BS Pin Type Insulator Standard Porcelain Series Complete Product Specifications — P‑11‑Y to Pw‑33‑Y

Product Overview

BS Pin Type Insulator Standard Porcelains are designed for overhead power transmission and distribution lines with nominal voltages up to 33kV. They are mounted on pins on cross‑arms of utility poles, with grooves at the upper end to secure conductors by tying.

 

The series complies with British Standard (BS) 137, IEC 60383, and other international standards. Available in brown or white porcelain finish.

 

Table 1 – BS Pin Type Insulator Standard Porcelain Series General Ratings

BS Class	P‑11‑Y	P‑15‑Y	P‑20‑Y	P‑22‑Y	P‑33‑Y	P‑35‑Y	P‑44‑Y	PW‑15‑Y / Pw‑11‑Y	PW‑22‑Y / Pw‑22‑Y	PW‑33‑Y / Pw‑33‑Y
Nominal Voltage (kV)	11	15	20	22	33	35	44	15	22	33
Creepage Distance (mm)	240 – 254	298	432	432	630	864	864	432	673	851 – 900
Dry Arcing Distance (mm)	102	133	165	200	360	399	483	197	267	419

 

Table 2 – BS Pin Type Insulator Standard Porcelain Series Main Dimensions (mm)

BS Class	P‑11‑Y	P‑15‑Y	P‑20‑Y	P‑22‑Y	P‑33‑Y	P‑35‑Y	P‑44‑Y	PW‑15‑Y /Pw‑11‑Y	PW‑22‑Y / Pw‑22‑Y	PW‑33‑Y / Pw‑33‑Y
H – Height	130– 140	137	195	165	244	270	318	185	255	320
h – Depth of Thread	48	48	52.6	52.6	52.6	52.6	52.6	52.6	52.6	52.6
D – Diameter	140	152	230	229	280	270	343	170	205	240
d – Pin Diameter	18.3	18.3	27.8	27.8	27.8	27.8	27.8	27.8	27.8	27.8
R1 – Saddle Groove Radius	13	13	19	19	19	14	19	16	16	16
R2 – Wire Grooves Radius	9.5	11	14.3	14.3	13	14	14.3	16	16	16

 

Table 3 – BS Pin Type Insulator Standard Porcelain Series Mechanical Values

BS Class	P‑11‑Y	P‑15‑Y	P‑20‑Y	P‑22‑Y	P‑33‑Y	P‑35‑Y	P‑44‑Y	PW‑15‑Y / Pw‑11‑Y	PW‑22‑Y / Pw‑22‑Y	PW‑33‑Y / Pw‑33‑Y
Cantilever Strength (kN)	11	11	11	11	13	13	13	11	11	13
Approx. Weight (kg)	1.8	2.0	3.5	5.0	11.0	12.5	14.0	4.7	9.1	12.5

 

Table 4 – BS Pin Type Insulator Standard Porcelain Series Minimum Flashover Voltage (kV)

BS Class	P‑11‑Y	P‑15‑Y	P‑20‑Y	P‑22‑Y	P‑33‑Y	P‑35‑Y	P‑44‑Y	PW‑15‑Y / Pw‑11‑Y	PW‑22‑Y / Pw‑22‑Y	PW‑33‑Y / Pw‑33‑Y
Power Frequency Dry	75	80	100	100	135	140	155	100	125	140
Power Frequency Wet	50	55	60	60	95	100	110	65	95	110
50% Impulse Positive	115	130	160	160	180	215	240	150	190	210
50% Impulse Negative	150	175	205	205	290	295	305	190	235	245

 

Table 5 – BS Pin Type Insulator Standard Porcelain Series Withstand Voltage (kV)

BS Class	P‑11‑Y	P‑15‑Y	P‑20‑Y	P‑22‑Y	P‑33‑Y	P‑35‑Y	P‑44‑Y	PW‑15‑Y / Pw‑11‑Y	PW‑22‑Y / Pw‑22‑Y	PW‑33‑Y / Pw‑33‑Y
1 Min Power Frequency Dry	65	70	90	90	110	115	125	90	110	125
1 Min Power Frequency Wet	40	50	55	55	75	85	100	60	90	100
Impulse Withstand	90	110	140	150	170	190	200	140	180	200

 

Table 6 – BS Pin Type Insulator Standard Porcelain Series RIV Data & Puncture Voltage

BS Class	P‑11‑Y	P‑15‑Y	P‑20‑Y	P‑22‑Y	P‑33‑Y	P‑35‑Y	P‑44‑Y	PW‑15‑Y / Pw‑11‑Y	PW‑22‑Y / Pw‑22‑Y	PW‑33‑Y / Pw‑33‑Y
Test Voltage to Ground (kV)	15	15	22	22	30	35	44	22	30	44
Max RIV at 1000 kHz (μV)	8000	8000	12000	12000	16000	18000	25000	12000	16000	25000
Power Frequency Puncture (kV)	150	150	145	200	210	230	250	150	200	210

 

BS Pin Type Insulator Standard Porcelain Series Standards & Compliance

• Design Standard: British Standard (BS) 137, IEC 60383
• Material: High‑grade porcelain (ceramic)
• Color: Brown or white
• Applications: Overhead transmission and distribution lines up to 33 kV
• Mounting: Long leg for wooden cross‑arms; short leg for iron cross‑arms

 

BS Pin Type Insulator Standard Porcelain Series Model Naming Convention

Prefix / Suffix	Meaning
P	Standard Pin Type Insulator
PW / Pw	Variant design (typically enhanced creepage or anti‑fog performance)
-Y	British Standard (BS) series designation
Number	Nominal voltage rating (e.g., 11 = 11 kV, 33 = 33 kV)

 

BS Pin Type Insulator Standard Porcelain Series Key Features

• Superior anti‑fog performance — suitable for polluted environments
• Flexible installation — can be mounted vertically or horizontally
• High mechanical strength — cantilever strength up to 13 kN
• Excellent electrical insulation — high impulse and power frequency withstand voltages
• Full compliance with BS, IEC, and equivalent GB standards

 

Note: Specifications may vary slightly between manufacturers. The data above is compiled from one leading supplier Bonle (Fujian) Insulator Co., Ltd.. For precise dimensions and ratings, always refer to the official datasheet of your chosen supplier.

 

For certification, standard compliance, and procurement specifications, refer to:

1. IEC 60383 – Insulators for overhead lines – ceramic or glass insulator units for AC systems
2. Full Range of Pin Insulators – explore our complete product portfolio for transmission, distribution, and telecommunication lines

 

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