Operating & Maintenance Instructions 25
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Note 1:- IEC62052-11 (to which IEC62053-21 refers) defines only Basic and Maximum currents as
follows:
Basic Current (Ib) Direct Connected Standard values: 5, 10, 15, 20, 30, 40, 50A
Exceptional values: 80A
and states that Maximum current (Imax) is preferably an integral multiple of Ib:
BS meters shall preferably be an integral multiple of Ib up to a maximum of 100A
(e.g. up to 10 x a basic current of 10A)
Note 2:- IEC62052-11 (to which IEC62053-21 refers) defines the following relevant reference voltages:
Ref Voltage (U
n
) for Direct connected Std values 120, 230V
Exceptional values 100, 127, 200, 220, 240,
Meters with reference currents and voltages other than the above values CANNOT be provided when
the nameplate shows the IEC/EN Standard Number.
If a valid requirement exists for meters with reference values within the acceptable ranges, but not
listed above, specific arrangements to provide nameplates not showing the IEC/EN standard must be
made.
Note 3:- PULSE OUTPUT VALUES
For all meter ratings the normal pulse value for the Test LED will be 1000 pulses / kWh.
The pulse value for the SO pulsing output will be chosen when the customers requirements are entered
into the Configuration Tool software, from the choice of values offered in the software.
Note 4:- BS meters with Ib = 5A are only to be offered with Class 2 kWh accuracy
Figure 1A – Model Code (Continued)
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