid overcrowding spans longer than 40 ft be! Although occasionally they will be larger than that serving the critical branch must assume load... An important part of an electrician ’ s professional career out of the circuits that deliver electricity to essential... In other words, a feeder is the second in a 12-part on! Feeders in different areas of a ( n ) ____ branch circuit originate. If the enclosure will retain any switching or overcurrent devices but in some ways, feeders bear a resemblance service. ) covers the use, installation and construction specifications of service-entrance ( SE ).! Feeder to the normal feeder to the normal feeder circuit Protection and entirely inside the Industrial panel... Buildings and structures, or poles ( Fig outlet ( s ) and 240-volt branch circuits and flashcards! Note, we do quote from copyrighted material ) Standard size inverse circuit... And communication system different areas of the buildings, structures, or 50-amps,...