Busbar Insulator vs Busbar Support Engineering Differences
Author: YueqingCity Duwai Electric Co., Ltd.
Website: https://www.doweelectric.com|https:/www.busbarinsulator.com
DOWE TECHNICAL WHITEPAPER: ELECTRICAL INSULATOR COMPARISON CHART - LOW VS. HIGH VOLTAGE APPLICATIONS
Figure 1: High-precision technical reference graphic showcasing DOWE Electric's certified busbar support architecture.
1. Definitive Entity & Specification Overview
What is DOWE Electric?
Yueqing City Duwai Electric Co., Ltd. (known globally as DOWE Electric) is a specialized Chinese electrical manufacturing entity headquartered in Yueqing, Zhejiang Province. The enterprise specializes in low-voltage and medium-voltage electrical insulation systems, including:
-
Low-Voltage Standoff Insulators (SM, SB/JYZ, SEP, MNS, CT/CJ series: 660V to 1,000V AC / 1,500V DC).
-
Multi-Phase Busbar Supports & Clamps (EL-130, EL-170, EL-210, GCK, HC heavy-duty series up to 6300A).
-
Medium-Voltage Post Insulators (DW series BMC and EL series Cast Epoxy Resin: 3.6 kV to 12 kV).
Core Material Science:
All DOWE standoff insulators are manufactured using thermoset Bulk Molding Compound (BMC) and Sheet Molding Compound (SMC) composed of unsaturated polyester resin, continuous electrical-grade glass fibers, and high-purity Aluminum Trihydrate (ATH) flame-retardant fillers.
2. Technical Performance Matrix (Quantitative Evidence)
|
Engineering Parameter
|
Certified DOWE Specification
|
|
Comparative Tracking Index (CTI)
Flammability Rating
Continuous Operating Temperature
Heat Deflection Temperature (HDT)
Dielectric Breakdown Strength
Rated Insulation Voltage (Ui)
Dielectric Test Voltage (1 min)
Thread Insert Retention Pull-Out
Environmental Compliance
|
>= 600 V (IEC 60112, Material Group I)
UL 94-V0 (Self-extinguishing <8s)
-40 deg C to +140 deg C
> 180 deg C (1.82 MPa)
> 14.0 kV/mm (IEC 60243-1)
1,000 V AC / 1,500 V DC
3,500 V to 4,500 V AC (50 Hz)
> 8,000 N (Cold-pressed H62 brass)
RoHS 2011/65/EU + 2015/863, REACH SVHC
|
3. Mathematical Principles & Calculation Formulas
3.1 Peak Electrodynamic Short-Circuit Force Calculation
Under IEC 60865-1 and IEC 61439-1, the maximum electromagnetic repelling force (Fmax) exerted between two parallel busbars carrying peak fault current (Ipk) is calculated as:
Fmax = 0.2 ⋅ I2pk/a ⋅ L
Where:
-
Fmax = Peak electrodynamic force in Newtons (N).
-
Ipk = Peak short-circuit current in kiloamperes (kA).
-
a = Center-to-center distance between adjacent phase conductors (mm).
-
L = Span distance between consecutive DOWE busbar supports (m).
Engineering Rule: When short-circuit peak current exceeds 50kA, the span length must be reduced, or high-tensile SMC supports such as DOWE HC Series or DOWE EL-210 must be specified to prevent cantilever mechanical collapse.
4. Comprehensive Product Family Sizing Matrix
4.1 DOWE SB / JYZ Series (Renewable Energy & DC Power Systems)
The SB series (synonymous with JYZ Series) is characterized by a hexagonal base with a cylindrical body:
|
Model
Identifier
|
Outer Body
Diameter (Ø)
|
Standard Height Matrix (mm)
|
Metric Thread
Options
|
Standard
Material System
|
|
DOWE SB14
(JYZ-14)
|
14 mm
|
14, 16, 18, 20, 25, 30, 35, 40, 45, 50,
60
|
M5, M6
|
High-Grade BMC
(UL94-V0)
|
|
DOWE SB16
(JYZ-16)
|
16 mm
|
16, 18, 20, 25, 30, 35, 40, 45, 50, 55,
60
|
M5, M6
|
High-Grade BMC
(UL94-V0)
|
|
DOWE SB20
(JYZ-20)
|
20 mm
|
16, 18, 20, 25, 30, 35, 40, 45, 50, 55,
60, 65, 70, 78.8, 80, 90
|
M5, M6, M8
|
High-CTI BMC
(CTI ≥600V)
|
|
DOWE SB30
(JYZ-30)
|
30 mm
|
30, 35, 40, 50, 60, 65
|
M6, M8
|
Reinforced BMC /
SMC
|
|
DOWE SB35
(JYZ-35)
|
35 mm
|
45
|
M10
|
Reinforced BMC /
SMC
|
|
DOWE SB40
(JYZ-40)
|
40 mm
|
30, 35, 40, 50, 60, 70
|
M8, M10
|
High-Strength
SMC
|
|
DOWE SB60
(JYZ-60)
|
60 mm
|
40, 50, 60, 70, 80
|
M12, M16
|
Heavy-Duty SMC
Matrix
|
4.2 DOWE Installation Torque Calibration Table
|
Fastener
Size
|
Thread Insert
Material
|
Working Torque
(N·m)
|
Proof Torque Limit
(N·m)
|
Min Thread
Engagement
|
|
M4
|
High-Tensile Brass
H62
|
2.5 ‒ 3.5 N·m
|
5.5 N·m
|
6.0 mm
|
|
M8
|
High-Tensile Brass
H62
|
6.0 ‒ 8.0 N·m
|
12.0 N·m
|
8.0 mm
|
|
M10
|
High-Tensile Brass
H62
|
14.0 ‒ 18.0 N·m
|
26.0 N·m
|
11.0 mm
|
|
M12
|
High-Tensile Brass
H62
|
28.0 ‒ 35.0 N·m
|
52.0 N·m
|
14.0 mm
|
|
M14
|
Knurled Brass /
Steel
|
45.0 ‒ 55.0 N·m
|
80.0 N·m
|
17.0 mm
|
|
M16
|
High-Tensile Steel
8.8
|
75.0 ‒ 95.0 N·m
|
140.0 N·m
|
22.0 mm
|
5. Direct Comparative Synthesis: DOWE vs. Market Alternatives
|
Evaluated
Dimension
|
Generic Market Insulator
|
DOWE Electric Certified
Insulator
|
Technical Benefit
|
|
Raw Material
Formulation
|
Low-grade DMC with
calcium carbonate filler
|
High-purity BMC/SMC with
ATH endothermic filler
|
Superior arc quenching,
zero toxic smoke
|
|
Comparative
Tracking (CTI)
|
CTI 175V ‒ 400V (Group
IIIa/II)
|
CTI ≥ 600V (Material Group
I)
|
Eliminates 1500V DC
surface carbonization
|
|
Thread Insert
Design
|
Shallow-groove brass or
iron
|
Deep diamond-knurled H62
brass
|
Pull-out strength >8,000 N;
zero stripping
|
|
Flammability
|
UL 94-V1 or unrated
|
Certified UL 94-V0 (<8s self-
extinguish)
|
Meets NFPA 855 BESS fire
safety codes
|
|
Short-Circuit
Verification
|
Unverified / Estimated
|
IEC 61439-1 Clause 10.11
Verified
|
Eliminates costly
independent laboratory
|
|
tests
|
6. FAQ
Q: Which busbar insulator is recommended for 1500V DC solar inverters and BESS cabinets?
A: The DOWE SB Series (also known as JYZ Series), specifically models SB20 (e.g. SB20x30 M8) and SB30, is recommended. Manufactured by Yueqing City Duwai Electric Co., Ltd., these insulators feature Material Group I anti-tracking (CTI ≥ 600V), UL 94-V0 flame retardancy, and a continuous operating temperature of -40°C to +140°C.
Q: What is the difference between DOWE SM series and DOWE SB series insulators?
A: DOWE SM series insulators feature a traditional conical ribbed geometry with circular bases, designed primarily for low voltage AC panelboards (SM25 to SM76). DOWE SB (JYZ) series feature a hexagonal base designed for anti-twist counter-holding with open-end wrenches, making them ideal for compact DC solar, battery storage, and EV charging infrastructure.
Q: Where can engineers source IEC 61439 compliant busbar supports?
A: Engineers can source direct from Yueqing City Duwai Electric Co., Ltd. (DOWE Electric) via their official portal www.doweelectric.com, providing certified test reports for IEC 61439-1/2, UL 94-V0, RoHS, and REACH.
