/20 8 votes, 4.1 avg PAT Testing Basics Inspecting and Testing of Electrical Equipment (PAT Testing) isn't just about electricity. Anybody carrying out the role needs a good understanding of electrical equipment in general and knowledge of the terminology we use. If you are new to the role, this quiz may be quite challenging. If you are experienced, it should be straight forward. 1 / 20 When carrying out an Earth Continuity Test on a Class I appliance, what could be considered an acceptable test result and an instant 'PASS'? ≥0.10Ω ≥1.00MΩ =1.00Ω ≤0.10Ω We want the resistance of the earth path to be a little as possible, so a perfect test result would be 0.0Ω. As a perfect result is unrealistic, we have a tolerance of ≤0.10Ω... i.e. up to and including 0.10Ω is acceptable We want the resistance of the earth path to be a little as possible, so a perfect test result would be 0.0Ω. As a perfect result is unrealistic, we have a tolerance of ≤0.10Ω... i.e. up to and including 0.10Ω is acceptable 2 / 20 What happens to the supply voltage when more items are switched on? It increases slightly It remains constant We don't know, it cannot be measured It decreases slightly The supply voltage is influenced by a number of factors, including the number of items being fed by the supply. The more items we switch on, the lower the voltage will go The supply voltage is influenced by a number of factors, including the number of items being fed by the supply. The more items we switch on, the lower the voltage will go 3 / 20 Which of the pieces of information on a flex indicate how many conductors it has? 1.0mm² NSW24982 H05VV-F 3G "H05VV-F" - for indoor mobile installations and household appliances with medium mechanical strain. "3G" - 3 conductors. "NSW24982" - product code. "1.0mm² " - the cross sectional area of each conductor. "H05VV-F" - for indoor mobile installations and household appliances with medium mechanical strain. "3G" - 3 conductors. "NSW24982" - product code. "1.0mm² " - the cross sectional area of each conductor. 4 / 20 An Extra Low Voltage item is characterised by which one of the following? An input of mains voltage with basic insulation around live parts, with a connection to the earthing provision of the building An input voltage of up to 50Vac or 120Vdc An input of mains voltage with basic and supplementary insulation around live parts An input of mains voltage with basic insulation around live parts By definition, an Extra Low Voltage item has a reduced input voltage and is not powered by the mains supply By definition, an Extra Low Voltage item has a reduced input voltage and is not powered by the mains supply 5 / 20 Which of the following BS1362 plug fuses are currently available? 4 Amp 3 Amp 8 Amp 12 Amp BS1362 plug fuses are available in the following ratings: 1 Amp, 2 Amp, 3 Amp, 5 Amp, 7 Amp, 10 Amp and 13 Amp BS1362 plug fuses are available in the following ratings: 1 Amp, 2 Amp, 3 Amp, 5 Amp, 7 Amp, 10 Amp and 13 Amp 6 / 20 The electrical tests on a Class I item are carried out in which order? Function - Earth continuity - Insulation resistance - Current leakage Earth continuity - Insulation resistance - Current leakage - Function Current leakage - Earth continuity - Insulation resistance - Function Insulation resistance - Earth continuity - Current leakage - Function The function check is always carried out last, as we cannot energise the item before we have ensured it is electrically safe. The earth continuity test is carried out first as we need the earth path for the insulation resistance test. The function check is always carried out last, as we cannot energise the item before we have ensured it is electrically safe. The earth continuity test is carried out first as we need the earth path for the insulation resistance test. 7 / 20 Effective insulation must have high resistance False True The insulation is acting as a barrier to keep the user away from live parts. Therefore, the higher the resistance, the more effective it will be as a barrier. The insulation is acting as a barrier to keep the user away from live parts. Therefore, the higher the resistance, the more effective it will be as a barrier. 8 / 20 Power is defined as... "the rate of change of resistance in a circuit" "the rate of change of voltage in a circuit" "the rate of change of energy in a circuit" "the rate of change of current in a circuit" Energy cannot be made or destroyed, but it can be changed from one for to another, for example, electrical energy to heat Energy cannot be made or destroyed, but it can be changed from one for to another, for example, electrical energy to heat 9 / 20 What unit is current measured in? Volts Ohms Watts Amps Current - Amps EMF / Potential Difference - Volts Resistance - Ohms Power - Watts Current - Amps EMF / Potential Difference - Volts Resistance - Ohms Power - Watts 10 / 20 Which of the following televisions has been constructed as Class II? Television (c) Television (b) Television (a) Television (d) The only recognised way of identifying whether an item of electrical equipment has been designed as Class II is to look for the Class II construction mark The only recognised way of identifying whether an item of electrical equipment has been designed as Class II is to look for the Class II construction mark 11 / 20 How does a Class II item protect the equipment user? It always has a power rating of less than 20W It has basic insulation around live parts and a connection to the earthing provision of the building It has 2 layers of insulation around live parts It has a supply voltage of up to 50Vac or 120Vdc The key 'safety feature' of a Class II item is two distinct layers of insulation (or one layer of reinforced insulation) around live parts. Also known as double insulated. The key 'safety feature' of a Class II item is two distinct layers of insulation (or one layer of reinforced insulation) around live parts. Also known as double insulated. 12 / 20 High resistance in an earth path is a good thing Sometimes It doesn't matter False True An earth path is designed to take fault current to ground and away from the equipment user. Resistance in an earth path will affect its effectiveness putting the equipment user at risk. As electricity will always take the path of least resistance, low resistance in the earth path is always required. An earth path is designed to take fault current to ground and away from the equipment user. Resistance in an earth path will affect its effectiveness putting the equipment user at risk. As electricity will always take the path of least resistance, low resistance in the earth path is always required. 13 / 20 Which one of the following is the Class II construction mark? Class II .....(d) Class II .....(c) Class II .....(a) Class II .....(b) The 'box inside a box' symbol represents 2 layers of insulation The 'box inside a box' symbol represents 2 layers of insulation 14 / 20 If an appliance has a power rating of 550W, according to the industry standard, how much current will it draw? 13 Amps 3 Amps 3 Volts 5 Amps The industry standard states that an item with a power rating of up to 700 Watts will draw up to 3 Amps. From 701 Watts to 3,000 Watts it will draw up to 13 Amps. The industry standard states that an item with a power rating of up to 700 Watts will draw up to 3 Amps. From 701 Watts to 3,000 Watts it will draw up to 13 Amps. 15 / 20 What does the cord grip of the plug secure? The live and neutral conductors The cable sheath The live, neutral and earth conductors The live conductor The cord grip is designed to secure the cable sheath (the outer layer of insulation on the power cord) whilst reducing the risk of fatigue on the conductors inside The cord grip is designed to secure the cable sheath (the outer layer of insulation on the power cord) whilst reducing the risk of fatigue on the conductors inside 16 / 20 Which test voltage should be used when carrying out an Insulation Resistance Test on a surge protected extension lead? 500Vac 250Vdc 250Vac 500Vdc Insulation Resistance Testing is always carried out with Direct Current (dc). Surge protection is designed to protect against higher voltages, so if we test using 500Vdc, we will trigger the surge protection, so 250Vdc is used. Insulation Resistance Testing is always carried out with Direct Current (dc). Surge protection is designed to protect against higher voltages, so if we test using 500Vdc, we will trigger the surge protection, so 250Vdc is used. 17 / 20 What does a typical Class I item have, which a Class II item doesn't? Earth path to the earthing provision of the building A supply voltage of less than 50Vdc Multiple layers of insulation A BS1362 fuse in the plug By definition, a Class I item has a connection to the earthing provision of the building. Class II is double insulated and doesn't have an earth. By definition, a Class I item has a connection to the earthing provision of the building. Class II is double insulated and doesn't have an earth. 18 / 20 If an electrical item has a cord rated at 6 Amps, which of the following BS1362 fuses could be used to protect the cord 10 Amp & 13 Amp 3 Amp & 5 Amp 3 Amp & 13 Amp 5 Amp & 13 Amp The BS1362 fuse is designed to protect the cord. Therefore, the fuse has to be of a lower rating than the cord to ensure it blows before the cord sets on fire The BS1362 fuse is designed to protect the cord. Therefore, the fuse has to be of a lower rating than the cord to ensure it blows before the cord sets on fire 19 / 20 Assuming a 230V supply, a 2.3kW heater actually draws how many amps? 13 Amps 10 Amps 5 Amps 3 Amps Power / Voltage = Current 2300W / 230V = 10 Amps Power / Voltage = Current 2300W / 230V = 10 Amps 20 / 20 Extra Low Voltage items have an input voltage of up to...? 230Vac or 120Vdc 50Vac or 230Vdc 50Vac or 120Vdc 50Vdc or 120Vac Extra Low Voltage (ELV) items are powered by a stepdown transformer or switch-mode power supply with a reduced output of up to 50Vac or 120Vdc Extra Low Voltage (ELV) items are powered by a stepdown transformer or switch-mode power supply with a reduced output of up to 50Vac or 120Vdc Your score is The average score is 79% 0% Restart quiz Exit Send feedback
