Bāze, 8. Nodaļa

When encountering unidentified cables, pipelines, or other underground communications, it is important to stop work until the situation is clarified. This is necessary to ensure the safety of the workers and to prevent any potential damage or accidents. It is crucial to assess the situation and determine the nature and purpose of these unidentified elements before proceeding with any further work.

Ogļskābes un pulvera ugunsdzēšamais aparāts ir piemērots izmantot ugunsgrēku elektroiekārtās zem sprieguma līdz 1000 V. Šāds aparāts nodrošina efektīvu ugunsdzēsību, neizraisot elektrošoku vai citus riskus, kas varētu būt saistīti ar ūdens vai citu dzēšanas līdzekļu izmantošanu elektroiekārtās.

The correct answer is 3. Jāatbrīvo cietušais ar sausu elektroizolējošu materiālu. This means that the person should be freed using a dry electrical insulating material. This is because an electrical insulating material will help to prevent the transfer of electricity and protect the rescuer from getting electrocuted while freeing the victim.

The maximum allowable voltage for an electrical tool that can be used in indoor spaces without increased danger is 220V.

When working with electrical installations with a voltage of 6/20 kV, the outer boundary of the active work zone for a person is 0.6m.

The correct answer states that "soļa spriegums" refers to the potential difference between two points on the ground surface that are a step distance apart within the leakage current zone. This means that the answer is explaining that "soļa spriegums" is the voltage difference between two points on the ground that are close enough for current to leak through.

The correct answer is 3 because measuring the voltage between phases and between each phase and neutral using a voltmeter is a reliable method to determine the absence of voltage in low voltage electrical installations. By measuring the voltage, it can be confirmed whether there is any electrical potential difference present or not. This method ensures safety by verifying that there is no voltage before performing any maintenance or repair work on the electrical system.

In the given ABC scheme, the relationship between rescue breaths and chest compressions is 2 rescue breaths to 30 chest compressions. This means that for every 2 rescue breaths administered, 30 chest compressions should be performed.

Wood stairs can be painted with a transparent lacquer to enhance the natural beauty of the wood while providing protection against wear and tear. This allows the grain and color of the wood to show through while adding a glossy finish.

If a person approaches the live parts of a 20 kV electrical installation at a distance less than the permissible distance, an electrical arc can form between the live parts and the person. This can result in a dangerous situation as the electrical arc can cause burns, injuries, and damage to equipment. It is important to maintain the recommended distance to ensure safety and prevent accidents.

The correct answer is 2. Divi.

The minimum depth at which the electrode should be driven into the ground when creating a local portable ground is at least 0.5 meters.

The correct answer is 4 because the question is asking where the worker should be positioned when working on the corner supports of an overhead line. Being positioned on the outside of the angle allows for better visibility and maneuverability while working on the supports.

The correct answer is 4. 5 - 25mA. This is because the question is asking for the peak current in an alternating current (AC) circuit with a frequency of 50 Hz. In an AC circuit, the current continuously changes direction, reaching a maximum value in one direction and then reversing to reach a maximum value in the opposite direction. The peak current is the maximum value of the current in either direction. The range given in the answer options (5 - 25mA) indicates that the peak current can vary within this range.

The correct answer is "Tās īslaicīgi sazemējot". This means that the electrical parts should be temporarily grounded. Grounding helps to discharge any residual electrical charge and ensures safety when working with electrical components. By temporarily grounding the parts, any potential electrical energy is safely dissipated, reducing the risk of electrical shock or damage to the components.

The correct answer is "Neslēgt" which translates to "Do not close" in English. This safety sign should be placed on a switched off power switch to indicate that it should not be turned on.

Based on the given information, the air temperature is 40°C and the relative humidity is 80%. These conditions indicate a high risk of electrical hazards, such as overheating and potential short circuits. Therefore, the correct answer is "Īpaši bīstamas telpas" (especially dangerous rooms), as these conditions pose a significant risk for electrical safety.

The answer suggests that the inscription on the electricity meter's data plate indicates that the nominal current is 20A and the overload current can reach up to 120A.

The correct answer is "Spriegums virs 12V." This is because a voltage above 12V can be considered dangerous to human life. Voltages below 12V are commonly found in household electrical devices and are generally considered safe. However, voltages above 12V can cause electric shock, injury, or even death if proper precautions are not taken. Therefore, it is important to be cautious when dealing with voltages above this threshold.

The correct answer is option 3 because it defines an electrical installation or its part that is voltage-active or can be supplied with voltage by switching devices. This means that it is referring to an electrical device or its component that can be energized and operated by connecting it to a power source through switching apparatus.

The correct answer is KVA. KVA stands for kilovolt-ampere, which is a unit used to measure the apparent power or the total power in an electrical circuit. In the context of a 6-20/0.4 kV transformer, the power capacity or output is typically measured in KVA. This unit takes into account both the voltage and current in the circuit, providing a measure of the total power available.

Rokas elektroinstrumentu pārbaudes termiņi ir reizi 6 mēnešos. This means that hand power tools should be checked every 6 months.

The correct answer is option 2, which states that an additional electrical protection device for equipment with voltage up to 1000V is an insulated container, rubber caps, and portable grounding. This means that to protect equipment from electrical hazards, it is necessary to use insulated containers, rubber caps, and portable grounding devices to prevent electric shocks and ensure safety.

The correct answer is 2. 100mA. This is because the question is asking for the magnitude of the deadly alternating current. A current of 100mA is considered to be lethal to humans, as it can disrupt the normal functioning of the heart and other vital organs.

The correct answer is 2. 0,6m. The boundary of the electrical hazard zone when working on 0,4 kV overhead lines with climbing mechanisms is 0,6m.

An ampere meter measures the effective value of an alternating current. The effective value, also known as the root mean square (RMS) value, represents the equivalent direct current that would produce the same heating effect in a resistor as the alternating current. It is the most accurate representation of the current's magnitude and is commonly used in electrical measurements and calculations. Therefore, an ampere meter will display the effective value of an alternating current when connected in an AC circuit.

The maximum allowable voltage for working with electrical tools in hazardous environments is 42V. This is because higher voltages can pose a greater risk of electric shock or other electrical hazards. Working with lower voltages, such as 12V or 6V, would be safer but may not provide enough power for certain tools. The standard household voltage of 220V is too high for working in hazardous environments and could be extremely dangerous.

The answer is 3. 3. klases because it states that 3. klases (3rd class) hand-held power tools can be used in potentially dangerous areas. This implies that only hand-held power tools from the 3rd class are allowed in such areas, while those from the 1st and 2nd class may not be suitable or safe for use in those environments. The option "Visa veida" (all types) is incorrect because it suggests that any class of hand-held power tools can be used in potentially dangerous areas, which may not be true.

The maximum allowable voltage for working with electrical tools in particularly dangerous spaces is 12V. This is because higher voltages can increase the risk of electrical shock and other hazards in such environments. Lowering the voltage to 12V helps to mitigate these risks and ensure the safety of individuals working in these spaces.

The maximum working voltage in places with increased electrical hazard is 42V.

The correct answer states that all basic protective measures are applicable up to 1000V. This means that any protective equipment or devices such as isolating rods, indicators, voltage indicators, phase detectors, safety belts, helmets, safety goggles, and posters are effective for voltages up to 1000V. However, options 2, 3, and 4 mention specific types of equipment or protective measures that may not be suitable for voltages above 1000V.

The instruments with insulated handles should be tested for a voltage of 2500V. This means that the instruments should be able to withstand a voltage of 2500V without any damage or malfunction. This test is important to ensure the safety of the user and to prevent any electrical accidents or hazards.

The correct answer is 4 because it includes all the necessary protective equipment for working with electrical devices up to 1000 V. Gloves, insulating rods, indicators, voltage testers, and phase detectors are all essential for ensuring safety and preventing electrical accidents. The other options either do not include all the necessary equipment or include items that are not relevant to electrical safety.

The correct answer is 3. Izolējošie stieņi, indikatori, sprieguma uzrādītāji, fāzējuma noteicēji. This answer includes the necessary safety equipment for working with electrical devices that have a voltage above 1000 V. Isolating rods are used to handle live electrical parts safely, indicators and voltage testers are used to measure and detect voltage levels, and phase detectors are used to determine the phase of the electrical current.