Page 295 - Offshore Electrical Engineering Manual

282 CHAPTER 1 Installation Practice

Where safety guards are provided with the machinery, these should be fitted
before any rotation of the equipment under power. The guards should be constructed
so as to facilitate removal. Location of both equipment and the guards on the equip-
ment should be such that access for inspection and maintenance is practicable and
safe. Both guards and couplings between motors and machinery should be removable
without requiring removal of the motor or the driven equipment. Where guards are
over belts and pulleys, a check should be made that the belt does not slap the guard
at any speed. This is particularly important with variable-speed drives. In hazardous
areas, nonsparking, antistatic belts must be used. Before any rotating equipment is
commissioned offshore, the following precautions should be taken.

1. All necessary tools and ancillary equipment should be convenient to hand but
not placed so as to pose a safety hazard.
2. Notices relating to firefighting procedures and treatment of electrical shock and
burns should be displayed in switchrooms and control rooms.
3. All normal working and warning notices for the equipment should be if they are
clearly visible.

LIGHTING AND SMALL POWER
During the design phase, calculations should have been carried out in order to fix
types, light outputs and locations of all the luminaires to be installed, and if the
required lighting levels are to be obtained, the installers must, wherever possible,
adhere to the design details provided. This will not always be possible, particularly in
congested areas, and to avoid shadow or obstruction of walkways, etc., an optimum
location should be chosen by the installer.
Being, for obvious reasons, conspicuous, the acceptable appearance of luminaires
should be preserved by careful installation, especially in accommodation areas. Rows
of fittings should be installed accurately in a straight line and fastenings and suspen-
sions set up rigidly so as to avoid distortion by handling during normal maintenance.
The colour rendering of tubes and lamps should be consistent and suitable for the
area where installed.
It is important both for balanced loading of phases and for ease of future identifi-
cation that luminaires, power sockets and distribution boards are wired in accordance
with design circuit schedules provided.
Care should be taken to ensure that polarities are correct when making connec-
tions to switches, convenience sockets, lamp holders and similar items.
When cabling up to swivelling floodlights, enough cable should be provided to
allow the floodlight to be swivelled a full 360 degrees.
In some cases, luminaires with integral emergency batteries are provided with
batteries unfitted. The batteries should be fitted as soon as possible to avoid deterio-
ration, especially if the battery housing is required to seal the luminaire enclosure.
Immediately after installation, the luminaires should be provided with a suitable elec-
trical supply (even if this supply is temporary) for a continuous period of 80–100 h to
ensure their batteries are fully charged.