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
studies shall be carried out by the particular manufacturer or by the Contractor at
no additional cost to the Owner.
3.13 Equipment Testing and Commissioning
A. General: The testing of all electrical equipment shall include, but not be limited
to, the items below. This shall be in addition to testing specified elsewhere in this
specification.
1. General Equipment check.
2. Field wiring and ground system verification.
3. Conductor insulation tests.
4. Equipment adjustment.
The Contractor shall be responsible to make arrangements for power required for
testing and commissioning purpose. The testing shall be a continuous process to
maintain the construction schedule to the satisfaction of the Supervising Engineer.
The Supervising Engineer shall have full access to observe all facets of the testing.
All terminals, connections and attachments, all covers, insulating fittings, supports,
hardware and field mounted accessories shall be checked for proper tightness.
B. Cable: Testing of all cable furnished and installed under this specification shall be
in accordance with all related sections.
C. Grounding: Testing and grounding of equipment and cable, shall include, but not
be limited to the tests below:
1. Earth continuity tests shall be made from each item of equipment to the
appropriate main ground system and on the main ground system to the ground
rods.
2. The resistance to ground for selected ground rods:
All ground resistance measurements shall be made with a three terminal “megger”
type ground tester which applies alternating current to the electrodes and which gives
a reading in direct current ohms. Two reference ground probes shall be used and all
tests shall be made in accordance with the instrument manufacturer’s instructions for
ground resistance testing. Prior to connection of ground rods to the grounding system
the Contractor shall obtain individual measured ground resistance data from selected
ground rods as indicated on the drawings. These data shall be obtained, identified,
and recorded under the supervision of the Supervising Engineer and the results sent to
the Supervising Engineer within five days.