A Survey Of European And American StandardsConcerning Electrical Systems In PotentiallyExplosive Atmospheres
Bibliographic record
Abstract
The technical and legal standards presently enforced in Europe and North America in connection with electrical systems in potentially explosive atmospheres are analyzed and compared in this paper to supply useful information about the classification of potentially explosive environments and the consequent design and update of electrical systems. Before European Directives 94/9/CE and 99/92/CE were enacted, safety in these environments was assured only on a national level, which involved different safety regulations for each State of the European Union and hindered free movement of products in the single local market. For this reason, the European Parliament established safety directives valid all over the European Union that State was required to enforce passing specific local laws, standards and guidelines in substitution of the previous ones. Actually, the new European directives and consequently the new local rules leave the designer a wide range of choices and possibilities, including appropriate, individual approaches; for this reason the knowledge of American standards can help to develop the best solutions complying with the prescribed requirements within affordable costs. In this context, this paper aims at supply useful practical procedures and suggestions to correctly apply the present prescriptions by highlighting the differences between European old and new approaches and the standards presently enforced in North America (the U.S.A. and Canada).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.008 | 0.013 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.005 | 0.010 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
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".