Power System Studies
Coordination Studies
Time-current curve analysis that isolates faults to the smallest section possible, protecting equipment, uptime, and life safety.
Overview
Selective coordination ensures that when a fault occurs, only the device immediately upstream of the fault trips. The rest of the facility stays online. We plot time-current curves for every protective device in the distribution network, identify coordination gaps, and recommend setting changes to restore selectivity, including the 0.1-second selectivity requirement for emergency, legally required standby, and critical operations systems under NEC 700, 701, and 708.
What's included
Scope of work
TCC plotting for every protective device on the studied feeders
Selective coordination evaluation between upstream and downstream devices
NEC 700.32 / 701.27 / 708.54 evaluation for emergency, LRS, and COPS systems
Setting recommendations for adjustable trip breakers and relays
Damage curve overlay for transformers, cables, and motors
PE-stamped report with TCC plots and setting tables
Methodology
How the engagement runs
A consistent process means predictable timelines, fewer surprises, and a defensible record if anyone (AHJ, insurance, OSHA) asks how the work was done.
- 01
Existing-condition data
Protective device makes, models, and as-found settings captured from the field along with conductor and transformer data.
- 02
TCC plotting
Curves plotted in ETAP or EasyPower with damage curves overlaid.
- 03
Gap analysis
Each upstream/downstream pair evaluated for selectivity; any overlaps within the fault current range are flagged.
- 04
Setting optimization
Adjustable settings are tuned to restore selectivity while preserving equipment damage protection.
- 05
Report
Final TCC plots, recommended settings table, and PE-stamped summary delivered.
Stamped
100%
Every deliverable PE-stamped by a licensed engineer in the project state. Across all 24 registered states.
Response
1 day
We respond to every inquiry within one business day with a scoped proposal and a real timeline.
Veteran-owned
VOSB / SDVOSB
SAM.gov registered. UEI H6HAZKAD4LJ7 · CAGE 08E02. Set-aside eligible.
When you need it
Triggers
- →New construction or service upgrade
- →Healthcare facility EPSS commissioning
- →Trip events that took out more of the facility than expected
- →Authority having jurisdiction (AHJ) request
What you receive
Deliverables
- PE-stamped coordination study (PDF)
- Time-current curve plots
- Settings table for every adjustable device
- List of devices needing replacement to achieve coordination
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Ready to scope your coordination studies engagement?
Send us the basics (facility type, equipment, timeline) and we’ll respond with a scoped proposal within one business day.