Electrical · Medical office fit-out
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A real electrical takeoff. Every number shown.
Most estimating services gate their samples behind a phone number. This is
the whole thing: the quantities, the arithmetic that produced them, every assumption we had
to make where the drawings were silent, and the questions we sent back. Check the maths.
That is the point of publishing it.
Electrical takeoff, medical office fit-out
Quantities only. No prices invented, you apply your own.
Project 4,800 SF single storey fit-out
Rooms 12
Documents E-1, E-2, E-3, A-1
Revision Permit set
01 Device counts
| Item | Basis | Qty |
|---|
| Duplex receptacles | counted per room off E-2, general purpose | 68 |
| GFCI receptacles | lab, break room, both restrooms, per NEC 210.8(B) | 7 |
| Single pole switches | one per controlled zone off the lighting plan | 16 |
| Dimmers | exam rooms and offices where the schedule calls for 0-10V | 11 |
| Recessed cans | counted from the fixture schedule, type C1 | 37 |
139 devices total. Counted device by device off the E-sheets, cross-referenced against A-1 for room names. Not scaled, not estimated from area.
02 Branch circuits
| Item | Calculation | Result |
|---|
| General lighting load | 4,800 SF x 3.5 VA/SF | 16,800 VA |
| Lighting circuits | 16,800 VA / 277 V = 60.6 A, at 80% of 20 A | 4 circuits |
| Receptacle load | 75 outlets x 180 VA per NEC 220.14(I) | 13,500 VA |
| Receptacle circuits | 13,500 VA / 120 V = 112.5 A, at 80% of 20 A | 8 circuits |
| Total branch circuits | 4 lighting + 8 receptacle | 12 circuits |
The 3.5 VA/SF figure is NEC 2017 Table 220.12 for office occupancy. NEC 2020 revised those unit loads. Which edition your AHJ enforces changes the lighting branch count, so it is raised as RFI 1 rather than assumed silently.
03 Raceway and conductor
| Item | Calculation | Order |
|---|
| Home run raceway | 12 circuits x 85 ft average run | 1,020 LF |
| #12 THHN conductor | 1,020 LF x 3 conductors, plus 10% waste | 3,366 LF |
| Device boxes | one per device, 4 inch square | 139 |
| Plaster rings | one per device box | 139 |
| Panel | 12 circuits used of 42, 208/120V three phase, 225 A MLO | 1 |
Average run length is measured off the plan, not assumed. Spare panel capacity is 30 circuits, 71 percent, which is worth knowing before you bid a job the owner may expand.
04 Assumptions we had to make
| Where the drawings were silent | What we carried |
|---|
| Ceiling type not noted on E-2 | Accessible lay-in, no fishing allowance carried |
| Conductor type not specified | #12 THHN copper |
| Wiring method not called out | EMT throughout, no MC assumed |
| Mounting heights not dimensioned | 18 in AFF receptacles, 44 in AFF switches |
| Fixture voltage not stated on the schedule | 277 V lighting, 120 V receptacles |
Every one of these is a number that moves if you tell us otherwise.
That is why they are listed instead of buried. An estimate without its assumptions
written down is not an estimate, it is a guess with a decimal point.
05 RFIs issued back to the contractor
- Which NEC edition is the AHJ enforcing?The general lighting unit load for office occupancy differs between the 2017 and 2020 editions of Table 220.12. It changes the lighting branch circuit count and therefore the panel schedule. This is the single largest open variable in this takeoff.
- EMT or MC cable?The drawings do not call out a wiring method. The labour difference between EMT and MC on 1,020 LF of home run is larger than the material difference, so we have not chosen for you.
- Is the lab receptacle count final?Eight receptacles are shown in the lab with no equipment schedule issued. Lab equipment frequently drives dedicated circuits that are not on the general power plan.
- Emergency and egress lighting?No emergency fixtures, no exit signs and no inverter appear on E-2. For a medical occupancy that is unusual. Confirm they are on a separate sheet before you bid this as complete.
- Fire alarm scope?Excluded here. If it is in your scope it is a separate takeoff, and it changes the raceway count.
The RFIs are the part that protects you at bid time. A takeoff
that raises none has not read the drawings, it has measured them.
06 Excluded from this takeoff
- Fire alarm and low voltage
- Data and communications cabling
- Temporary power
- Equipment furnished by others
- Trenching and site work
- Gear beyond the panel
- Permits and inspection fees
- Testing and commissioning
- Sales tax and freight
- Overtime and off-hours work
Exclusions are published in plain sight so nothing is assumed covered
that is not. The dangerous line item is always the one nobody wrote down.