What Are The Driving Forces In The Selection Of A Hazardous Location Electric Motor - Divisions Vs Zones?
Bibliographic record
Abstract
The National Electrical Code (NEC) [1] and Canadian Electrical (CE Code) [2] both discuss the installation requirements for an electric motor to be installed in “Division” or “Zone” hazardous locations. Also, both the NEC [1] and the CE Code [2] discuss the interchangeability provisions for “Division” and “Zone” area classifications, meaning that one can install a “Division” area suitable motor in a “Zone” area or vice-versa. Even though the interchangeability is permitted, the motor design, materials, and accessories may differ due to testing and marking requirements of the country-specific adaptations of UL, CSA, or I EC standards. These requirements impact the cost and delivery of the motor. Stock, or off-the-shelf products, may not be able to be utilized. This paper covers the design, construction, and testing differences between a motor that is “identified for use” in a Division 2 or a Zone 2 location, versus one that is not. Motor accessory devices and the end users’ perspectives are also included.
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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 | 0.028 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.002 | 0.005 |
| Scholarly communication | 0.007 | 0.005 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.014 | 0.003 |
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".