H1: ANSI 52-1 Suspension Insulator – 44kN Porcelain Suspension Insulator for Overhead Transmission Lines

ANSI 52-1 Suspension Insulator is a key suspension insulator designed for medium- to high-voltage overhead transmission lines.

Manufactured strictly in accordance with ANSI C29.2 standards, this ANSI 52-1 Suspension Insulator delivers outstanding mechanical endurance and reliable electrical insulation even in harsh outdoor environments.

Its cap-and-pin construction ensures stable mechanical performance under extreme temperature cycling from -40°C to +105°C.

Whether used in coastal salt-fog zones, industrial pollution areas, or remote desert regions, the ANSI 52-1 Suspension Insulator offers unparalleled reliability and durability.

For project engineers seeking a proven solution, the ANSI 52-1 Suspension Insulator provides a cost-effective choice for long-term service.

H2: ANSI 52-1 Suspension Insulator Technical Specifications

The ANSI 52-1 Suspension Insulator has a rated combined mechanical and electrical (M&E) failing load of 44kN (10,000 lbf), making it suitable for medium to heavy‑duty transmission applications. Its nominal creepage distance is 178mm, and the dry lightning impulse withstand voltage is 75kV, effectively preventing flashovers even in polluted coastal or industrial areas.

The disc diameter is 165mm (6‑1/2 inches), and the unit spacing is 140mm (5‑1/2 inches). The coupling hardware uses the standard clevis type, fully interchangeable per ANSI dimensional requirements, allowing direct replacement of old units without tower modifications.

Standard glaze colors are grey or brown. The porcelain body is manufactured by the wet process, and a zinc collar is optionally available.

Complete Technical Data per ANSI/NEMA C29.2A (both glaze colors):

S/N	Technical Standard Particulars/Details	Brown	Gray
1	Product Item No./SKU Code	52-1B	52-1G
2	Glaze Color	Brown	Gray
3	ANSI Class	52-1	52-1
4	Figure No.	1	1
5	Connecting hardware coupling	Clevis	Clevis
6	Disc diameter D/in.(mm)	6 (152)	6 (152)
7	Unit Spacing H/in.(mm)	5‑1/2 (140)	5‑1/2 (140)
8	Leakage distance /in.(mm)	7 (178)	7 (178)
9	M&E strength /lb(kN)	10000 (44)	10000 (44)
10	Tension proof /lb(kN)	5000 (22)	5000 (22)
11	Impact strength /in‑lb(N‑m)	45 (5.0)	45 (5.0)
12	Low‑frequency dry flashover voltage (kV)	60	60
13	Low‑frequency wet flashover voltage (kV)	30	30
14	Critical impulse flashover voltage, Positive (kV)	100	100
15	Critical impulse flashover voltage, Negative (kV)	100	100
16	Low‑frequency puncture voltage (kV)	80	80
17	Radio‑influence voltage data‑RIV (Test voltage to ground)（kV）	7.5	7.5
18	Radio‑influence voltage data‑RIV (Max. RIV at 1000kHz)（μV）	50	50
19	Net weight (kg)	2.5	2.5
20	Applicated Standard	ANSI C29.2A	ANSI C29.2A

H2: Material & Construction

Every unit of the ANSI 52-1 Suspension Insulator is made from high‑grade alumina porcelain, fired at over 1,300°C to achieve maximum density and near‑zero porosity. The cap is produced from malleable cast iron, and the pin from hot‑dip galvanised steel – both providing excellent corrosion resistance.

The cement bonding between porcelain and metal parts uses high‑quality Portland cement, ensuring stable mechanical performance under extreme thermal cycling from ‑40°C to +105°C. The hard, glossy glaze coating offers good self‑cleaning properties, reducing maintenance frequency. For more on porcelain manufacturing standards, visit the International Electrotechnical Commission (IEC).

H2: ANSI 52-1 Suspension Insulator Applications & Installation

The ANSI 52-1 Suspension Insulator is widely used on 69kV to 138kV AC overhead transmission lines, distribution networks, and substation entry towers. Typical string configurations are:

69kV – 4 to 5 discs per string
115kV – 7 to 8 discs per string
138kV – 8 to 9 discs per string

It can be assembled into single, double, tandem, or V‑strings to meet various tension and suspension requirements. Whether for urban grid upgrades or rural electrification projects, the ANSI 52-1 Suspension Insulator offers a cost‑effective and durable insulation solution. Standard coupling dimensions ensure full compatibility with existing clevis pins, sockets, and yokes. For live‑line maintenance, it allows easy hot‑stick handling, reducing outage time during replacement. Optional arcing horns and grading rings are available to optimise voltage distribution along the string.

Explore our full range of suspension insulators and transmission hardware for more options.

H2: ANSI 52-1 Suspension Insulator Quality & Performance Advantagess

Compared to polymer alternatives, porcelain offers unmatched resistance to UV radiation, bird pecking, and scratch damage. Its hydrophobic glaze reduces continuous water film formation, significantly raising pollution flashover voltage. Moreover, the ANSI 52-1 Suspension Insulator requires minimal routine maintenance and delivers a service life of over 50 years under normal operating conditions. Full testing procedures are detailed in ANSI C29.2, published by NEMA. For installation guidance, refer to our insulator string assembly guide.

Every unit undergoes 100% routine electrical and mechanical testing before dispatch, including visual inspection, dimensional checks, mechanical load tests, and high‑voltage withstand tests. Prototype tests – such as temperature cycling, thermal‑mechanical performance, and radio interference voltage (RIV) – are also performed per ANSI C29.2A. Full test reports and traceability records are provided for each batch.

Each insulator is individually packed with foam cushioning and secured in sturdy wooden crates or corrugated cartons to prevent transit damage. We offer flexible shipping options (FOB, CIF, EXW) with lead times of 15‑30 days depending on order quantity.

For detailed datasheets, CAD drawings, or competitive pricing on the ANSI 52-1 Suspension Insulator, please contact our sales team via the inquiry form below. We also offer OEM services and free technical consultation for string assembly design.

H2: Why Choose Our ANSI 52-1 Suspension Insulator

When selecting an ANSI 52-1 Suspension Insulator for your transmission project, quality and reliability are paramount. Our ANSI 52-1 Suspension Insulator is subject to strict quality control at every production stage – from raw material inspection to final electrical testing.

We understand that transmission line outages are costly, which is why each ANSI 52-1 Suspension Insulator is designed for long‑term durability.

With over a decade of experience in porcelain insulator manufacturing, we provide competitive pricing, fast delivery, and dedicated technical support. Whether you need a small sample batch or a full container order, our ANSI 52-1 Suspension Insulator is available with short lead times.