IS 15707 : 2006 Testing, Evaluation, Installation and Maintenance of ac Electricity Meters - Code of Practice

1 Scope

1.1 This Code outlines informative requirements and good guidance as Code of practices to variousstakeholders and service providers in metering industry responsible for maintaining metrological andfunctional performance throughout the long unattended period of useti.d life of.ac electricity meters, coveringtheir testing, evaluation, installation and maintenance. The objective is also to establish a performance basedgood meter asset management plan.

1.2 This Code covers the following aspects:

a) Type approval;

b) Life certification;

c) Verification;

d) Sealing and seal management;

e) Acceptance;

f) Transportation;

g) Storage;

h) Installation and commissioning;

j) Maintaining in-service with emphasis on in-service compliance; and

k) Meter test station practices.

1.3 This Code also deals with:

a) Identification and removal of defects in reasonable time;

b) Repair;

c) Re-certification and re-verification; and

d) Disposal.

1.4 This Code covers Class 2.0, 1.0, 1.0 S and 0.5 S low, medium and high voltage meters rated up to 33 kVas per IS 13010, IS 13779 and IS 14697. In-service compliance testing of meters for low and mediumvoltage applications are generally carried out using statistical sampling techniques; so that meteringproviders may identify appropriate action plans for divergent meter populations. At present sampling byattributes has been preferred. High voltage meters may be subjected to 100 percent testing.

1.5 The model recommendations and practices are given with special emphasis on:

a) Correct and proper installations;

b) In-service surveillance; -

c) Safety measures;

d) Testing at various stages;

e) Standards for meter testing and periodicity of calibration thereof;

f) Concept of certified life;

g) Requirements for in-service compliance testing; and

h) Performance based meter asset register.

NOTES

1 The attributes method of sampling has been considered in this Code.

2 Special requirements for Class 0.2 S extra high voltage meters have been excluded and will be considered later.

3 Presently there is no designated notified body in India responsible for type approval, life certification or verification sealing. Part of the verification function is covered under the BIS Certification Marks Scheme. Once a body is notified for type approval, life certification and verification sealing 4, 5, 6, 7 would become normative.

4 The reference to Electromechanical meters in this Code is for meters already installed.

1.6 The following clauses of the Code are informative.

4 Type approval;

5 Life certification;

6 Verification;

7 Verification sealing;

11.3.3 Installation of instrument transformers;

11.6 Terminations; and

14 Recertification/Re-verification/In-service recompliance 14 (a) and 14 (b) only.

2 References

The following standards are necessary adjuncts to this standard: