Electrical Systems Design | My Assignment Tutor

2365 Level 3 Electrical Installations Candidate Pack 55Assessment 615: Electrical Systems DesignTask A – Design projectCandidate name:Date: Time allowedThere are no time constraints to this assignment however, it is estimated thatthe work involved should take approximately 20 hours.Task instructionsCandidates are required to successfully complete the following task consistingof 10 questions to achieve this assignment:Candidates are permitted any relevant reference material such as IET On-siteGuide, BS 7671 and internet access.Read all information relating to the task carefully before attempting anyquestions. For this task you will require a copy of drawings 5357-A1 to A6. Forthe purpose of scaling, these should be provided in A3 format. You may, whenmarking up drawings, use A4 format if desired.All questions must be completed for this project. You may use the spaceprovided for your answers or you may produce them electronically on separatenamed sheets. Read each question carefully before attempting.Drawings 5357-A1 to A6 show the proposed new hotel extension and newpool/café block. Information relating to building design and construction aredetailed below. You may however make reasonable assumptions throughoutyour design giving reasons. Candidate pre-assessment planI am aware of assessment requirements, criteria and time allocationCandidate signatureDate The task has been successfully completed to the standards requiredPersonPrint nameSignatureDateCandidateAssessorInternal qualityassurance(if required) 56 2365 Level 3 Electrical Installations Candidate PackAssessor/Tutor feedback to candidate on outcome of assessment (if applicable)2365 Level 3 Electrical Installations Candidate Pack 57Building SpecificationBuilding ConstructionHotel Extension:x The building is constructed on a concrete raft with 50 mm screed to the ground floor and chipboard on 100mm wooded joists for the first floor.x The walls are thermolite blocks with uPVC cladding, cavity and inner leaf blockwork with plaster finish. Innerwall partitions are blockwork with plaster finish.x The roof is tiled on a wooden roof truss with waterproof membrane.x Internal ceilings are plasterboard on the underside of wood joists.Pool/Café block:x The building is constructed on a re-enforced concrete base forming the swimming pool and floor with tiledfinish throughout the basement areas.x The first floor is pre-cast concrete on steel supports with 50 mm screed and non-slip vinyl finish.x The basement walls are re-enforced concrete with internal uPVC cladding.x The basement ceiling utilises the underside of the concrete floor above.x The café area walls are wood framed with uPVC outer cladding, thermal insulation and plasterboard innerlining.x The tiled roof is supported on exposed decorative wooden trusses with internal plasterboard infills on theunderside forming an open ’A’ roof space with the exception of the building section above the kitchen end ofthe building which has plasterboard ceilings 2.4 m above ffl forming an enclosed roof space above.x Inner walls are plasterboard partitions having aluminium frame.Electrical Installation:The existing hotel building forms part of a 400 V three-phase TN-C-S system. It has been assessed that there issufficient capacity for the new works and a new CCU will be installed to supply the new distribution circuits. Ze andPFC have been measured and recorded as 0.09 Ω and 5 kA respectively.It has been assessed that following installation of the new three-phase distribution circuit to the pool/café block,Zdb and PFC for the new distribution board within the block will be 0.11 Ω and 3.7 kA respectively.Fire alarm systemThis is to be installed by specialist contractors but a 13 A un-switched fused connection unit will be required in thepool/café block to supply a repeater panel.Heating, ventilation and air-conditioningThis is to be installed by specialist contractors and any supply details are contained in the design specification. Anyfurther considerations can be ignored.58 2365 Level 3 Electrical Installations Candidate PackDesign Specification DetailWithin the pool/café block, the following design criteria appliesAmbient temperatures All basement pool areas 40 °CCafé open area 25 °CCafé Kitchen/servery 35 °CWiring systems forlighting and small power(see additionalinformation below forspecific circuits)All basement pool areas PVC surface conduit with 90 °Cthermosetting single-core nonsheathed cablesCafé open area PVC surface conduit with 70 °Cthermoplastic single-core nonsheathed cablesCafé Kitchen/servery PVC surface conduit with 70 °Cthermoplastic single-core nonsheathed cablesGrouping of circuits forlighting and small power(see additionalinformation below forspecific circuits)All basement pool areas Each circuit will be grouped with nomore than 2 other circuitsCafé open area Each circuit will be grouped with nomore than 1 other circuitCafé Kitchen/servery Each circuit will be grouped with nomore than 3 other circuitThermal Insulation All areas No thermal insulation affects thewiring systemsCircuit lengths All areas To be estimated from drawingscales. For the purpose of thisproject, no circuit should exceedapproximately 30 m.Other circuit specificdetail230 V 16 A dishwasher in kitchen Supplied by a three core 70 °Cthermoplastic SWA cable clippeddirectServery food holding equipment. This unitrequires a 16 A 400 V three-phase andneutral supply.Supplied using five core 90 °Cthermosetting SWA cable clippeddirectAll pool equipment and sauna equipment.This equipment requires a 32 A 400 Vthree-phase and neutral supply. Allequipment associated will be installed by aspecialist from a local supply point in theSupplied using five core 90 °Cthermosetting SWA cable clippeddirect2365 Level 3 Electrical Installations Candidate Pack 59equipment room provided as part of thecontract.The four fridges within the kitchen areashould be supplied by two 16 A singlephase circuits to specifically labelledsocket-outlets for each fridge. Additionalprotection should be omitted for thesecircuits.Supplied by single-core 70 °Cthermoplastic non-sheathed cablein surface PVC conduitNew summer house by existing pool. A 32A distribution circuit from the pool/caféblock will supply this new structure whichwill have a four-way SP-N distributionboard fitted.Supplied by a three core 70 °Cthermoplastic SWA cable clippeddirect60 2365 Level 3 Electrical Installations Candidate PackAssessment 615: Electrical Systems DesignTask A – Design projectCandidate name:Date:Note: this question paper and associated drawings must be submitted for marking1 As part of the electrical contract, the client is considering an electric vehicle charging unit in the car parksupplied from the existing TN-C-S supply in the main hotel building. Following a site survey it has beendecided to install the EV Charging Equipment as part of a TT earthing arrangement.Draw a fully labelled circuit diagram illustrating the three-phase 400 V supply system and earthingarrangement from the sub-station transformer through to the charging unit. The diagram should showthe total earth fault loop path for the charging unit.Your diagram does not need to show the complete detail of distribution boards, metering or consumercontrol equipment although the diagram should, as a minimum, indicate a connection point for eachitem of equipment.2365 Level 3 Electrical Installations Candidate Pack 612 a) Select, using manufacturers’ data, suitable luminaires for all parts of the pool/café block withexception of the sauna. Your selection should be based onx energy efficiencyx environment/external influencesx aestheticsx Your selection does not need to take into consideration suitable levels of illuminationfor the purpose of this project or any outdoor lighting.b) Show, on either electronic or hard copies of the drawing, positions of socket-outlets and fusedconnection units for the new hotel block giving consideration to the following items ofequipment in each room:x kettlex TVx provision for phone charging and/or laptop usex supply to a 700 W air handling unit for heating/cooling (installed by specialist)x electric towel rail.c) Show, on either electronic or hard copies of the drawing, positions of the luminaires selectedgiving each type a suitable form of identification on a separate key.d) Show, on either electronic or hard copies of the drawing, how each circuit in the new hotelextension is to be arranged. The arrangement must take into account that a fault in any oneroom must not affect another room.e) Show, on either electronic or hard copies of the drawing, any further distribution boards thatmay be required in the hotel extension.f) Show, on either electronic or hard copies of the drawing, how each lighting circuit in the newpool/café block is to be arranged including switching.g) Give each circuit a unique form of identification.h) Complete the legend on the drawings using recognised symbols and descriptions for eachsymbol used on the drawings.3 Select, with the aid of manufacturers’ data, a suitable range of circuit protective devices for thiscontract. Your selection should be based on the following:x Prospective short circuit currentsx Requirements for additional protection and special locations.62 2365 Level 3 Electrical Installations Candidate Pack4 This question may be answered using the Table 1 or Table 2. It is strongly recommended that you usepencil when completing the table to allow for recalculation of figures.Determine, for every final circuit in the café/pool block, each of the following.a) Design current (Ib)b) Nominal rating and type of protective device (In)c) Method of installation referenced) Rating factors that applye) Minimum cross-sectional area of live conductors for current capacity and voltage dropf) Actual voltage drop.g) Maximum permissible disconnection time for each circuit as given in BS 7671.h) Earth fault loop impedancei) Maximum earth fault loop impedance as stated in BS 7671.5 Determine, for one of the circuits supplying the fridges, the minimum possible cross sectional area ofcpc which will satisfy the requirements disconnection as ADS under earth fault conditions and theadiabatic equation as Regulation 543.1.3 in BS 7671.2365 Level 3 Electrical Installations Candidate Pack 636 For this question, use the table below. More copies may be made as necessary.a) Determine the maximum demand for the pool/café block electrical installation before theapplication of diversity.b) Determine the maximum demand for the pool/café block electrical installation following theapplication of diversity. CircuitDemandDiversity factorDemand followingdiversityTotalTotal 64 2365 Level 3 Electrical Installations Candidate Pack7 Explain, with the aid of a diagram, how electric shock protection is provided by one of the shaver pointsin the hotel extension bathrooms using the Protective Measure: Electrical Separation.2365 Level 3 Electrical Installations Candidate Pack 658 List, using the box below, five typical extraneous conductive parts and five typical exposed conductiveparts that may be found within this entire complex. Typical Extraneous Conductive PartsTypical Exposed Conductive Parts 9 Complete the box below relating to earthing and bonding. Type of protective(earthing/bonding)conductorExample of where this may be found within thiscomplexMinimumpermissible csa asBS 7671 (whereapplicable)Main ProtectiveBondingWhere PMEconditions applyFor non-PMEapplicationsSupplementaryequipotentialbondingWithout mechanicalprotectionWith mechanicalprotectionFunctional earthEarthingConductorFor TT installationsFor TN installationscpcWithout mechanicalprotectionWith mechanicalprotection 66 2365 Level 3 Electrical Installations Candidate Pack10 Complete the box below relating to isolation and switching. Type of isolationor switchingExample of where this may be found within thiscomplexFurther requirementsIsolation forelectricalmaintenancepurposesRelating to securingsafe isolationSwitching formechanicalmaintenanceRelating to deviceswhich are not undereffective controlRelating to switchingcapabilityFunctionalSwitchingRelating to ratingwhere used fordischarge lighting 2365 Level 3 Electrical Installations Candidate Pack 67Assessment 615: Electrical Systems DesignAssignment feedback (if applicable)Candidate’s name:Assessor’s name: Tasks1st SubmissionOutcomePass/FailResubmissionOutcomePass/FailIQA Signature (ifsampled)Q1Q2Q3Q4Q5Q6Q7Q8Q9Q10Target date and action plan for resubmission (if applicable) 68 2365 Level 3 Electrical Installations Candidate PackAssessor/Tutor feedback to candidate on outcome of resubmission

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