|Assignment Title:||2365 Level 3 Unit 615 Task A|
|Submission Deadline Date||23rd November 2017||Issue Date:|
|Time allowed There are no time constraints to this assignment however, it is estimated that the work involved should take no more than 20 hours. Task instructions Candidates are required to successfully complete the following 1 task consisting of 10 questions to achieve this assignment: Candidates are permitted any relevant reference material such as IET On-site Guide, BS 7671 and internet access. Read all information relating to the task carefully before attempting any questions. For this task you will require a copy of drawings 5357-A1 to A5. For the purpose of scaling, these should be provided in A3 format. You may, when marking up drawings, use A4 format if desired. All questions must be completed for this project. You may use the space provided for your answers or you may produce them electronically on separate named sheets. Read each question carefully before attempting. Drawings 5357-A1 to A5 show the proposed new hotel extension and new pool/café block. Information relating to building design and construction are detailed below. You may however make reasonable assumptions throughout your design giving reasons. You should have the following for this task: access to research tools, including the internet drawings 5357-A1 to A5 writing materials a scientific calculator (graphical and programmable calculators are not permitted).|
Read the following specifications in conjunction with the drawings and then complete all questions in this task. This task may be completed using resources available such as reference books or the internet.
Drawings 5357-A1 to A5 show Proposed new hotel extension and café with basement swimming pool which is to undergo major refurbishment includes a total rewire of the premises (new wiring, accessories and appliances). You are involved in the design, installation and commissioning of the electrical installation. You may make reasonable assumptions in your project work consistent with economic considerations and conducive to the most practical design solutions. A list of these assumptions, with reasons, must appear in the folder or binder, with your project.
Whilst the use of manufacturers’ catalogues and data is encouraged, your project work should not involve any design from external sources. To complete the task, a combination of drawings/overlays/copies may be used. Computer aided design packages may be used providing that you gather and input any data required yourself.
The drawings show the minimum detail to enable this project to be completed and therefore may omit detail which may be common on other electrical installations. This task is open book and you are allowed to bring in research notes.
|Candidate pre-assessment plan|
|I am aware of assessment requirements, criteria and time allocation|
|Candidate Name:||JAIESH VARSANI|
|Candidate ID Number:||9500158803|
|THE TASK HAS BEEN SUCCESSFULLY COMPLETED TO THE STANDARDS IDENTIFIED|
|INTERNAL QUALITY ASSURANCE|
|Assessor/Tutor feedback to candidate on outcome of assessment (if applicable)|
|Building Specification Building Construction|
The building is constructed on a concrete raft with 50 mm screed to the ground floor and chipboard on 100 mm wooded joists for the first floor.
The walls are thermalite blocks with uPVC cladding, cavity and inner leaf blockwork with plaster finish. Inner wall partitions are blockwork with plaster finish.
The roof is tiled on a wooden roof truss with waterproof membrane. Internal ceilings are plasterboard on the underside of wood joists.
The building is constructed on a re-enforced concrete base forming the swimming pool and floor with tiled finish throughout the basement areas.
The first floor is pre-cast concrete on steel supports with 50 mm screed and non-slip vinyl finish. The basement walls are re-enforced concrete with internal uPVC cladding.
The basement ceiling utilises the underside of the concrete floor above.
The café area walls are wood framed with uPVC outer cladding, thermal insulation and plasterboard inner lining.
The tiled roof is supported on exposed decorative wooden trusses with internal plasterboard infills on the underside forming an open ’A’ roof space with the exception of the building section above the kitchen end of the building which has plasterboard ceilings 2.4 m above ffl forming an enclosed roof space above.
Inner walls are plasterboard partitions having aluminium frame.
The existing hotel building forms part of a 400 V three-phase TN- C-S system. It has been assessed that there is sufficient capacity for the new works and a new CCU will be installed to supply the new distribution circuits. Ze and PFC 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 system
|Design Specification Detail|
|Within the pool/café block, the following design criteria applies-|
|All basement pool areas||40 0C|
|Café open area||25 0C|
|Café Kitchen/servery||35 0C|
|Wiring systems for lighting and small power (see additional information below for specific circuits)||All basement pool area||PVC surface conduit with 900C thermosetting single-core non- sheathed cables|
|Café open area||PVC surface conduit with 70 0C thermosetting single-core non- sheathed cables|
|Café Kitchen/servery||PVC surface conduit with 70 0C thermosetting single-core non- sheathed cables|
|Thermal Insulation||All areas||No thermal insulation affects the wiring systems scales. For the purpose of this approximately 30 m|
|Circuit lengths||All areas|
|Other circuit specific detail||230 V 16 A dishwasher in kitchen||Supplied by a three core 70 0C thermoplastic SWA cable clipped direct|
|Servery food holding equipment. This unit requires a 16 A 400 V three-phase and neutral supply.||Supplied using five core 90 0C thermosetting SWA cable clipped direct|
|All pool equipment and sauna equipment. This equipment requires a 32A 400 V three-phase and neutral supply. All equipment associated will be installed by a specialist from a local supply point in the equipment room provided as part of the contract||Supplied using five core 90 0C thermosetting SWA cable clipped direct|
|The four fridges within the kitchen area should be supplied by two 16 A single-phase circuits to specifically labelled socket-outlets for each fridge. Additional protection should be omitted for these circuits||Supplied by single-core 70 0C thermoplastic non-sheathed cable in surface PVC conduit|
|New summer house by existing pool. A 32 A distribution circuit from the pool/café block will supply this new structure which will have a four-way SP-N distribution board fitted.||Supplied by a three core 70 0C thermoplastic SWA cable clipped direct|
|1.). 1 As part of the electrical contract, the client is considering an electric vehicle charging unit in the car park supplied from the existing TNC-S supply in the main hotel building. The IET Code of Practice for Electric Vehicle Charging Equipment Installations recommends a TT earthing arrangement for the unit.|
|Draw a fully labelled circuit diagram illustrating the three-phase 400 V supply system and earthing arrangement from the sub-station transformer through to the charging unit. The diagram should show the total earth fault loop path for the charging unit.|
|Your diagram does not need to show the complete detail of distribution boards, metering or consumer control equipment although the diagram should, as a minimum, indicate a connection point for each item of equipment.|
|Refer to IET Code of Practice for Electric Vehicle|
|Reference- Section 722 of BS 7671 for the installation of an electric vehicle charging point Regulation 722.311 requires that a final circuit provided for the connection to electric vehicles must be dedicated to that purpose alone.|
Where automatic disconnection of supply is used as the protective measure, Regulation 722.531.2.101 requires every charging point to be individually protected by an RCD having a rated residual operating current (/Δn) not exceeding 30 mA disconnecting all live conductors, including the neutral (Regulation 722.5126.96.36.199).
The RCD is required to be of a type that can detect and respond to the likelihood of a DC current being present as part of the charging current. If it is known that the DC component of the residual fault current will exceed 6 mA, the RCD must be of type A (Regulation 722.531.2.101).
Where the protective measure is the automatic disconnection of supply and a PME earthing facility is used as the means of earthing TNCS system, special requirements of section 722 apply if an electric vehicle charging point is located outdoors as in this scenario of hotel car park. The special requirements protect against risk of electric shock. An RCD offers no protection in these circumstances as the shock current flows in both the line and neutral conductors passing through the core balance of the device and consequently there is no imbalance to cause operation of the RCD. Options to satisfy the requirements for protection against electric shock could include converting the EV charging point to a TT earthing arrangement or using the protective measure of electrical separation.
|2a) Select, using manufacturers’ data, suitable luminaires for all parts of the pool/café block.|
Your selection should be based on energy efficiency environment/external influences aesthetics escape lighting
Your selection does not need to take into consideration suitable levels of illumination for the purpose of this project or any outdoor lighting.
|Please Quote manufacturers details and References|
|Catalogue Number||IP Rating||Energy Efficiency||Quantity||Cost|
Part No: FLD055 Venture 190W IP67 LED Shore Floodlight 90 Degree Beam Angle Cool White
Dust proof and protected against the effects of immersion up to 1m or 30mins
|4 (Overhead Swimming pool lights)||£270 each|
|LED Underwater light Waterproof IP68 Spot Lights 9W Swimming Pool lamp DC12 – 24V||Ip68 Complete dust and water proof (protected against long period of immersion)||9w||12 (Inside swimming pool)||£63 each|
|IRW0802 Irwin 8 Light Ceiling Light White Code: IRW0802||IP20 Dust Proof||8x40w||6 (Café)||£120 each|
|3.5W LED Emergency Maintained/Non-Maintained Bulkhead||IP65||3.6V Ni-Cd battery||8 (Emergency exit lights)||£9.80 each|
|Scorpius Bathroom Light – 3 Spot Ceiling Light – SPA-27405||IP44 Splash proof (suitable for bathrooms & outdoors where its covered)||Max Wattage – 35W||16 (Hotel room bathrooms inc Summer house||£59 each|
|EDIT HOTEL WALL LIGHT WITH LED READING LIGHT – GREY EDIT HOTEL WALL LIGHT WITH LED READING LIGHT – GREY EDIT HOTEL WALL LIGHT WITH LED READING LIGHT – GREY EDIT HOTEL WALL LIGHT WITH LED READING LIGHT – GREY Code – 9302 2 next to each bed||IP20 IP20: Dust Proof||60w||30 (2 next to each bed)||£59 each|
|FIXED DOWNLIGHT BRUSHED CHROME 240V (32433) + GU10 bulb||IP20||Max watt 50w||128 (4/5 in each bedroom + living room + hallway into rooms + summer house||£3 each|
|Waterproof 3 Watt LED (IP67) Spotlight. Stainless Steel||IP67||Light Output equivalent to a 20-30 watt Halogen||4 above plunge pool||£6 each|
|LEDIFY KUIVI LED LIGHT FOR SAUNA||IP44||3w led. 350lm.||For Sauna||£79|
|Scorpius Bathroom Light – 3 Spot Ceiling Light – SPA-27405||IP44 Splash proof (suitable for bathrooms & outdoors where its covered)||Max Wattage – 35W||4 (Male & Female changing rooms)||£59 each|
- IP20: Dust Proof
- IP21: Drip proof (cannot be in direct contact with water)
- IP23: Drizzle proof (cannot be in direct contact with water))
- IP44: Splash proof (suitable for bathrooms & outdoors where its covered)
- IP54: Splash and Dust proof (suitable for bathrooms & outdoors where its covered)
- IP65: Dust proof and protected against low pressure jets of water
- IP67: Dust proof and protected against the affects of immersion up to 1m or 30mins.
- IP68: Complete dust and water proof (protected against long period of immersion)
- Zone 1 is the bath and shower area of your bathroom. This area needs a higher IP value as there is a lot of moisture and water in which the light needs to be protected from, therefore an IP65 and above is needed with a 12V light source. The lights need to be mounted at least 225cm away from the bottom of the bath or shower.
- Zone 2 is the sink and toilet area of your bathroom or enclosed shower units. This area does not require a high IP value as there is no direct contact with water when in use, therefore an IP44 applies and any lights need to be mounted 60cm from Zone 1.
- Zone 3 is the areas around the bathroom where moisture can occur, this area does not have any form of direct contact with water except where condensation occurs, therefore the minimum IP value required is IP21.
|2b) Show, on either electronic or hard copies of the drawing, positions of the luminaires selected giving each type a suitable form of identification on a separate key.|
|Please Refer to attached drawings and overlays|
|2c) Show, on either electronic or hard copies of the drawing, positions of socket-outlets and fused connection units for the new hotel block giving consideration to the following items of equipment in each room|
|provision for phone charging and/or laptop use|
|supply to a 700 W air handling unit for heating/cooling (Installed by specialist) electric towel rail.|
|Please Refer to attached drawings and overlays|
|2d) Show, on either electronic or hard copies of the drawing, how each circuit in the new hotel extension is to be arranged. The arrangement must take into account that a fault in any one room must not effect another room.|
|Please Refer to attached drawings and overlays. Keys and routes with DB and Circuit to be clearly shown in colour|
|2e) Give each circuit a unique form of identification.|
|Please Refer to attached drawings and overlays Keys and Circuit to be clearly shown in colour|
|2f) Show, on either electronic or hard copies of the drawing, any further distribution boards that may be required in the hotel extension.|
|Please Refer to attached drawings and overlays DB to be clearly shown in colour|
|2g) Show, on either electronic or hard copies of the drawing, how each lighting circuit in the new pool/café block is to be arranged including switching.|
|Please Refer to attached drawings and overlays (Provide Separate Drawings) Keys and routes with DB and Circuit to be clearly shown in colour. Show switching arrangement with BS Symbol for the pool area|
|2h) Give each circuit a unique form of identification.|
|Please Refer to attached Spread sheets and drawings (Provide Separate Drawings)|
|2i) Complete the legend on the drawings using recognised symbols and descriptions for each symbol used on the drawings.|
|Please Refer to attached Spread sheets and drawings (Provide Separate Drawings)|
|3) Select, with the aid of manufacturers’ data, a suitable range of circuit protective devices for this contract. Your selection should be based on the following Prospective short circuit currents|
Requirements for additional protection and special locations
|Start Up Current|
|4.) This question may be answered using the tables in Appendix 1 or Appendix 2. It is strongly recommended that you use pencil 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 reference d) Rating factors that apply e) Minimum cross-sectional area of live conductors for current capacity and voltage drop f) Actual voltage drop. g) Maximum permissible disconnection time for each circuit as given in BS 7671. h) Earth fault loop impedance i) Maximum earth fault loop impedance as stated in BS 7671.
|Please Refer to my attached Spread sheets|
|5) Determine, for one of the circuits supplying the fridges, the minimum possible cross sectional area of cpc which will satisfy the requirements disconnection as ADS under earth fault conditions and the adiabatic equation as Regulation 543.1.3 in BS 7671.|
|6 For this question, use the table below. More copies may be made as necessary.|
|6 a) Determine the maximum demand for the pool/café block electrical installation before the application of diversity.|
|See Table below|
|6 b) Determine the maximum demand for the pool/café block electrical installation following the application of diversity.|
|See Table below|
|No||Circuit Description||Maximum Demand Before The Application Of Diversity In Amps||Diversity factor % Relevant to Circuit||Demand After the Application of diversity|
|7) Explain, with the aid of a diagram, how electric shock protection is provided by one of the shaver points in the hotel extension bathrooms using the Protective Measure: Electrical Separation.|
|8 List, using the box below, five typical extraneous conductive parts and five typical exposed conductive parts that may be found within this entire complex.|
|Typical Extraneous Conductive Parts||Typical Exposed Conductive Parts|
|9 Complete the box below relating to earthing and bonding.|
|Type of protective (earthing/bonding) conductor||Example of where this may be found within this complex||Minimum permissible CSA as BS 7671 (where applicable)|
|Main Protective Bonding||Where PME conditions apply|
Without mechanical protection
|Supplementary equipotential Bonding||For non-PME applications|
With mechanical protection
|Earthing Conductor||For TT installations|
|Earthing Conductor||For TN installations|
|CPC||Without mechanical protection|
|CPC||With mechanical Protection|
|10 Complete the box below relating to isolation and switching.|
|Type of isolation or switching||Example of where this may be found within this complex||Further requirements|
|Isolation for Electrical maintenance purposes||Relating to securing safe isolation|
|Switching for mechanical maintenance||Relating to devices which are not under effective control|
Relating to switching capability
|Functional Switching||Relating to rating where used for discharge lighting|
Supplementary Information for Q6
- Prepare ground for base (3d)
- Base Construction (2d)
- Erect Steel frame and cladding (5d)
- Lay Flooring (2d) after paint and decorate
- Paint and Decorate (2d)
- Prepare ground for parking bays (2d)
- Install Parking Bays (2d)
- Project completed & Handover (0.5d)
- Install Distribution Board (0.5d)
- 1st fix electrical (2d)
- 2nd fix electrical (1d)
- Inspect and Test (0.5d)
- Electrical commissioning (0.25d)
- Electrical completion and handover to builder (0.25d)