Electrical Safety
Learn about electrical safety measures, types of risks, and incidents to avoid when working with or near electricity. Stay informed to prevent accidents and maintain a safe environment. Ensure compliance and minimize hazards to protect yourself and others.
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Electrical Safety Igor Neuhold 15thSeptember 2023 EDMS reference
Electricity It starts with the electron... Georg Ohm 1789 -1854 Schr dinger Equation for the hydrogen atom U = R x I Ohm s law U = Voltage [V] I = Current [A] R = Resistance [ ] 2 Beamline for Schools 2023- Electrical Safety
Electricity It starts with the electron... Georg Ohm 1789 -1854 Schr dinger Equation for the hydrogen atom U = R x I Ohm s law U = Voltage [V] I = Current [A] R = Resistance [ ] 3 Beamline for Schools 2023- Electrical Safety
Electricity HVB Line CERN uses 1.3 TWh of electricity annually. That represents approximately a third of the consumption of the Canton of Geneva. TRANSMISSION HVB/HVB RTE/SIG 400 kV/130 kV 66 kV LHC 18 kV HVB/HVB DISTRIBUTION HVB/HVA LV 400 V HVA/LV 18 kV INSTALLATIONS Beamline for Schools 2023- Electrical Safety
Types of risk Electric contact Direct / Indirect Live parts Current route Current route Electrical Arc Electrical Fire 5 Beamline for Schools 2023- Electrical Safety
Types of risk- Electric shock: Direct and Indirect contact Direct contact Indirect contact Beamline for Schools 2023- Electrical Safety
Electrical arc By touching a cable to the battery, a short circuit was produced. It created an electric arc which burned the victim s right hand. Cable and battery in short circuit 7 Beamline for Schools 2023- Electrical Safety
Electrical Fire 8 Beamline for Schools 2023- Electrical Safety
Non-electrical work Non-electrical work can also lead to electrical accidents!!!!! When working near electricity, there is always a risk, which depends on the: type of activity; proximity. If the electrical risk cannot be eliminated, a Habilitation Electrique title is required. Drilling near live cables has significant risk. Incident at CERN: Drilling through a live cable 9 Beamline for Schools 2023- Electrical Safety
Electrical Hazards (at CERN) Beamline for Schools 2023- Electrical Safety
If you find an unsafe condition report it immediately !! In case of imminent danger, do not hesitate to contact CERN Fire & Rescue Service Do you know who to contact? 74444 +41 22 767 4444 11 Beamline for Schools 2023- Electrical Safety
Always check your equipment before performing any work. Always check your working environment before performing any work. 12 Beamline for Schools 2023- Electrical Safety
Ingress protection Direct contact Preventing direct contact: For low voltage equipment, IP2X is required. This means you cannot touch a live part with your finger. For high voltage equipment, IP3X is required. This means you cannot touch a live part with a finger or a tool. The X means that any water rating is ok, since we do not normally expect water in our experiments. Test Fingers 13 Beamline for Schools 2023- Electrical Safety
Grounding Indirect contact Earthing = Grounding earthing mm2 = phase conductor mm2 1 cable = 1 connection point Metallic doors to equipment racks shall also be earthed. High frequency equipment: particular attention is required to earthing! Do not remove earth cables unless the equipment is being dismantled. 14 Beamline for Schools 2023- Electrical Safety
Residual Current Devices- RCD RCD = Safety Equipment Residual Current Device D A N G E R O F D E A T H Source: IEC 60479-1 30mA RCD Time / current zones of the effect of AC current (15 Hz to 100 Hz) on the human body 15 Beamline for Schools 2023- Electrical Safety
CERN Specifics- Safety buttons AUL - Local Emergency Stop AUE - Equipment Emergency Stop AUG - General Emergency Stop Cuts power only locally (room/zone). Does not call the fire brigade. Cuts power to a piece of equipment or a single rack. Cuts all power in the vicinity and immediately calls fire brigade. Evacuation alarm Triggers evacuation sirens, immediately calls fire brigade. Does NOT cut electrical power. 16 Beamline for Schools 2023- Electrical Safety
CERNSpecifics - Safety equipment identification Special attention to the cabinet with orange stripes: they are not cut off by AUG or AUL. This is reserved for life safety functions and those systems where a power cut causes increased risk (e.g. gas racks, irradiation sources). Beamline for Schools 2023- Electrical Safety
PPE and tools Personal Protective Equipment (PPE) Protective Helmet Electrical SCEM 50.43.30.D Electrical Protection Gloves SCEM 50.43.20.EA NOMEX Jacket SCEM 50.45.10.A Safety shoes SCEM 50.43.10.A Beamline for Schools 2023- Electrical Safety 18
Consequences- Electrical Shock Check-up! D A N G E R O F D E A T H 74444 +41 22 767 4444 30mA RCD Time / current zones of effect of AC current (15 Hz to 100 Hz) on human body Source: IEC 60479-1 19 Beamline for Schools 2023- Electrical Safety
Rules Does CERN need to apply Electrical safety standards and if yes, which ones? As an intergovernmental organisation, CERN establishes its own safety rules as necessary for its functioning taking into account relevant Host States, as well as European and International regulations and standards. Electrical Safety Code C1 20 Beamline for Schools 2023- Electrical Safety
