IS 13779:1999

List Of Test Equipment Major test equipment required to test as per the Indian Standard Sl. No. Test Equipment Tests used in with Clause Reference 1 Vernier Caliper, Micrometer Cl. 6.1, 6.2, 6.3, 6.5 & 6.7 2 a.c. High Voltage Tester Cl. 12.7.6.1, Cl. 12.7.6.3 & Table 21 3 Insulation Tester Cl. 12.7.6.1, 12.7.6.4 & Table 22 4 Test bench load with phantom system, Reference Standard Meter Cl.11.1,11.4, 11.5, 12.10.1, 12.13, 23 & Table 23 5 Power Meter Cl. 9.1.1, 9.1.2, 12.7.1 6 Voltage drop simulation generator Cl. 9.2.1, 9.2.2, 12.7.2 & Table 11 7 Dust test equipment, Rain Fall Test Equipment Cl. 6.9, 12.5 & 12.7.6.4 8 Shock Test Device Cl. 12.3.1 9 Vibration Test Device Cl. 12.3.2 10 Spring Hammer Test Device Cl. 12.3.3 11 Impulse Voltage Tester Cl. 12.7.6.2 12 Glow Wire Test Apparatus Cl. 6.8, 12.3 13 Short time overcurrent tester Cl. 9.2.3, 12.7.3, Table 12 The above list is indicative only and may not be treated as exhaustive. PM/ IS 13779/ 2/ April 2019 5

PM/ IS 13779/ 2/ April 2019 BUREAU OF INDIAN STANDARDS Manak Bhawan, 9, Bahadur Shah Zafar Marg, New Delhi – 110002 1 PRODUCT MANUAL FOR a.c. STATIC WATTHOUR METERS CLASS 1 & 2 ACCORDING TO IS 13779:1999 This Product Manual shall be used as reference material by all Regional/Branch Offices & licensees to ensure coherence of practice and transparency in operation of certification under Scheme-I of Bureau of Indian Standards (Conformity Assessment) Regulations, 2018 for various products. The document may also be used by prospective applicants desirous of obtaining BIS certification license/certificate. 1. Product : IS 13779:1999 Title : a.c. Static Watthour Meters Class 1& 2 No. of Amendments : 5 2. Sampling Guidelines: a) Raw material : ___ b) Grouping guidelines : Please refer ANNEX – A c) Sample Size : Three Meters 3. List of Test Equipment : Please refer ANNEX – B 4. Scheme of Inspection and Testing : Please refer ANNEX – C 5. Possible tests in a day : : Please refer ANNEX - D 6. Scope of the Licence : Licence is granted to use Standard Mark as per IS 13779:1999 with the following scope: Name of the Product a.c. Static Watthour Meters Class 1 / Class 2, Type ...., Single phase 2-wire/ Three phase 3-wire/ Three phase 4-wire,

Voltage....V, Basic current (Ib) .... A, Maximum current (Imax) ...... A, Frequency ...Hz, Transformer operated (Connection through voltage transformer)/ Transformer Operated (Connection through current transformer only)/ Whole current (direct connection), Insulating Encased/ Non-Insulating Encased, With or Without Earth terminal, Electro-mechanical register/ Electronic display, Indoor / Outdoor Meter PM/ IS 13779/ 2/ April 2019 2

Grouping Guidelines 1. Samples of each variety of meters shall be tested considering the following: i. Accuracy Class – Class1 and Class 2 ii. Number of phases and number of wires - Single phase 2-wire, Three phase 3-wire and 3 phase 4-wire iii. Insulating encased and non-insulating encased iv. Type of display- Electro-mechanical register, Electronic display v. Transformer Operated (Connection through Voltage Transformer), Transformer Operated (Connection through Current Transformer only) and Whole current (Direct Connection) vi. Indoor and Outdoor Type Meters 2. The following relaxation may be given when a variety is tested for all the requirements: i. Same basic current (I b ) and different current ratio (I max /I b ) – One sample of maximum current ratio (I max /I b ) out of the range offered be subjected to all tests. ii. Different basic current (I b ) but same (I max /I b ) – One sample with highest (I b ) and another sample with lowest (I b ) be subjected to all tests. iii. Different basic current (I b ) and different (I max /I b ) – One sample with lowest (I b ) and lowest (I max /I b ) and another sample with highest (I b ) and highest (I

max /I b ) be subjected to all tests. iv. For CSoL – If same (I b ) with different (I max /I b ) is to be included in the licence, the varieties offered be subjected to tests applicable at I max only. 3. If the licence covers only ‘Electro mechanical register’ and CSoL for ‘Electronic display’ is to be considered, then any one sample with ‘Electronic display’ from any one the variety already covered in the license or any new variety intended to be covered in the licence be subjected to all tests or vice-versa. 4. If the license covers only ‘Insulating encased meters’ and CSoL for ‘Non-insulating encased meters’ is to be considered, then any one sample of ‘Non-insulating encased meters’ from any one variety already covered in the license or any new variety intended to be covered in the licence be subjected to all tests or vice-versa. 5. In case of electronic display, manufacturer’s certificate shall be obtained for compliance to the requirement of Clause 6.10 of IS 13779:1999. PM/ IS 13779/ 2/ April 2019 3 6. The Firm shall declare the varieties of a.c. static watthour meters intended to be covered in the Licence. An undertaking shall also be taken from the applicant/ licensee in

respect of construction and design similarity as per clause 3.1.4 of IS 13779:1999 for the range of varieties which they intend to cover in the licence. One set of drawings representing each of these varieties be sealed and kept in the factory for reference whenever required. The Scope of Licence may be restricted based on the Manufacturing and Testing capabilities of the Manufacturer. 7. During the operation of the Licence, BO shall ensure that all the Varieties covered in the Licence are tested in rotation to the extent possible. PM/ IS 13779/ 2/ April 2019 4

Scheme Of Inspection And Testing 1. LABORATORY - A laboratory shall be maintained which shall be suitably equipped (as per the requirement given in column 2 of Table 1) and staffed, where different tests given in the specification shall be carried out in accordance with the methods given in the specification. 1.1 The manufacturer shall prepare a calibration plan for the test equipment. 2. TEST RECORDS – The manufacturer shall maintain test records for the tests carried out to establish conformity. 3. LABELLING AND MARKING – As per the requirements of IS 13779:1999. In addition, connection diagrams and terminal markings shall also be marked indelibly on every meter. 4. CONTROL UNIT – Meters of the same design manufactured in a day shall constitute a control unit. 5. LEVELS OF CONTROL - The tests as indicated in column 1 of Table 1 and the levels of control in column 3 of Table 1, shall be carried out on the whole production of the factory which is covered by this plan and appropriate records maintained in accordance with paragraph 2 above. 6. REJECTIONS – Disposal of non-conforming product shall be done in such a way so as to

ensure that there is no violation of provisions of BIS Act, 2016. PM/ IS 13779/ 2/ April 2019 6 TABLE 1 (1) (2) (3) Test Details Test equipment requirement R: required (or) S:Sub-contracting permitted Levels of Control Cl. Requirement Test Methods No. of Sample Frequency Remarks Clause Referenc e 6.1 to 6.3 General and Constructional Requirements 6.1, 6.2, 6.3 IS 13779 R Each Meter In case of failure of any meter, cause of failure shall be identified and corrective action shall be taken to remove the non- conformity. 9.5 a.c. High Voltage Test 12.7.6.1, 12.7.6.3 IS 13779 R 9.5, 12.7.6.4 Insulation Test 12.7.6.4, 12.7.6.1 IS 13779 R 11.1 Limits of Error Due to Variation of Current 11.1, 12.16 IS 13779 R 11.5 Test of Starting Condition 11.5, 12.14 IS 13779 R 11.4 Test of no-Load Condition 11.4, 12.13 IS 13779 R 9.1 Power Consumption 9.1, 12.7.1 IS 13779 R Three Once in six months for each type and rating In case of failure of any sample, double the number of samples shall be tested and no failure in those samples shall be permitted. After corrective actions samples from two consecutive control units shall be tested and the original frequency may be restored if all the

samples pass. 9.2 Influence of Supply Voltage 9.2.1, 9.2.2, 12.7.2 IS 13779 S 9.2.3 Short Time Overcurrent Test 9.2.3, 12.7.3 IS 13779 S 9.3 Influence of Self-Heating 9.3, 12.7.4 IS 13779 S 9.4 Influence of Heating 9.4, 12.7.5 IS 13779 S 11.6 Meter Constant 11.6, 12.15 IS 13779 R 11.7 Repeatability of Error Test 11.7, 12.17 IS 13779 S 6.6 Clearances & Creepage Distances 6.6 IS 13779 S 6.10 Display of Measured Values 6.10 IS 13779 R 6.11 Output Device 6.11 IS 13779 R PM/ IS 13779/ 2/ April 2019 7 Note-1: Sub-contracting is permitted to a laboratory recognized by the Bureau or Government laboratories empaneled by the Bureau. Note-2: Note-3: Levels of control given in column 3 are obligatory in nature. The manufacturer may define the control unit/batch/lot and submit his own levels of control in column 3 with proper justification for approval by BO Head. 6.9 Protection against penetration of dust and water 6.9, 12.5 IS 13779 S Three Once in a year for each type and rating In case of failure of any sample, double the number of samples shall be tested and no failure in those samples shall be permitted. After corrective actions samples from two consecutive control units shall be tested and

the original frequency may be restored if all the samples pass. 9.6 Immunity to Earth Fault (For 3 phase 4 wire meters) 9.6, 12.8 IS 13779 S 10 Electromagnetic Compatibility 10, 12.9 IS 13779 S 11.2 Accuracy Requirements (Limits of error due to other influence quantities) 11.2, 12.11, 12.10.1 IS 13779 S 11.3 Accuracy Requirements (Limits of error due to ambient temperature variation) 11.3, 12.12, 12.10.1 IS 13779 S 12.3.1 Shock Test 12.3.1 IS 13779 S 12.3.2 Vibration Test 12.3.2 IS 13779 S 12.3.3 Spring Hammer Test 12.3.3 IS 13779 S 8, 12.6 Test for climatic influences 8, 12.6 IS 13779 S 12.7.6.2 Impulse Voltage Test 12.7.6.1, 12.7.6.2 IS 13779 S 6.4, 6.5 Terminal Blocks and Terminal Cover 6.4, 6.5, 6.7 IS 13779 S Three from every consignment of insulating material received No further testing is required if accompanied with Test Certificate 6.8 Resistance to Heat and Fire 6.8, 12.4 IS 13779 S PM/ IS 13779/ 2/ April 2019 8

Possible Tests in a day 1. General and Constructional Requirements 2. a.c. High Voltage Test 3. Insulation Test 4. Accuracy Requirements (Limits of Error) 5. Test of starting condition 6. Test of no-load condition 7. Power Consumption