Project types EEP handles every day
Tenant fit-outs
Lease-area-only load, common-area exclusion, panel rework on existing service. Both standards.
Office towers
Floor-by-floor connected load, riser feeders, distribution boards per stack, code-compliant SPD per NEC 230.67 / CEC 26-700.
Retail & mixed-use
Anchor tenants plus inline stores, separate house panel, signage and emergency lighting overlays.
Strip plazas & pad sites
Small commercial with show-window receptacle calc, exterior parking-lot lighting, EV-ready conduits.
How the calculation actually works
EEP keeps the two standards strictly separate. Pick the standard at project creation and every calculation, label, and code citation flows from the corresponding rule pack.
NEC 2023 — Article 220 Part III
- General lighting from Table
220.12by occupancy (office3.5 VA/ft², retail3.0 VA/ft², warehouse0.25 VA/ft², restaurant2.0 VA/ft², etc.). - Receptacle load per Article
220.14(I): 180 VA per general-purpose receptacle, then demand factors from220.44for non-dwelling. - Demand factor per
220.42: first 12,500 VA at 100%, remainder at 50% (warehouse follows220.42(C)separately). - Fixed appliances
220.53, motor loads430.24, HVAC220.60. - Continuous loads sized at 125% per
215.2(A)(1)for feeders,210.20(A)for branches. - Service SPD mandatory at all new services per
230.67(NEC 2023 addition).
CEC 2024 — Rule 8-210 + Table 14
- Connected load = sum of luminaires, receptacles, and equipment in VA.
- Load density in W/m² selects the Table 14 demand factor: ≤12 W/m² → 100%, 12–25 W/m² → 75%, 25–50 W/m² → 65%, >50 W/m² → 50%.
- Demand load = Connected × DemandFactor (Rule
8-210(2)). - Service size from Rule
14-104— selects nearest standard OCP at or above the design current. - Voltage drop mandatory per Rule
8-102: ≤3% recommended (combined feeder + branch typically ≤5%).
What EEP does for you, automatically
- Demand factor selection — no manual table lookup; the engine picks the row from your inputs.
- Continuous-load 125% applied automatically to lighting, exterior, sign, and any load you flag.
- OCP rounding to the standard breaker/fuse size per
240.6(A)(NEC) or Rule14-104(CEC). - Conductor sizing at the correct terminal-temperature column — NEC
110.14(C)60°C/75°C switchover at 100 A, CEC 75°C default. - Voltage-drop check with corrected resistance for stranded copper or aluminum at the actual conductor temperature.
- Panel schedule with auto-balance across phases, spare-circuit recommendation, and exportable RPT-002.
- Single line diagram sized and labelled from the same state — no second source of truth.
Outputs you can hand to plan review
- RPT-001 Service Load Calculation — every line cites the rule (e.g.
NEC2023-T220.12,CEC2024-R8-210). - RPT-002 Panel Schedule with phase balance, load per pole, neutral and EGC sizing.
- RPT-003 Feeder Schedule with conductor, OCP, conduit fill, voltage drop, and run length.
- SLD PDF with one-line for service, distribution, and feeders.
- TraceStep™ audit log — formula, inputs, substitution, intermediate values, final result.
Tenant Fit-Out mode. Toggle
project_type = TENANT_FIT and the form collapses to tenant-scope inputs. Common-area loads (building HVAC, corridor lighting, parking) are excluded from your demand — they remain on the landlord service.
Edge cases EEP handles correctly
- Show windows per NEC
220.43(A)— 200 VA per linear foot of show window, added to the lighting demand. - Sign branches per NEC
600.5(A)— minimum 1,200 VA outlet, sized at 125% for continuous duty. - Parking lot & site lighting on a separate house feeder with photocell/timer control.
- EV-ready conduits per local amendments (e.g. Toronto Green Standard, CALGreen) — stub-up sized for future Level-2 charging.
- Receptacles for commercial kitchens per NEC
220.56demand factors for ranges, ovens, and counter-top equipment.