Specifications

NAIROBI OPERATIONAL HUB
UNOPS Building, UN Lane, Off UN Avenue Tel: [phone]
P.O Box 783,Village Market, 00621 E-mail: [e-mail]
Nairobi, Kenya Website: www.unops.org
UNOPS is ISO 9001 certified
be semi-flush mounted and shall be approximately 100 x 100mm square.
Accuracy shall be one percent of full scale values. Moving elements shall
be provided with zero adjustments external to the cases.
C. Ammeters shall be moving iron type, to B.S. 89 scaled 0-2000 A for main
incoming supply.
D. Voltmeter shall be moving iron type to B.S. 89 scaled 0-500V and
provided with 6-position selector switches allowing reading of line to line
and line to neutral voltages.
E. Maximum demand indicators shall be of the thermal type with a 15-
minute time delay.
2.06 kWh METERS
A. The kWh Meters for the concerned local authorities shall be suitable for
operation on 415/240 volts, 3 phase, 4 wire, 50 Hz supply.
B. The meter shall be absolutely dust and vermin proof, protected from
corrosion due to high humidity and compensated against the effect of
temperature upto 55 Deg.
.
C.
C. The Meters shall maintain their accuracy over many years service under
Jordan climatic conditions. The counters shall be of the cycle-meter type
with six digits and shall give a direct reading of power consumption to six
figures, the lowest figure being units and not tenth of units. Pointer type
counters are not acceptable.
D. Multiplying factors shall not be used except for the larger size of current-
transformer operated meter, where 10 and 100 may be used. The
calibrating adjustments shall be operated by screw-driver only.
E. The Meter cover and cases shall be of metal and not plastic.
F. The ratings for direct connected whole current meters shall be 50, 75 and
125 amperes maximum per phase and the terminal holes shall not be less
than 6,9 or 12mm. diameter respectively.
K. Higher ratings meters shall have not less than 5mm. diameter terminal
holes and shall be operate through current transformers with 5 amperes