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Carelabs

IEEE 1584 · Engineering

Short Circuit Analysis For Safer Networks

Safeguard your facility from short circuits with smart solutions. We analyze, detect, and recommend the best proactive safety measures. Carelabs calculates fault current at every bus using the ANSI/IEEE C37.010 and IEC 60909 methods and confirms your fuses and breakers are sized to clear a fault safely.

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What the study establishes

Fault current decides whether your switchgear can interrupt what it may one day be asked to interrupt. Everything below follows from getting that number right.

What We Deliver

Fault current at every bus

Three-phase, line-to-line and line-to-earth fault duties calculated at each busbar to IEC 60909, including peak, breaking and steady-state components. Every protective device is then checked against the current it would actually have to clear rather than the current assumed at design stage.

WHY IT MATTERS

An under-rated breaker does not trip. It fails.

A device asked to interrupt more fault current than it is rated for does not operate late. It can fail to clear at all, and the fault burns until something upstream removes it. Nothing about a healthy installation reveals that in advance.

  • Fault duties calculated for both maximum and minimum source conditions. Maximum governs equipment withstand; minimum governs protection pick-up, and the minimum case is the one most often left out.
  • Utility fault level obtained from TNB for the actual point of connection rather than inferred from transformer rating, which understates the duty on strong supplies.
  • Motor contribution above roughly 50 kW included. Large motors feed current into the first cycles of a fault and are routinely omitted from quick calculations.
  • Results feed directly into arc flash incident energy under IEEE 1584 — short circuit is the prerequisite study, not an optional companion to it.
  • Findings ranked by consequence, so one under-rated incomer is not buried among a list of minor observations.
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DELIVERABLES

What you receive

Every engagement closes with a report package aligned to MS IEC 60364 and issued by the lead engineer who carried out the site work.

  1. 1Single line diagram reconciled against the installation as it is actually built, not as it was originally designed
  2. 2Fault current table per bus covering three-phase and earth fault duties, with peak and breaking values
  3. 3Device-by-device duty comparison with an explicit pass or fail against nameplate interrupting capacity
  4. 4Uprating, current-limiting or network-splitting options for every device that fails, with the trade-offs stated
  5. 5The calibrated ETAP model file, so the study can be re-run when the network changes
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How the study runs

01

Scope and site walk-down

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

02

Utility and asset data

Fault level at the point of connection is requested from TNB for both maximum and minimum conditions. Transformer test certificates, cable schedules and protection settings are collected.

03

Network modelling

The network is rebuilt in ETAP from verified data. Where records and reality disagree, the installation governs and the discrepancy is recorded for your drawing set.

04

Fault calculation

Symmetrical and asymmetrical fault currents are calculated at every bus to IEC 60909, across the full range of source and switching configurations the site actually operates in.

05

Duty comparison

Calculated duties are compared against installed equipment ratings. Devices relying on cascade or back-up protection are identified and checked against the manufacturer's tables.

06

Report and handover

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

Frequently asked questions

Incident energy under IEEE 1584 is calculated from fault current and clearing time. Both come out of the short circuit study. Running an arc flash assessment on assumed fault levels produces labels that look authoritative and may understate the hazard, so the sequence matters more than the schedule pressure that tempts people to skip it.
The fault level at your point of connection, stated as both a maximum and a minimum value. Maximum determines whether your switchgear can interrupt the worst case; minimum determines whether protection will pick up at all. A single figure is not enough, and we request the letter directly where you prefer.
Whenever the source changes or the network is extended. In practice that means after a TNB reinforcement notice, a transformer upgrade, the addition of embedded generation, or any switchgear extension. Utility networks are reinforced over time, so a study more than a few years old may be describing a fault level your site no longer has.
The analysis itself is carried out offline from data captured on site, so no outage is needed for the modelling. An outage is only required if protection settings have to be verified at the relay or if panels must be opened to confirm nameplate data that records do not cover.

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