ABB UCL Installation And Commissioning Manual page 3

Recommended practices
ABB recommends careful consideration of the following
factors when installing on-load tap-changers:
Before you install or commission a unit, make sure that the
personnel doing the job have read and fully understood the
installation and commissioning guide provided with the unit.
To avoid damaging the unit, never exceed the operating limits
stated in delivery documents and on rating plates.
Do not alter or modify a unit without first consulting ABB.
Follow local and international wiring regulations at all times.
Use only factory authorized replacement parts and
procedures.
Safety warnings
The following warnings and notes are used in the manual:
WARNING
WARNING indicates an imminently hazardous
situation, which if not avoided will result in death or
serious injury. This signal word is to be limited to the
most extreme situations.
WARNING also indicates a potentially hazardous
situation, which if not avoided could result in death or
serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation,
which if not avoided may result in minor or moderate
injury. It may also be used to alert of unsafe practices.
CAUTION may also indicate property-damage-only
hazards.
INFO provides additional information to assist in
carrying out the work described and to provide
trouble-free operation.
Safety precautions
WARNING
Unused transformer oil is harmful. Fumes from
unused warm oil may irritate the respiratory organs
and the eyes. After long and repeated contact with
transformer oil, skin becomes very dry.
Used tap-changer oil from diverter switch housings
and selector switch housings contains harmful
substances. Fumes are irritating to the respiratory
organs and the eyes and are highly flammable. Used
transformer oil may well be carcinogenic.
Avoid contact with the oil and use oil-tight protective
gloves when handling the oil.
First aid:
Skin contact: Wash your hands. Use skin cream to
counteract drying.
In the eyes: Rinse your eyes in clean water.
Swallowing: Drink water or milk. Avoid vomiting. Call
a doctor.
Collect used oil in oil drums.
Waste and clean-up: Should be absorbed by an
absorber. Treat it as hazardous to the environment.
In the event of fire: Any fires should be extinguished
with powder, foam or carbonic acid extinguishing
agents.
WARNING
Be aware of the risk for slipping caused by oil spillage,
for instance when working on the transformer cover.
WARNING
The motor-drive mechanism must not be installed in
an explosive atmosphere. The electrical equipment
creates sparks that can cause an explosion.
WARNING
Before any work is carried out on the tap-changer:
Make sure that the transformer is disconnected and
that grounding is properly conducted. Obtain a signed
certificate from the engineer in charge.