As of GB (National Standard of China) explicitly defines or mandates the term “LTD” as a hoist type — nor does any GB standard use “LTD” as a formal technical designation in its clauses, tables, or normative references. Crucially:
✅ “LTD” (e.g., LTD6.3, LTD8) is not a standardized model code in GB documents — it is an industry-convention term, widely adopted by manufacturers and inspection agencies in practice, but absent from the official terminology of all current national standards.
✅ Verified against authoritative GB standards effective today:
GB/T 19155–2017 High-Place Work Suspended Platforms (superseding GB/T 19155–2003)
→ Defines requirements for suspended platforms (ZLP series), safety locks, steel wire ropes, and hoisting mechanisms.
→ Refers generically to “hoists”and classifies them by function (e.g., electric traction hoist, rope-climbing hoist) and performance (rated load, lifting speed, braking torque), but never uses “LTD”.
→ Annex B lists test items for hoists, including:
oStatic/dynamic load tests (Clause B.3.1),
oBrake slip distance & locking performance (B.3.3),
oOverload protection reliability (B.3.4),
oTemperature rise of motor/winding (B.3.5) ^^.
→ All tests apply to any hoist installed on a GB/T 19155-compliant suspended platform, regardless of whether labeled “LTD6.3” or “LSS80”.
GB/T 20303–2022 Electric Hoists — General Requirements
→ Covers general-purpose electric hoists, not specifically suspended platform hoists.
→ Explicitly excludes suspension-type climbing hoists used in high-place work platforms (Scope, Clause 1):
“This standard does not apply to rope-climbing hoists (e.g., those used in suspended access equipment per GB/T 19155).”
→ Hence, LTD-type hoists fall outside GB/T 20303’s scope — they are governed instead by GB/T 19155 + JG/T 5033–202X (see below).
JG/T 5033–202X Hoists for Suspended Platforms (the latest industry standard, replacing JG/T 5033–1993)
→ Though not a GB, this Ministry of Housing and Urban-Rural Development (MOHURD) standard is mandatory for construction applications, referenced in safety supervision documents ^^.
→ It does define technical requirements for rope-climbing traction hoists, including:
oRated load (e.g., 6.3 kN ≈ 630 kg → corresponds to “LTD6.3”),
oMinimum rope diameter compatibility (≥8.3 mm for LTD6.3),
oBrake locking time ≤ 0.5 s under rated load,
oNo-slip performance under 125% overload for ≥15 min ^^.
→ While JG/T 5033–202X still avoids the label “LTD”, it de facto standardizes the performance envelope that manufacturers label “LTD6.3”, “LTD8”, etc. — making “LTD” a de facto shorthand for JG/T 5033-compliant rope-climbing hoists.
✅ Conclusion:
There is no GB standard that “specifies LTD hoist testing” — but JG/T 5033–202X (together with GB/T 19155–2017) provides the full, enforceable technical and test framework for the hoists universally labeled “LTD” in the吊篮 industry. Their test requirements include static/dynamic load, brake reliability, thermal endurance, noise, and electromagnetic compatibility (EMC) — all verified by certified institutions (e.g., Beijing Construction Machinery Testing Center) before issuance of the Special Equipment Type Test Certificate.
Post time: Aug-08-2025