Tenaga Nasional Berhad

6.4 Metering Cubicle
The consumer shall provide an appropriate metering cubicle to specifications stated in Appendix 19. The maximum
distance allowable between the metering CTs and the metering cubicle is shown in Table 3. The consumer shall send the
cubicle to TNB Metering Services HQ/Regional office for wiring up.
Table 3
CT Burden
(VA)
15
15
30
30
30
30
Secondary Rate Current
(Amps)
5
5
5
5
1
1
Cross Connection Of
Conductor
(mm 2 )
2.5
4.0
2.5
4.0
2.5
4.0
Maximum Distance
Allowable
(m)
30
47
65
100
1,647
2,545
Where meter burden for current circuit = 0.5 VA/ph
6.5 Location of Metering Cubicle
An enclosed locked room specifically for the purpose of installing the floor mounted metering cubicle shall be provided.
The minimum area shall be 1.5 m by 1.7 m.
6.6 Power Supply Point for Remote Meter Reading
A 13 Amps Switch Socket Outlet (S.S.O) is to be provided and shall be installed at the top of metering cubicle.
6.7 Cable Requirement
6.7.1 Indoor Breakers
The consumer shall provide and connect a 12-core PVC/SWA/PVC of 2.5mm 2 or higher between the consumer high
voltage switchboard and the metering cubicle. There shall be no intermediary joint.
The armoured cable shall not be buried or enclosed. Preferably it shall be laid on cable tray.
60 TENAGA
NASIONAL B E R H A D