Back Compressive Force Limit NIOSH 3400 N Checker
Compare independently computed back compression to named3400Nreference; not RNLE load limit or approved individual spinal tolerance. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
A modeled back-compression force can be compared with a stated reference value.
A modeled back-compression force can be compared with a stated reference value.1
The comparison does not estimate the force from posture or prove that a task is safe. Use this tool to calculate back Compressive Force Limit NIOSH 3400 N Checker from the supplied measurements and assumptions.
When to use Back Compressive Force Limit NIOSH 3400 N Checker
Use this tool to calculate back Compressive Force Limit NIOSH 3400 N Checker from the supplied measurements and assumptions. Establish the observation protocol, units, task and reference population or review criterion before entering measurements.
How to use Back Compressive Force Limit NIOSH 3400 N Checker and understand its results
- Establish the observation protocol, units, task and reference population or review criterion before entering measurements.
- Enter independentlyModeledBackCompressionN, using the field meanings and rules below, then run the tool.
- Read signedNamedCompressionReservesN, aboveNamed3400Indices. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| independentlyModeledBackCompressionN | Independently modeled back compression n; caller assertion or measurement requiring independent evidence | list of number | Required |
Enter nonempty nonnegative independently modeled compression forces in N. Return 3400−force and indices with force strictly above 3400. Equality gives zero reserve without a flagged index; no force-estimation or task-safety model is applied.
reserveN_i=3400−modeledForceN_i; aboveReference={i:force_i>3400} Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| signedNamedCompressionReservesN | Signed Named Compression Reserves N; follow the units, sign, ordering and evidence convention stated above | list of number |
| aboveNamed3400Indices | Above Named3400 Indices; follow the units, sign, ordering and evidence convention stated above | list of number |
{
"input": {
"independentlyModeledBackCompressionN": [
3000,
4000
]
},
"output": {
"signedNamedCompressionReservesN": [
400,
-600
],
"aboveNamed3400Indices": [
1
]
}
}Limitations and assumptions
The comparison does not estimate the force from posture or prove that a task is safe. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use NIOSH RWL Load Constant Base Calculator for this related task: The Revised NIOSH Lifting Equation multiplies a load constant by six task multipliers.
Use NIOSH Lifting Index LI Calculator when its separate inputs and assumptions fit the question: A lifting index divides actual load by a recommended weight limit on the same mass basis.
References
Similar or alternative tools
- NIOSH RWL Load Constant Base Calculator
The Revised NIOSH Lifting Equation multiplies a load constant by six task multipliers.
- NIOSH Lifting Index LI Calculator
A lifting index divides actual load by a recommended weight limit on the same mass basis.