SM-Incidents involving electricity Flashcards
Hazards associated with elec..
Illegal activity and overload
Residual charges
Damaged equipment - Reduced insulation etc
Fire involving - oil, hazardous substances, fuel storage, explosion..etc
At elec incident, prior to power being turned off…
Do not attemt rescue, or gaining access or apply water..
Request urgent attendance of ‘electricity company representative’
You may need to secure a water supply for use of foam, consider containing the water run off and informing the EA.
The walls and floors separating the transformer chamber/sub station from the rest of the building will have a certain amount of fire resistance…?
4 hours - Situated on an outside wall.
Elec
Ok to remove inspection covers..?
Oil filled transformers and switchgear may fail without warning and explode..
Nope
Contact ____ for overhead cables?
If there is any possibility that high voltage might be present no entry into the risk area should be made.
If low voltage then action can be taken, with controls in place.
National grid
Water may be applied when it is confirmed that only low voltage supplies are involved.
Do carbon dioxide and vaporising liquids damage electrical equipment?
UPS..?
Nope
Uninterruptible power supplies
Electrical gloves to be used at____?
If someone lying on top of a transformer, switch or anywhere else above ground level they must not be touched.
High voltage apparatus is seldom located less than____m above ground?
If voltage known to be less than 3300V
2.5m
High voltage?
Battery bank
Greater than 1000 volts (1500 volts DC)
Means of providing an auxiliary power source
Rescues involving elec
Min safe distance
When carrying out a rescue in the vicinity of overhead lines, substations and other elec equipment
Not using hose
When using ladders etc
In dense smoke without hose
With hose
Hand held jets
Ground/aerial monitors
5metres
10m or 20m training
10m
20m
30m
PCB (Polychlorinated Biphenyls), used in some transformers & other electrical equipment as___?
In what way are they harmful?
An insulating liquid.
Highly toxic, not biodegradable, harmful to environment
Some are labelled to indicate they contain PCBs
What is SF6 and what level of PPE is required to deal with it?
Sulphur Hexafluoride - Used as an insulating and interrupting medium in some electrical apparatus.
BA must be worn - consult HMEPO
Wind turbine sites - What should you request to ensure a SSOW?
Recommended cordon at a wind turbine fire involving the nacelle or at height?
Blades to be ‘locked out’ - this does not remove the electrical risk posed by the turbine.
300m
Attendance time for authorised person?
Up to two hours - available 24/7, id on them
Ok to use ladders and aerial appliances at external substations?
Not without the assurance of the authorised person that it is safe to do so
If using ladders or aerial appliances close to overhead power cables, guidance must be sought from the authorised person & equipment kept at least___m from them.
10m - Pat attention to weather conditions also
Safety Officers
