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IEEE 1584 · Engineering

Short Circuit Analysis In Mexico

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Can your switchgear clear what CFE can deliver

Fault current is set by the network, not by your load. When the supply is reinforced the duty on your equipment rises, and nothing inside your plant signals that it has happened.

What We Deliver

Fault duties at every bus

Three-phase and earth fault currents are calculated to IEC 60909 at each busbar, with peak, breaking and steady-state components, so each device is compared against the current it would genuinely have to interrupt.

WHY IT MATTERS

The supply changed and nobody told the switchgear

A network reinforcement raises available fault current without any change inside your boundary. Equipment adequate at commissioning can become under-rated silently, and the first indication is a device that fails to clear a fault.

  • Fault level requested from CFE for the actual point of supply rather than inferred from transformer rating, which understates the duty on a strong network.
  • Maximum and minimum source conditions both calculated: maximum governs equipment withstand, minimum governs whether protection picks up at all.
  • Motor contribution above roughly 50 kW included, because large motors feed current into the first cycles of a fault.
  • Devices relying on cascade or back-up protection identified and checked against the manufacturer's tested combination tables rather than curve overlap.
  • Results carried directly into incident energy under IEEE 1584, since an arc flash assessment built on assumed fault current is not defensible.
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DELIVERABLES

What you receive

A signed report against NOM-001-SEDE and IEC 60909, issued by the engineer who carried out the site work.

  1. 1Single line diagram reconciled against the installation as it is actually built
  2. 2Fault current table per bus with three-phase and earth fault duties
  3. 3Device-by-device comparison with an explicit pass or fail against nameplate interrupting capacity
  4. 4Uprating, current-limiting and network-splitting options for every device that fails
  5. 5The calibrated ETAP model, so the next supply change is a re-run rather than a new study
Reach Out

How the study runs

01

Walk-down and scope

A lead engineer verifies the single line diagram against the installation and records nameplate data from transformers, switchgear and large motors.

02

Source and asset data

CFE fault level is requested for maximum and minimum conditions, alongside transformer test certificates, cable schedules and protection settings.

03

Model build

The network is rebuilt in ETAP from verified data, and where records disagree with the installation the installation governs and the discrepancy is recorded.

04

Fault calculation

Symmetrical and asymmetrical fault currents are calculated at every bus across the switching configurations the plant actually operates in.

05

Adequacy comparison

Calculated duties are compared against installed ratings, and every shortfall is quantified rather than simply listed as a warning.

06

Report and handover

Findings are ranked by consequence, mitigation is costed, and the model is handed over with a walkthrough for your maintenance team.

Frequently asked questions

The fault level at your point of supply, as both a maximum and a minimum figure. Maximum determines whether your switchgear can interrupt the worst case; minimum determines whether protection operates at all. A single value is not enough, and obtaining it can take time, so it is worth requesting at the enquiry stage.
NOM-029 requires electrical risk to be analysed before maintenance work and controls to be established. That analysis depends on knowing fault current and clearing time, which is what this study establishes. Without it, the risk analysis rests on assumed values and the resulting procedures inherit that uncertainty.
Whenever the source or the network changes: a CFE reinforcement, a transformer upgrade, added generation, or any switchgear extension. Utility networks are strengthened over time, so a study more than a few years old may describe a fault level your site no longer has, and that error runs in the unsafe direction.
Not for the analysis, which is carried out offline from data captured on site. An outage is needed only where protection settings must be verified at the device or panels opened to confirm nameplate data that records do not cover. Any such requirement is agreed before mobilising rather than raised during the visit.

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