IEEE 1349-2021 - Electric Machines in Hazardous Locations - Worldwide Applications
Bibliographic record
Abstract
IEEE Std 1349-2021™ [1] “Guide for the Application of Electric Machines in Zone 2 and Class I, Division 2 Hazardous (Classified) Locations,” the third edition, has been updated for the 2020 National Electrical Code, NEC [2] and guidance has been added for the 2021 Canadian Electrical Code, CE Code [3]. The Guide has been expanded to harmonize internationally and updated for IEEE Std 841 [4] for TEFC motors and IEEE P303 [5] for auxiliary devices. Some elements from the IEC - International Electrotechnical Commission - Increased Safety standard was included. Precautions against excessive surface temperatures and sparking are covered. To mitigate hot surface temperatures and sparking, this document provides guidance for selecting, operating, and maintaining motors where flammable gases and vapors may occasionally be present.This paper provides an overview with highlights of key elements, discusses worldwide applications, includes new space heater tests and applications, and describes a new test method to determine the permanent magnet (PM) motor rotor temperature. It also details machine temperature test information along with adjustable speed drive (ASD) test configurations and provides an overview of discharge energy calculations due to common-mode voltage (CMV) for ASD applications with a link to the new IEEE 1349 Discharge Energy Calculator [6].
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.007 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".