Note: As shown in the example above, I suggest scaling each feeder and recording the distance on the one line diagram as shown in the example above. As with all estimating, we will break the whole into smaller sections. 39 We now perform a takeoff of the feeders. Riser to MDP Note: The heights of the risers are 20’. 01. 6-3” Unistrut straps 02. 10’ Unistrut 03. 2-3” Myers Hubs (To enter MDP) 04. 2-3” weather heads 05. 40’- 3” GRS. ( Specifications call for GRS outside) Next is installing the conductors. Most estimators will decide how much conductor that they will add for termination and use that length. There will be exceptions to the rule and you may need to adjust that length at times. In this example, we are going to use the choice of 10’ for the riser and 15’ from MDP to the panels. Having pre-determined lengths in your mind will help you not to get bogged down when estimating. You must use a measure that you are comfortable with and not second-guess yourself. 06. 240’-350 THHN 07. 4-rolls of tape-Black-Orange-Blue-white For a mental vision, this is what is left. 40 MDP to panel A When I first started, I used to draw the feeder that I was working on so I could visualize the parts needed like the following example. 08. 25’ of #8 THHN 09. 75’-#3THHN 10. 2-1/1/4” Plastic Bushings as shown above 41 11. 2-1-1/4” set Screw Connectors 12. 10’-EMT 13. 2-1-1/4” EMT Straps This is what is left. MDP to Panel B 42 14. The distance horizontal was 60’( 60’ of 2” PVC Sch. 40) 15. 2-2” female adaptors 16. 2-2” GRS 90’s 17. 2-2” GRS couplings 18. 4-2” EMT Connectors 19. 2-2” Plastic Bushings 20. 10’-2”EMT. 5’ at each end. Now for the conductors 21. 60’(Horizontal) + 5 x 2’ ( Rise) + 3’x 2 (for the 90)+15’ for terminating=91’ 22. 91’ of #6 23. 273-3/0 THHN Panel B to lighting Contractor and Time Clock 24. 2-1” x 3” nipples 25. 8-1” Lock nuts 26. 4-1’ Plastic Bushings 27. 30’ #10 THHN (the lighting circuits call for number 10 THHN, so we will just include the TC also) 43 MDP to K Below is the new picture. We have 110’ horizontal as shown in the drawing above. 110’ 44 28. The distance horizontal is 110’( 110’ of 2-1/2” PVC Sch. 40) 29. 2-2-1/2” female adapters 30. 2-2-1/2” GRS 90’s 31. 2-2-1/2” GRS couplings 32. 4-2-1/2” EMT Connectors 33. 2-2-1/2” Plastic Bushings 34. 10’-2-1/2”EMT (5’ rise at each end) Now for the conductors. 35. 110’ (Horizontal)+5’ x 2’ (Rise) + 3’ x 2( for the 90)+15’ for terminating=141’ 36. 141’ of #6 37. 564-3/0 THHN 45 Grounding 38. Grounding electrode conductor to the building steel is 50’ as shown. 50’ of 2/0 bare copper. 39. Connection to building steel (your choice of connection) 40. 30’ of #6 to telephone as shown 41. Connection to full size ground 42. 20’ of 2/0 bare for water line as shown. 43. 2/0 water pipe grounding clamp 44. 34’ of #4 to connect to footing. 45. Connection to full size ground 46. 2-split bolts to connect to steel in footing. 47. 15’ of #6 to ground rod. 48. Connection to full size ground 49. Ground rod 50. Ground rod clamp One line Breakdown No matter how you accomplish this task, this is what must take place. You should compile a complete material list of the products that you just took off, minus the notes. 46 You will need to price each piece of material. This can be accomplished by sending out to a supply house, using pricing sheets, or a variety of methods. Next, you will record a man-hour for each product listed. You will extend both list for a total material cost and total man-hours. It will look like the example below: 47 Although your method may look completely different, this is the procedure that you must go through to estimate the one line diagram. Note: We have not included the labor to install the gear itself. You may also include special notes on your line items. When you advance, you will use an electrical estimating software such as the Best Bid. To take off the feeder to Panel A, you 48