Compliance
What is documented, and what is not.
A North American buyer cannot specify a heater on a claim — they need a certificate number, a scheme and a scope. This page separates the two categories and does not blur them. If an approval you need is in the second list, it is a gap today, and we would rather you knew that before you designed us in than after.
01On file today
Evidence exists for these.
Each of these is stated in the manufacturer's own product documentation or is a measured value recorded at final inspection.
- JB/T 2379-93Documented
Metal-sheathed tubular heating elements (China machinery standard)
The tubular series are built and life-tested to this standard; the manufacturer states several indices exceed it.
- Insulation resistance ≥ 1 MΩDocumented
Measured at 500 V DC before dispatch
Elements below this figure are dried at approximately 200 °C (392 °F) until resistance recovers.
- Dielectric strength 2 kV / 1 minDocumented
Withstand test at final inspection
Applied with the sheath earthed; working voltage limited to 1.1 × rated.
- 0Cr25Al5 resistance wireDocumented
Iron-chrome-aluminum alloy, Beijing Ganghua brand
Named supplier and grade for the resistance wire used across the tubular range.
02Open items
Required in North America, not yet held.
These are the approvals a US or Canadian buyer most often needs. None of them is currently on file. Each row names who it actually blocks, so you can see whether it affects your project.
03North American build options
What can be built to your standards today.
Certification is a gap; hardware compatibility is not. These options are cut and wound to order regardless of what marks the product carries.
Voltage
- 120 V
- 208 V
- 240 V
- 277 V
- 480 V
- 600 V
60 Hz windings. Catalog part numbers are 220 / 380 V at 50 Hz.
Thread forms
- NPT
- BSP
- Metric fine (catalog standard)
Metric fine — M22×1.5 and M27×1.5 — is the catalog standard.
Flange standards
- ANSI B16.5 150# / 300#
- DIN PN16 / PN40
- JIS
- GB (catalog standard)
Send the standard, size and class rather than a bolt-hole count.
Terminal enclosures
- NEMA 1 / 4 / 4X (on request)
- IP54 / IP65 (catalog standard)
Rating follows where the heater lives, not the element itself.
Incoterms
- EXW Taizhou
- FOB Shanghai
- FOB Ningbo
- CIF
- DDP (on request)
Payment terms
- T/T 30% deposit / 70% before shipment
- L/C at sight
- Net 30 on approved account
Customs
- 8516.80 — electric heating resistors
- Marked country of origin per 19 CFR 134
Classification is the importer's responsibility — confirm with your broker.
Documents supplied
- Insulation resistance readings
- Dielectric test results
- Dimensional conformity report
- Hydrostatic test (pressure assemblies)
04Questions
Compliance FAQ
Are these heating elements UL listed or CSA certified?
Not at present. UL 1030 and UL 499, and the Canadian equivalent CSA C22.2 No. 72, are open items — requested but not yet on file. If your project requires a certified component, say so at enquiry stage: we will tell you where the certification stands before you design us in, rather than after. The tubular series are built and life-tested to JB/T 2379-93, the Chinese machinery standard for metal-sheathed tubular heating elements.
Can you supply an ASME U-stamped pressure vessel?
Not currently. ASME Section VIII Division 1 construction with a U-stamp is an open item, and it affects explosion-proof heater vessels and packaged steam generators specifically — not bare tubular elements, which are not pressure vessels. For Canadian installations a CRN is also required and is likewise not yet held. Ask before specifying either product into a jurisdiction that requires them.
What hazardous-location certification do the explosion-proof heaters carry?
The construction is flameproof — a sealed terminal enclosure over a flanged tube bundle — but it does not currently carry a North American Class I Division 1 or Division 2 listing under NEC 500, nor an ATEX or IECEx certificate. That is an open item. Tell us the area classification, gas group and the scheme your site works to at enquiry stage: building to the correct scheme from the start is far cheaper than re-assessment afterwards.
What test documentation ships with an order?
As standard: insulation resistance readings taken at 500 V DC, dielectric withstand results at 2 kV for one minute, and dimensional conformity against the approved drawing. Hydrostatic test results accompany flanged and boiler assemblies. Mill test reports to EN 10204 3.1 for sheath alloys can be supplied on request, though a sample certificate is not yet on file here.
How is country of origin handled for US customs?
Goods are marked with country of origin in line with 19 CFR 134. The usual classification for electric heating resistors is HS 8516.80, but classification is the importer's responsibility and should be confirmed with your customs broker against the specific article. We supply the commercial invoice, packing list and any certificate of origin your entry requires.
Do you have ISO 9001 certification?
It is an open item, not a current claim. In-process control is real — every element is meggered and dielectric-tested before dispatch and the tubular series are life-tested to JB/T 2379-93 — but that is a set of controls, not a certified management system. Buyers whose vendor onboarding requires an ISO 9001 certificate should treat this as a gap today.
Need an approval that is not held yet? sales@jqheating.com — we will tell you where it stands and what obtaining it would add to lead time.