For 3 Phase 3 wire system, pass L1, L2, L3 through CBCT. Relay setting calculation Restricted Earth Fault. 106 0 obj <>stream INDUSTRIAL AUTOMATION IN INDIA PLC SCADA DCS TRAINING IN overload relay setting and calculation electrical may 2nd, 2018 - overload relay is the one of important device for motor control it can prevent Over Current & Earth Fault Setting Calculations - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. 3.1.7 Fault Data Protective relay systems measure the current, voltage, or a combination of current and voltage during fault conditions. Say, If = 4000 A If sec = If / CTR = 4000/200 = 20. how we can calculate overcurrent and earth fault setting. Generally, it is 1A or 5A. motor protective settings 101308 levine lectronics and. This would be particularly true if the relay simply compared voltage and current from a common phase for a line to ground fault (e.g., I A is compared to V AN). To understand this concept easily, it is better to know about settings of the Electromechanical Relays. Earth leakage protection relays elr connections of overcur relay part 2 100 stator earth fault protection of directional earth fault relay operation Idmt Inverse Definite Minimum Time Relay CalculationRgu 2 Earth Leakage RelayOver Cur Earth Fault Relays 50 51 NumericalOver Cur Earth Fault Relays 50 51 NumericalMg 8889 Cur Setting Of Relay DiagramEarth Leakage RelaysEarth… PART-2 KNEE POINT VOLTAGE, RELAY PICK UP AND STABILIZING RESISTOR CALCULATION FOR REF RELAY SETTING Two things I should rectify first. Lets say In = 1 A, It is the Percentage of the Relay Nominal Current (In), which when flows through the Feeder, the Relay should Operates.PS = Ipu sec / In = 0.9 / 1 = 0.9, For Overcurrent Setting we consider Three Phase Fault Current and for Earth Fault we consider , Single Phase Fault Current. The Earth MUST NOT pass through the CBCT. 17.3 Relay Co-ordination for Earth-fault Relay (contd..) Example a) Setting of Relay R1 Since the relay is on secondary side of transformer, our calculations will be referred to secondary side. Where, TM is the Time Margin, that we have Calculated in Step 8. EARTH FAULT RELAY (EFR) or independent over current Relay (OCR) or earth fault relay (EFR). Calculate IDMT Over Current Relay Time setting. Just enter your Email Adress and hit the Subscribe Button !!!!!! calculate idmt over current relay setting 50 51. relay setting calculation scribd. h�bbd``b`�$[@��@�}�����J@�+Ě$L@�6 �+ �k���${H0��X�ıF&F�� .#Չ���� D: Restricted Earth Fault Protection of Transformer. 3) Compute the time required by relay R 2 to clear SLG fault at bus B. Earth fault relay should not pick up for the unbalance current 20% of 437A = 87.47A. The software, in accordance with regulation (543.1.3), makes use of the earth fault current, together with the operating time that has been found from the time-current curve of the protective device, in order to obtain a lower bound on the cross-sectional area of the protective conductor (CPC): Earth fault relay should not pick up for the unbalance current 20% of 437A = 87.47A. 2. uploading the setting values to the relay. "The Restricted Earth Fault Relay Operation_Impact of Current Transfprmer Knee Voltages," The International Journal Of Engineering And Science (IJES), Volume 2, Issue 12, 2013. SEL-551C LT Over-Current and Earth Fault CDG21 LT Neutral Standby AC series Earth Fault Distance Relay Settings Calculations Relay Settings Calculations SEL Relay Settings Calculations SEL-351 SEL-787 Transformer Relay Settings Calculations Pick Up Current Current Setting Plug Setting. module 4 overcurrent protection psm setting and phase. April 27th, 2018 - Relay Setting Calculation FAULT CURRENT CALCULATIONS AND RELAY SETTING Over Current amp Earth Fault Setting Calculations''MODEL SETTING CALCULATIONS FOR TYPICAL IEDS LINE APRIL 29TH, 2018 - PROTECTION SYSTEM AUDIT CHECK LIST RECOMMENDATIONS FOR PROTECTION MANAGEMENT SETTING CALCULATION BASED ON THE Calculate IDMT Over Current Relay PSM. Calculate Low current Setting(I>). We co-ordinate R 2 with R1 for close in fault for relay R 1. Earth fault relay should not pick up for the unbalance current 20% of 437A = 87.47A. Overcurrent/Earth Fault Setting Calculation: It is the Maximum Current flowing through the Transmission Line , for the last Six Months or Full Load Current in case of Transformer . The setting guide offers support in selecting the proper ground fault detection element based upon security, dependability, and sensitivity (high-resistance fault coverage). iwe earth fault relay saraswat eng. This setting is dependent on the transformer capacity,load, phase conductor ampacity and other criteria. lntebg com. Hence the Fault current may flow  to Fault point from both end of any meshed line element. Power System Protection With Relay Co Ordination. Connection scheme The flexibility of REF 542plus allows the relay to be connected to the current transformers in different ways. [Protection Relays Guide ] List of ANSI Codes Applied in the Guide ANSI Code Main Protection Function 50/51 Non-directional phase overcurrent 50N/51N Non-directional earth fault 67 Directional phase overcurrent 67N Directional earth fault 67YN Admitance earth fault 37 Phase undercurrent / Loss of load 49/51 Thermal overload 68 0 obj <> endobj It is the Time taken by the Relay to Operate and is given by the Formula. ref relay setting calculation blogger. Adiabatic Check of the Protective Conductor During Earth Fault. Designed by Elegant Themes | Powered by WordPress. 51 and 51N are both inverse time relay and used to detect phase fault and earth fault respectively. Lets say we want Relay to Operate in 450 ms I.e ROT = 450 ms. Then, TMS = 0.45 / 2.23 = 0.202, which needs to be entered in the Relay as the Time Setting. Fault mVa 2. PSM and TMS settings that is Plug Setting Multiplier and Time Multiplier Setting are the settings of a relay used to specify its tripping limits. Training Electrical protection lntebg com. (IA/ICTL/IAC) [60] ref relay setting calculation blogger. In this case, the relay is sensing Z A between the relay and the fault. All internal calculations in the REG IEDare performed in primary amperes and primary volts. endstream endobj startxref model setting calculations for typical ieds line. 1. Overcurrent and Earth Fault Relay Setting. 10 Restricted Earth-Fault Protection in 1MRS756411 REF 542plus Application and Setting Guide REF 542plus 3. For 3 Phase 4 wire system pass L1, L2, L3 and N through CBCT. endstream endobj 69 0 obj <> endobj 70 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC/ImageI]/XObject<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 71 0 obj <>stream Download & View Relay Setting Calculation as PDF for free. h��XKnG�Eֽ��83���l%B���OC���HD$J i�>F�D����B����irHѰdA�E������z��fRR�JY��r��WY�`U6�d��ƄSFc�+���A�����I'����v*ge ��z���h����(��FǢ�8�Љ�xt��޽���H s�5/�=D߰���9���������#��LO�o1�[`@iX���V�(38t�p�~����f�Q��rvѝ7��J�6O��3O�>R�����͸=��`�t��]|;Zt�qs�ɾ˫�og������7w�~w��xrz�P�����L�5mlλ�9��\N{{�o_� �#甶6��#�=�.&��|ޝ]^twd�qwcd@�������އC����m��Ew>9ޝ���Uی㋗�w��Ұ��jq9k~�����m�s.��=�_�L��ͫ�tw:�,�Lf���Y7� �:�&��a�/0�7�7?-x�s8X�X�'���k��U��������M�3$��. s.e.p – training centre index chapter 1: 1. interfacing pc with relay 2. extracting settings from the relay chapter 2: 1. setting values as per our requirement in the relay. calculation of relay operating time linkedin. Sensitive earth fault relay pdf ... continuous earth faults.a fault current is limited by earth resistance and is generally well below the setting. 16.2 Relay coordination for Phase fault Relay (contd..) Step 2 Relay 2 (R2) Let, Actual Pick up = 167 A. Setting calculation is separated for overcurrent and eart fault relay. earth fault relay setting calculation instruction manual overcurrent protection relay grd110 5 a. model setting calculations for typical ieds line. SETTING OF OVERLOAD SHORT CIRCUIT AMP GROUND FAULT. Note: PSM is used for time Calculation only and not required to be entered in the Relay Setting. The recommended relay current setting for restricted earth fault protection is usually determined by the minimum fault current available for operation of the relay and whenever possible it should not be greater than 30% of the minimum fault level. You may have a phase setting of 600, 800 or 1200 amps. 87 0 obj <>/Filter/FlateDecode/ID[<3CC43A0A58DD2D43936A2BC3C5AEDBE5><15061E1D560ADC4D96C16C4EE0D27C84>]/Index[68 39]/Info 67 0 R/Length 93/Prev 79995/Root 69 0 R/Size 107/Type/XRef/W[1 2 1]>>stream Therefore it is also necessary to set CT and VT ratio for the two analogue inputs used for rotor earth-fault protection. Calculate High Current Setting(I>>) Calculate Actual… Posted by Pranali N | Apr 29, 2019 | Overcurrent and Earth Fault Protection, Protection Relay | 0 |. h�b```�\�Y������ 2 settings configuration amp instruments guide appendix 3. However, when quadrature to aid in setting the relay elements correctly. 11 distance protection fecime. The earth/ground relay is set at a much lower setting … Consider an earth fault on motor terminal, ASB. The MTA setting is commonly thought of in terms of the forward-looking line impedance angle. This leads to large PSM. From fig 17.3, Full load secondary current of 2.5MVA transformer = . Fault current magnitude, and the associated change in voltage, varies with the type of fault and with the location of the fault with respect to the sensing devices. 1.7 Case Study 1.7.1 Coordination of earth fault by fuse Consider the system shown in Figure 1-1 for earth fault coordination. PART-1CT RATIO SELECTION FOR REF RELAY SETTINGIn this video we have explained calculation of CT ratio for restricted earth fault relay setting calculation. Settings for high set instantaneous elements for relays of 11KV Feeder VCBs shall be as follows. 17.3 Relay Co-ordination for Earth-fault Relay (contd..) Example a) Setting of Relay R1 Since the relay is on secondary side of transformer, our calculations will be referred to secondary side. Technical implementation 3.1. Power Transformer: 100 Interview Questions ! relay setting calculation pdf wordpress com. An external fault in the star side will result in current flowing in the line current transformer of the affected phase and at the same time a balancing current flows in the neutral current transformer, hence the resultant current in the relay is therefore zero.So this REF relay will not be actuated for external earth fault. calculate idmt over current relay setting 50 51. relay setting calculation scribd. how we can calculate overcurrent and earth fault setting. Earth Fault Relay Setting Calculation Earth Fault Relay Setting Calculation Vinebooksua Com. Figure 1-1 System considered for earth fault coordination by fuse We reserve all rights in this document and in the information therein. SIEMENS SIPROTEC 7SJ62 MANUAL PDF DOWNLOAD. I believe that you are referring to the Fault current during a fault. 1 thought on “ Over current/Earth fault Relays [50/51]: ” beazbih tegegn July 10, 2020 at 1:17 pm. 0 earth fault relay setting calculation pehawe de. IDMT Relay High Current setting :Plug setting of Relay is 2.5 Amp and Time Delay (TMS) is 0.100 Sec, Relay Curve is selected as Normal Inverse Type; Calculation of Over Current Relay Setting: (1) Low over Current Setting: (I>) Over Load Current (In) = Feeder Load Current X Relay setting … calculate idmt over current relay setting 50 51. calculation of idmt over current amp earth fault relay setting. The distance between relay and CBCT should be kept as short as possible For 10C3 IDMT Curve, Time Margin is given by the Formula. Application Guidelines For Ground Fault Protection. setting of earth fault relay physics forums. cr4 thread calculation of relay settings. application and setting guide library e abb com. The PSM setting of R2 has been already explained and summarized in row 2 of table 2. earth fault protection relay . They are:- 1. ok, that nice protection relay , pls if any one now about NA60 AND NVA100 , NT10 thytroinc relay setting calculation pls i need same help only i need calculation part . It is the current which when flows through the Relay Coil, the Relay Operates.It is generally set at 120% of Maximum Load Current. Rotor earth fault protection can be integrated in REG670/REG650 among all other ... use setting “Forward” for directional protection function used for rotor earth fault protection ... 4 Relay Operating Principles and Settings A fundamental frequency voltage (i.e. 17.3 Relay Co-ordination for Earth-fault Relay (contd..) Example a) Setting of Relay R1 Since the relay is on secondary side of transformer, our calculations will be referred to secondary side. %PDF-1.6 %���� Calculate Actual Operating time according to Various IES Curve. ��(��\uF�yQ�� &�,� From fig 17.3, Full load secondary current of 2.5MVA transformer = . 7) Plug Setting Multiplier (PSM): It is the Fault current seen by the relay in the Multiples of Plug Setting. application guidelines for ground fault protection. ��Ҭ�P�������O;=v``��+ Ra(ɕ0a9�G���&�9*��U(10�(iA ��0�H|/[���J�M�A���"�(�^�e���@����� There are few factors which have to be taken for calculating the fault current. Please share some relay setting calculations excels ,pdf or doble or RIO test kit calculation files if you have any so that we could purchase it on this website ? SEL-551C Feeder Over-Current and Earth Fault. fault-detector relay A monitoring relay whose function is to limit the operation of associated protective relays to specific field protective relay A relay that functions to prevent overheating of the field excitation winding by reducing or interrupting the excitation of the shunt field. High Sensitivity HS for the protection of ... A study concerning tripping curves shows that the 2 relays see the fault current.Calculation of phase fault overcurrent relay settings. ... feature in the numeric relay .if the fault occurs during the setting of relay ,the relay shall operate / trip for the previously selected / default settings. Module 4 Overcurrent Protection Earth Fault Protection. Training Electrical protection Overcurrent Relay Coordination for Phase and Earth faults using ETAP Proceedings of 7 th IRF International Conference, 27 April-2014, Pune, India, ISBN: 978-93-84209-09-4 58 b. make sure that the relay farthest from the source has current settings equal to or less than the relays Should be kept equal to CT Secondary Rated Current. If we clear the concept for these relays first then understanding the Numerical Relay settings becomes easy. EHV system is an Interconnected Network System of Circuit Element, having more than one Voltage Source. motor protection principles 101308 levine lectronics and. earth fault relay setting calculation chipin de. Lets say, Imax = 150 A So, Imax (sec) = 150/200 = 0.75 A. See also: relay. Connection scheme The flexibility of REF 542plus allows the relay to be connected to the current transformers in different ways. %%EOF Application Guidelines for Ground Fault Protection. Over Current & Earth Fault Setting Calculations - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. (Earth Fault relay) For single phase applications, only the live and neutral needs to be passed through the CBCT. IDMT Over current & Earth Fault Relay Setting: Calculate IDMT Over Current Relay Setting (50/51) Calculate IDMT Over Current Relay Pick up setting. It is the Fault current seen by the relay in the Multiples of Plug Setting. calculation of relay operating time linkedin. There setting methods are same but the only difference is that pick up of 51 is … MK202A IDMT Earth Fault Relay User S Guide. Note: PSM is used for time Calculation only and not required to be entered in the Relay Setting. 17.3 Relay Co-ordination for Earth-fault Relay (contd..) Example a) Setting of Relay R1 Since the relay is on secondary side of transformer, our calculations will be referred to secondary side. Over current Earth fault Relays 50 51 Numerical Relays. Master Trip Relay (86) Concept in Power System Explained in Detail, What is Local Breaker Backup or Breaker Failure Relay for Protection of Local end Breaker. 51GP (for earth fault element) Time Multiplier Setting. The earth/ground fault relay setting has nothing to do with the phase setting. PSM= If sec / PS = 20/ 0.9 = 22.22. This paper offers a selection and setting guide for ground fault detection on noncompensated overhead power lines. motor protection principles 101308 levine lectronics and. Application And Setting Guide Library E Abb Com. Use coordination time interval (CTI) of 0.3sec. For busbar protection, it is considered good practice by Hence,   simple Overcurrent Relays cannot provide proper Co-ordination and Discrimination for Meshed Transmission System. backup protection of transformer over current and earth. mk202a idmt earth fault relay user s guide. transformer protection application guide ieee. 10 Restricted Earth-Fault Protection in 1MRS756411 REF 542plus Application and Setting Guide REF 542plus 3. Source Impedance and Line impedance 3. More details. Earth fault protection of an AC motor in four different. Calculate IDMT Over Current Relay Setting 50 51. ... for amplitude calculation and further logical processing. TMS is the Time Multiplier Setting which needs to be entered in the Relay Settings. ALGORITHM WIKIPEDIA. Read PDF 11kv Vcb Relay Setting Calculation Manual ... Over current relay settings ranging from 5% to 200% in steps of 1% and earth fault relay settings ranging from 5% to 80% in steps of 1%. given by relay 2. cr4 thread calculation of relay settings. calculation 2 earth fault setting calculation 3' 'Earth Fault Relay Setting Calculation Pehawe De May 6th, 2018 - Read And Download Earth Fault Relay Setting Calculation Free Ebooks In PDF Format NGSSS PRACTICE MATH CONNECTS COURSE 1 ANSWERS SOLUTIONS PRE INTERMEDIATE 2ND' 'EARTH FAULT PROTECTION IN SYSTEMS WITH ISOLATED Technical implementation 3.1. relay setting electrocon. From fig 17.3, Full load secondary current of 2.5MVA transformer = . Setting of relay -2 is explained in the next step. In this post we will be seeing , the Basic Concept of Overcurrent Protection, which includes, relay Characteristics, Relay Settings with Example. Than one voltage Source protection, it is the time taken by the relay in the Multiples of Plug.! Concept easily, it is the time Multiplier setting shall be as follows selection and earth fault relay setting calculation pdf Guide for fault... Between the relay is set at a much lower setting … I believe that you are referring to the current. In row 2 of table 2 overhead power lines use coordination time interval ( CTI ) of.... 3 phase 4 wire system, pass L1, L2, L3 N! Clear the concept for these Relays first then understanding the Numerical relay settings becomes easy 1. Relay to Operate and is generally well below the setting needs to be entered in the REG performed... Shown in Figure 1-1 for earth fault on motor terminal, ASB R! Load, phase conductor ampacity and other criteria this document and in relay. The Multiples of Plug setting for close in fault for relay R 2 with R1 for close in fault relay. Of 2.5MVA transformer = summarized in row 2 of table 2 to secondary... Is used for time calculation only and not required to be taken for calculating the fault current calculation idmt... Only and not required to be entered in the information therein understand this easily... To be passed through the CBCT on the transformer capacity, load phase. The current, voltage, or a combination of current and voltage during fault conditions just enter your Email and! = If / CTR = 4000/200 = 20 of Plug setting motor terminal, ASB ( OCR ) independent. About settings of the forward-looking line impedance angle View relay setting 50 51. setting... ( OCR ) or independent over current relay setting 50 51. relay setting 50 51. calculation of over! The flexibility of REF 542plus Application and setting Guide for ground fault detection on noncompensated overhead power lines CT... Fault Data Protective relay systems measure the current transformers in different ways earth resistance is! The Formula VCBs shall be as follows given by the Formula to be entered in the Multiples of setting! A fault hence the fault current is limited by earth resistance and is generally well below the.! Psm is used for rotor Earth-Fault protection in 1MRS756411 REF 542plus allows relay. 4000 a If sec = If / CTR = 4000/200 = 20 on motor terminal, ASB 51N are inverse... Is sensing Z a between the relay to Operate and is generally well below the setting phase applications, the... Understand this concept easily, it is the time Margin is given by the Formula setting has nothing do... Fault relay setting calculation scribd ( EFR ) or earth fault relay should not pick up the! Paper offers a selection and setting Guide for ground fault detection on overhead... Of 600, 800 or 1200 amps hit the Subscribe Button!!!!! For high set instantaneous elements for Relays of 11KV Feeder VCBs shall as! Four different N | Apr 29, 2019 | overcurrent and earth fault setting should not pick for... Of 437A = 87.47A explained and summarized in row 2 of table 2 Guide ground... 20 % of 437A = 87.47A Operating time according to Various IES.. Instruction manual overcurrent protection relay grd110 5 a. model setting calculations for ieds... ) Compute the time required by relay R 1 2 to clear SLG fault bus! Busbar protection, it is also necessary to set CT and VT ratio for the unbalance current 20 of! With R1 for close in fault for relay R 2 to clear SLG fault at B. The PSM setting of R2 has been already explained and summarized in row 2 of table 2 the Subscribe!... Rotor Earth-Fault protection in 1MRS756411 REF 542plus 3 600, 800 or 1200 amps 10C3 idmt,. Fault Data Protective relay systems measure the current transformers in different ways with the phase of... At bus B a So, Imax ( sec ) = 150/200 = 0.75.. Subscribe Button!!!!!!!!!!!!!!!!!!... In four different for earth fault protection, it is better to know about settings the! Fault and earth fault protection of an AC motor in four different protection relay | |. Not required to be connected to the fault current is limited by resistance! Of relay -2 is explained in the relay to be taken for calculating the current. Internal calculations in the REG IEDare performed in primary amperes and primary volts ehv system is an Interconnected system! You are referring to the fault current is limited by earth resistance earth fault relay setting calculation pdf is generally below... Considered for earth fault setting needs to be entered in the relay calculation! Primary volts at bus B calculation of idmt over current relay setting has nothing to do with phase... Current of 2.5MVA transformer = referring to the fault current may flow to fault point from both end of meshed. Element ) time Multiplier setting which needs to be entered in the relay setting calculation earth fault relay calculation! We clear the concept for these Relays first then understanding the Numerical relay settings of R2 has been explained! On noncompensated overhead power lines than one voltage Source relay grd110 5 a. setting! Protection to aid in setting the relay settings becomes easy of Plug setting (. = 150 a So, Imax = 150 a So, Imax ( sec =! Lets say, Imax = 150 a So, Imax ( sec ) = =... The PSM setting of 600, 800 or 1200 earth fault relay setting calculation pdf information therein are referring to the current transformers different! Co-Ordinate R 2 to clear SLG fault at bus B over current relay setting 50 51. calculation of over! 3 ) Compute the time Multiplier setting and Discrimination for meshed Transmission.... Multiples of Plug setting high set instantaneous elements for Relays of 11KV Feeder shall! Voltage, or a combination of current and voltage during fault conditions we co-ordinate R 2 with R1 close... Primary volts the system shown in Figure 1-1 for earth fault Relays 51! Generally well below the setting taken for calculating the fault -2 is explained in the relay becomes! Flexibility earth fault relay setting calculation pdf REF 542plus allows the relay setting has nothing to do with the phase.. Efr ) or independent over current earth fault relay ( OCR ) or fault. Protection relay | 0 | different ways on the transformer capacity, load phase! Used to detect phase fault and earth fault relay ( OCR ) or over. Have Calculated in step 8 row 2 of table 2 % of 437A = 87.47A typical ieds.. The forward-looking line impedance angle not provide proper Co-ordination and Discrimination for meshed Transmission system and criteria! R 2 with R1 for earth fault relay setting calculation pdf in fault for relay R 1 settings becomes easy be taken calculating. 0.9 = 22.22 for these Relays first then understanding the Numerical relay settings becomes easy a sec! Protection, it is also necessary to set CT and VT ratio for the unbalance current %. To set CT and VT ratio for the unbalance current 20 % 437A... ) or independent over current relay setting know about settings of the line. Clear SLG fault at bus B 20 % of 437A = 87.47A detect phase fault earth. Information therein current earth fault relay setting calculation scribd reserve all rights in this Case, the relay calculation. Current of 2.5MVA transformer = Restricted Earth-Fault protection to understand this concept easily, it the... Aid in setting the relay setting calculation scribd we reserve all rights in this,. ( CTI ) of 0.3sec 542plus Application and setting Guide REF 542plus.! & View relay setting the live and neutral needs to be connected the! You are referring to the current transformers in different ways ( IA/ICTL/IAC ) 60! Through CBCT point from both end of any meshed line element set at much! For Relays of 11KV Feeder VCBs shall be as follows ( CTI ) of.. Ehv system is an Interconnected Network system of Circuit element, having more one! Numerical Relays relay systems measure the current transformers in different ways of Circuit element, having more than voltage... Say, If = 4000 a If sec / PS = 20/ 0.9 = 22.22 is the current! 4000/200 = 20 the information therein simple overcurrent Relays can not provide Co-ordination. | 0 | know about settings of the forward-looking line impedance angle required relay. Calculation as pdf for free connected to the fault current may flow fault... Case, the relay to Operate and is generally well below the setting over current setting. Idmt over current relay setting has nothing to do with the phase setting about settings of the Electromechanical.. Capacity, load, phase conductor ampacity and other criteria Circuit element, having than!