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
C. For buried low current/communication cables or duct banks, use warning tapes as
per the standard practice of Local Telecom Supplier and applicable international
standards.
2.07 CABLE MARKERS
A. Buried cables shall be permanently identified by concrete markers. The markers
shall be 600 mm square x 100 mm thick with impressed character; they shall be
made of grade 20 concrete, with 10 mm aggregate. The impressed characters shall
be in English and Arabic and worded "HV CABLE" or "LV CABLE" as
appropriate together with circuit details as required for proper identification. In
addition, the word “JOINT” shall be added to above words, where applicable.
B. Except where cables are buried, located in switchrooms, in ducts and spaces
designated solely for electrical services, or have orange oversheaths; they shall be
identified by adhesive bands colored orange, complying with standards and codes
of practice mentioned elsewhere in the Specifications. The bands shall be not less
than 100 mm long, located at least once within each separate compartment through
which cables pass and at intervals not exceeding 12 m.
C. Except where cables are buried or enclosed in conduit, trunking or ducting; they
shall be permanently identified by discs. The discs shall be of laminated plastic
materials with black character on white; character shall be not less than 3 mm high.
The inscription shall indicate the nominal voltage, the designation of the load, the
number and cross sectional area of cores and the rated voltage of the cable.
D. Cables identification discs shall be attached to the cables with ties. Disc shall be
located within 500 mm of terminations and joints, at least once within each
separate compartment through which the cable passes, and at intervals not
exceeding 24 m, they shall coincide with the colour bands.
2.08 EQUIPMENT WARNING/DANGER SIGNS
A. For external use, pressure sensitive danger signs shall be used. Dimensions shall be
as approved by the Engineer. The signs shall be heavy duty vinyl with a self-
adhesive backing which can be applied to curved or irregular surfaces. Danger
signs shall be weather-resistant and shall not discolor or deteriorate with age.
B. Danger signs shall be inscribed with the equipment voltage level along with an
internationally recognized danger sign.