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Electric Guidelines


Electrical Safety - What is a safe power source? 117 v domestic operating voltage from service line and may range from 105-130 v.
Electrical Safety - How is leakage current controlled? Instruments such as ground wires.
Electrical Safety - What is Stray Capacitance? The most common leakage current and is found in power cords, power supply, or wiring inside a machine. It is increased by extension cords.
Electrical Safety - What is Stray Inductance? Another source of leakage current. AC passing through an inductor creates an electromagnetic field which expands and collapses.
Electrical Safety - The power supply voltage should be what? 100-240 B.
Electrical Safety - The power supply frequency should be what? 50-60 Hz.
Electrical Safety - The Power consumption (not including the computers) should be what? 20 W.
Electrical Safety - The PC must not be situated closer than what from a patient. 1.5 m.
Electrical Safety - Impedance: The instrument provides high quality EEG recording if the resistance is less than 20 kΩ; it is recommended to achieve resistance less than 10 kΩ, and in a case of strong radio interference – less than 5 kΩ.
Electrical Safety - Input Impedance: Not less than 200 MΩ.
Electrical Safety - What is a fault circuit? One that will allow current to pass safely (harmlessly) to the ground.
Electrical Safety - What is a ground loop? Two instruments interconnected by a common ground and another connection between made up of a magnetic radiation in it's vicinity to complete the loop.
Electrical Safety - What is shock? Current that can be harmful or fatal.
Electrical Safety - What is macroshock? A large and perceptible current passing from one external surface to another.
Electrical Safety - What is microshock? A very low current that can sometimes still be lethal.
Electrical Safety - What color is the hot wire? Black.
Electrical Safety - What color is the neutral wire? White.
Electrical Safety - What does the neutral wire do? It returns the current to the transformer.
Electrical Safety - What color is the ground wire? Green.
Electrical Safety - In a 2 wire system, what can happen to the neutral wire? It 'acts' like a ground wire but may still have small voltage relative to building.
Electrical Safety - What happens when you use an extension cord? It can increase the voltage in a neutral wire.
Electrical Safety - What is the greatest danger to a 2 wire system? Accidental short circuiting that can cause severe shock, burn, or even death if ground and case touch at the same time.
Electrical Safety - What does a 3 wire system prevent and how? Accidental short circuiting because voltage returns directly to the ground.
Electrical Safety - What are the leakage current limits? For ground to chassis was 300 microamperes, (300 μA). Depending on the specific medical device, leakage current limits are as low as 10 μA.
Electrical Safety - What helps in not having excessive leakage currents? Ground wires.
Electrical Safety - Where do you find the most leakage current? In power supply or power cords.
Electrical Safety - Where else can you find leakage current? In the wiring of the machine.
Electrical Safety - What is stray inductance? Another source of leakage current. AC passing through an inductor creates an electro-magnetic field, which expands and collapses.
Electrical Safety - What happens when you connect 2 grounds on a pt? It causes a difference in voltage between the two grounds and the current can flow through the pt.
Electrical Safety - What is a ground loop? Two instruments with a common ground that produce magnetic fields that the pt or others will close circuit if connected between.
Electrical Safety - What helps prevent ground loops? Putting outlets in cluster at the same ground points.
Electrical Safety - What is a redundant ground? A separate heavy gauged wire attached to the case of a machine with the other end attached to a drain pipe.
Electrical Safety - What can help with 60 Hz interference? Grounding to the pt's bed.
Electrical Safety - What type of shocks do you get with DC? Shocks that may cause a skin burn.
Electrical Safety - What type of shock do you get with AC? A lethal shock.
Electrical Safety - When is a microshock lethal? When applied to legs and arms or introduced directly into the heart.
Electrical Safety - What are the 3 situations when using electrical instruments that pts are at risk? When involving high risk pts such as neos or O2, when using a single electrical instrument, and using electrical equipment that is not connected to the pt.
Electrical Safety - How can a pt get a shock from electrodes on the scalp? By not using optical isolators to separate the main power circuitry from the patient in the differential amplifiers. The separation prevents the possibility of accidental electric shock.
Electrical Safety - What is the meaning of Ohm's Law? The law related to electricity and states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance.
Electrical Safety - What is the formula for Ohm's Law? I=V/R where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms. R is independent of the current.
Created by: kmburg5840
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