Tenaga Nasional Berhad
Tenaga Nasional Berhad
Tenaga Nasional Berhad
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vii.<br />
Dimension for LVCTs are as shown in Table 2 for the appropriate sizing of the busbar.<br />
Table 2<br />
C.T Ratio Internal Diameter External Diameter<br />
100/5 35 mm 90 mm<br />
150/5 40 mm 90 mm<br />
200/5 40 mm 90 mm<br />
300/5 60 mm 100 mm<br />
400/5 60 mm 100 mm<br />
500/5 65 mm 125 mm<br />
600/5 65 mm 125 mm<br />
800/5 65 mm 125 mm<br />
1000/5 85 mm 125 mm<br />
1200/5 100 mm 140 mm<br />
1600/5 100 mm 140 mm<br />
2000/5 110 mm 145 mm<br />
viii.<br />
The Electrical consultant Engineer / Electrical Wiring Contractor shall ensure the above requirements<br />
are complied wih. Should there be any deviation(s) from the requirements, he should consult the TNB<br />
Distribution Division Local Office.<br />
6.0 MEDIUM AND HIGH VOLTAGE METERING<br />
6.1 General<br />
Currrent transformers (CTs) and potential transformers (PTs) for all metering shall be provided by the consumer. A<br />
consumer shall be required to install suitable metering CTs and PTs at his incoming switchgear at his own expense<br />
following TNB’s specifications and subjected to test by TNB.<br />
A floor mounted metering cubicle as per Appendix 19, Drawing No. 7A-7L shall be provided by the consumer in the<br />
specified metering room for the installation of TNB’s meter.<br />
The schematic drawings together with the load data using the form as in Appendix 20 are required to be forwarded to<br />
the TNB Metering Services HQ/Regional for his advice on the metering requirements. All drawings must be signed by<br />
a Professional Engineer.<br />
58 TENAGA<br />
NASIONAL B E R H A D
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