ESTIMATION GUIDE
- Prepare paper, pencils, scale and rulers. Mark papers indicating the panel no., circuit number and the location of the circuit run.
- Study plans, drawing and specifications.
2.1 Coordinate with Civil, Mechanical and Architectural Estimators about the following
2.1.1 Height between floors
2.1.2 Drop ceilings and ceiling supports
2.1.3 Height between finish floor and ceilings
2.1.4 Major beams and columns thru which conduits may not pass
2.1.5 Other architectural/civil/mechanical drawings indicating positions of the lights, special outlets or aircon unit equipment.
2.2 Check and make a physical count of the following
2.2.1 Lighting fixtures – number of each type of fixtures
2.2.2 Convenience outlets – duplex
2.2.3 Special outlet
2.2.4 Panel boards – make a complete description of each panel board.
The description should include:
a. main breaker rating or lugs only
b. no. of branches per ampere trip
c. kAIC
2.2.5 Other electrical equipment to be supplied by contractor
2.3 Study carefully the circuit runs and the riser diagram together with the schedule of load.
- Determine the approximate length of wire and conduit per circuit.
3.1 For the conduit (each circuit) - measure the length from the last outlet to the panel using the scale. The trace of the route must be followed as per drawing.
3.2 For the wire – measure the length between outlets and the length shall be multiplied by the no. of wires. The sum of the products (lengths x the no of wires) shall be the approximate length of wire.
3.3 Sum up the total length of conduit per size and divide by 3. Round off and add 10%.
3.4 Sum up the total length of wire for each size and divide by 150 to get the no of rolls. Round off and add 10%.
3.5 Set aside the papers and data temporarily.
- Determine the approximate length of wire and conduct for the panel homerun to the main panel or main distribution panel.
4.1 Conduits – measure the length of the run. Check the shortest possible route and avoid obstructions. Total length divide 3 and add 5%
4.2 Wire – multiply the length of conduct by the following constants
a. 2- for two-wire single phase
b. 3- for two-wire single phase with neutral
c. 3- for three-wire, 3-phase
d. 4- for 3-phase, 4 wire
- Boxes
5.1 Octagonal boxes – provide one box for each lighting fixtures
5.2 Utility box 4”x 2” – provide one box for each switch, duplex outlet or special outlet (small)
5.3 Square box 4” – provide one box if the conduits terminating exceed 4 conduits or special big outlets.
5.4 Square
5.5 Pull boxes – provide one box for every 18 meters of conduits length depending upon the length of run. Other pull boxes may be designated by plans. Check with the designer/consultant about the sizes.
6. Fittings
6.1 For PVC pipes
6.1.1 Couplings – provide 1 coupling for every length plus 1 coupling for every termination.
6.1.2 Elbows – provide 1-900 elbow for every quarter turn for sizes of 32 mm (1 1/4”) and above.
6.1.3 Cement – provide 1 can for every 10 length of conduit.
6.1.4 End bells – provide 1 for every termination.
6.2 For RSC conduits
6.2.1 Coupling – provide 1 additional coupling for every 5 lengths
6.2.2 Elbows- provide one 90-degree elbow every 90-degree turn for sizes of 25 mm (1”) diameter above.
6.2.3 Locknut and bushing – provide one pair for every termination.
6.3 For electrical metallic tubing
6.3.1 Couplings- one set for every length
6.3.2 Elbows- use on site bended EMT
6.3.3 Adapters w/ locknut and bushing- for every termination are 1 adapter and 1 pair of locknut and bushings.
6.4 Straps – two (2) straps for every length of conduit. In sizes of 25 mm diameter and above use clamps especially for RSC or EMT conduits.
6.5 Other fittings
6.5.1 Wire trays/cable trays – check with drawings and consultant/designer
6.5.2 Cable trough / duets – check w/ drawings especially that the drawings may have specific sizes.
7. Other Considerations
7.1 for lighting fixtures – add 1 m of wire for every termination or lighting fixtures
7.2 for convenience outlets
a. Add 0.8 m. for every C.0. to the length of pipe and 1m of wire for every termination
b. Add 0.4 m above the height of counters if the C.O. is above the counter in addition to the height of the counter. Add also 1 m of wire for every termination.
7.3 for homeruns terminating a panel boards add 2 meters of wires for every circuit.
7.4 provide an empty conduit for every spare circuit per panel
7.5 normally the electronic and communication circuits will be in separate sheets and have an ECE estimate
7.6 provide 1 connector for every termination # 6 up.
8. Summarize the lists of materials as follows
8.1 conduits – total of each size
8.2 fittings - total of each type/size
8.3 boxes - total of each type/size
8.4 panels – per panel and lowest canvassed price
8.5 Wires - total length of each wire size
8.6 Connectors – (solderless less) total termination of each size for wire #6 wire and above.
8.7 Tape – 1 roll PVC tape for every 100 m of wire plus 1 roll of rubber tape for every 200m of wire.
8.8 other materials must be itemized.
9. Costing
9.1 get the unit cost for each item and deduct all discounts.
9.2 from the total cost add 5% to 10% mark up
9.3 For all others materials like duets, panels, transfer switches, safety switches, and etc.- get the price from the fabricator net (less discounts) and add 5% markup.
10. Preparation of Bid or Asking Price
10.1 Material cost
Conduits Fitting Boxes__________________________
Wires and wiring Devices________________________
Lighting fixtures _______________________________
Safety Devices_________________________________
Service Entrance and Mains_______________________
Others________________________________________
_______________________
Subtotal A
10.2 Labor Cost
10.1 If materials are imported
a. Labor Cost is 20 % of subtotal A
b. Supervision is 3% of subtotal A
c. Mark-up is 1.25 % of subtotal A
10.2 If the conduits and most materials are locally available
a. Labor cost is 25 % to 30% of subtotal A
b. Supervision cost is 4% to 5% of subtotal A
c. Mark up cost is 2 % of subtotal A
10.3 Contingencies – an allowance of 5% to 7% of the total cost of materials and labor
10.4 Overhead – this include the cost of transportation, office staff tools and equipment depreciation, papers and office supplies to representation, and cost of money.
- Normally 7% to 10% of the cost of materials is the cost of overhead.
10.5 Permits – show the plans to the municipal electrical engineer or his assistant and request for an estimate. Add 5% to cover the exingencies.
10.6 a. the sum cost as computed in 10.1 and 10.5 is to be multiplied by 0.03 to get the contractor’s tax.
b. Add the contractor’s tax to the sum of sections 10.1 to 10.5 and round off. This will be your bid price.
Please could u post
ReplyDelete1. load scheduling
2. genset sizing
3. cable sizing
4. shortcircuit calculations
5. voltage drop calculations
6. relay, circuit breaker and fuse selection and calculations
7. Transformer selections and sizing
8. Earthing and Grounding
9. capacitor bank calculations
10. and general calculations like that ..
please do this help for electrical designers
thank you in advance ..
Thanks a lot! Very helpful post you got here. We're planning to build a house in a residential lot and this gave me an idea on what to prepare and estimate the total cost. We're checking on the architect on how he's gonna layout the cable tray system. Wish to read more from you. Keep on posting!
ReplyDeleteThis comment has been removed by the author.
ReplyDeletePlease share how much is the costing per outlet for renovation. Thank you in advance.
ReplyDeleteNice blog… Thanks for sharing very useful information about electrical circuits.
ReplyDeleteDesigning Electrical Circuits
It would mean that the electricity flowing into the fitting would be taken down the Earth Wire into the ground whilst blowing the fuse. Serious Electricians Sydney
ReplyDeleteHow much is the.price.range?
ReplyDeleteMost likely this is a fantastic post I got a great deal of learning subsequent to perusing good fortunes. Topic of web journal is incredible there is very nearly everything to peruse, Brilliant post. camping generators
ReplyDeletemuch obliged for the tips and information..i truly value it.. camping generators
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteIn addition, should you bundle your house phone service with your Internet program, you will require a modem which has a telephone port. You can find more details on Linksys CM3024 Review - For High-Speed Internet and Wi-Fi - The Great Device on the site thegreatdevice.com.
ReplyDeleteThe A2 still utilizes some acrylic pieces but they're mostly in areas that do not demand stiffness. Learn about 3D printer on site.
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteThe best projectors under $200 needs to be flexible enough and enable you to connect many diverse devices on sparrow surf.
ReplyDeleteAlong with the ESPA, you might also be asked to finish a commercial Electric Permitting Application for multi-metered industrial projects. If you are curious to know more about electronic manufacturing, check here.
ReplyDeleteSince there are many types of HVAC Companies out there, choosing the best will be an important decision that you will need to make in order to ensure that you get the right deal. You are curious to know more about hvac parts store, discover here.
ReplyDeleteIf you're looking for the best MacBook stand for your laptop then look no further. This is going to be a simple and quick guide to help you make an informed decision. For more ideal details about best macbook, click here now.
ReplyDeleteThe use of electricity has a number of advantages and so people have started to use different kinds of devices. The problem with the technology though is that with the passage of time, there is an increase in the use of electricity. Click here to get more information about alternative replacement.
ReplyDeletethe loan company that grants me loan of 5,000,000.00 USD When other loan investors has neglect my offer but mr benjamin lee granted me success loan.they are into directly in loan financing and project in terms of investment. they provide financing solutions to companies and individuals seeking access to capital markets funds, they can helped you fund your project or expand your business.. Email Contact:::: Also 247officedept@gmail.com or Write on whatsapp Number on +1-(989-394-3740)
ReplyDeletehow to compute the guarantee, performance and surety bonds.
ReplyDeleteI am very grateful to Dr Dawn Acuna, for bringing back my husband who left me for another woman, that moment my husband Left me I thought I lost everything until a friend of my gave me Dr Dawn Acuna, WhatsApp contact, I messaged her and told her the pain I was going through so she told me that everything was going to be fine that if I have the faith and believe in her that the spell will surely work for me and my husband will surely come back home and she told me what to do, so those things were done and 48 hrs later my husband came back home begging for my forgiveness, am so happy and grateful to Dr Dawn Acuna, if you need her help contact her, she's accurate and sincere,
ReplyDelete* If you want spell to conceive.
*If you want to get pregnant.
* If you want to return your lover
*If you want to cure any kind of sickness
* If you need spell to get good job. *If you want to stop having miscarriage. And E.T.C. write her on email { dawnacuna314@gmail.com }
WhatsApp: +2348032246310
How to make money from sports betting in 2021 - WorkNow
ReplyDeleteLearn how to หารายได้เสริม make money from sports betting in 2021 in this guide. We break down the basics of sports gambling in one place.
Your post looks interesting..! Thanks for Sharing Your Article is more helpful and more informative.
ReplyDeleteNice blog share, Thanks for Sharing and more helpful and more informative. visit website Residential MEP Estimating Services
ReplyDeleteYour post looks interesting..! Thanks for Sharing Your Article is more helpful and more informative.
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteI have read a fantastic blog post. It will help a lot of people. Thank you so much for these unique posts, and please keep updated on this excellent article. Thank you for sharing such a great blog with us.
ReplyDeleteCable Size Calculator Australia!
Reading your blog was a journey through a landscape of profound ideas. Your ability to weave facts with narrative is exceptional. It's not just a read; it's an experience to savor.
ReplyDeleteelectronic components shop near me
electronic parts
electrical components
electronics component suppliers
electronic component suppliers
I liked your blog. Shared very helpful content. Thanks to share with us.
ReplyDeletemax demand calculator
Nice content you shared. It’s really helpful blog. Thanks for sharing.
ReplyDeletePowerPac Software
Amazing blog you shared. Thanks for sharing. I really liked it.
ReplyDeletecable size calculator australia
When estimating costs, start with paper, pencils, scale, and rulers. Mark your papers with panel numbers, circuit numbers, and circuit run locations. Carefully study the plans, drawings, and specifications. For those needing materials, consider sourcing wholesale electrical wire to ensure you have quality supplies at a good price.
ReplyDeleteNeon Cables is a leading Panel Wire Suppliers. Polycab Panel Wire, Solar Panel Wires suppliers, exporters offer best Panel Wire Cables in Gujarat, India.
ReplyDelete