SI347001_MNL Fluorobenzene Manual

Simon Storage, Fluorobenzene Gantry / Tank 24

Instrument & Electrical Installation Tender Package

DOCUMENT REF: SI347001.INS

ISSUE: B DATE: 13.10.97

PAGE: 7 OF 23

2.7

Clean Up

During and on completion of installation work the Contractor shall remove all surplus

equipment and material and leave areas in a 'brush clean' condition. Refuse shall be

disposed of as directed by the Engineer.

Prior to testing (where damage could arise) and before offering any part of the installation

for acceptance, the Contractor shall clean out all electrical enclosures and wipe down

painted surfaces. If necessary, damage to paintwork shall be made good by touch-up.

Before finally leaving the site, the Contractor shall remove all his accommodation, plant,

tackle and tools of the trade to the satisfaction of the Engineer.

2.8

Earthing

2.8.1

General Soil Conditions

No information is available.

2.8.2

System Earthing

The neutral shall not be regarded as an earth conductor.

In areas where earth rods are to be driven into the ground, it shall be the contractors

responsibility to ensure that there are no other underground services in the immediate

vicinity.

2.8.3

Equipment Earthing

The main earthing bar on the MCC is connected by a separate earth conductor to its main

earth point. All non-live metalwork shall be directly or indirectly bonded to the Main Earth

Bar within the MCC. Such metalworks will include electrical equipment enclosures, motor

frames, tray/ladder rack to be continuously bonded, cable armouring and glands. All glands

which are through clearance holes require an earth tag and connection to the earth system

by 6

cable. Care must be taken to ensure that paint, etc. is cleaned away from under

earth connections so that there is good earth continuity.

Direct bonding shall be taken to mean dedicated earth conductors within, or separate from,

plant cable. Separate conductors shall be multi-stranded copper with a green/yellow sheath,

size as specified in the drawings. Indirect bonding shall be taken as earth paths through

armouring.

Note

: (Dedicated earth conductors preferred).

However, a combination of both may be employed, providing that the value of the earth

loop impedance allows flow of fault current sufficient to rupture associated protective

fuses within five (5) seconds.