Standoff Insulators Tech Info

Stand-off Insulators

Stand-of Insulators are available in three product ranges: Isores, Glastic and RNC.

Isores Series

Isores insulators are suitable for indoor installation. They are manufactured from epoxy resin by the injection pressure gelation process. The high dielectric performance is achieved by casting under vacuum. All insulators are cast with sheds increasing voltage insulation and allowing installation of insulators in polluted environments. Brass inserts are cast in the top and bottom of the insulator body.

Isores Stand-off insulators are manufactured according to IEC660-1979 and recommendations no. 273-1979.

**Table 1 - Isores Stand-off Insulator Properties**
Part Number	Rated Volts kV	Flexion Strength kg	A	B	D	E	F	G	H	L	M	N	Creep mm	Mass kg
IGN10/0350	12	350	130	70	55	16	25	50	18	12	15	5	235	0.620
IGN10/0750	12	750	130	80	70	16	25	60	18	12	15	5	235	0.880
IGN15/0750	17.5	750	175	85	70	16	25	60	18	12	20	7	300	1.130
IGN20/0750	24	750	225	90	70	16	25	60	18	12	25	9	390	1.790
IGN30/0750	36	750	310	95	70	16	25	70	18	12	30	13	550	3.120

Glastic Series

Hi-Pot Tested to Assure Electrical Reliability
Glastic standoff Insulators are moulded of Underwriters Laboratories Incorporated� (UL) Recognized flame resistant fibreglass-reinforced thermoset polyester moulding compound. Glastic Insulators 1603, 2015, 1461,1872,1642 and 2450 are UL Recognized according to UL Standard for Safety 891. They feature shatter resistance and closer height tolerances than commonly available in porcelain insulators. Moisture and heat resistance properties of Glastic Insulators are higher than those of conventional plastic insulators.
Voltage Rating
This is only meant to be a guide for indoor service. Insulators mounted within a suitable electrical cabinet are considered indoors even though the cabinet itself is outdoors. An insulator will withstand its rated voltage continuously but industry standards or other specifications may require a different spacing from conductor to ground for a particular voltage. Wet or dirty conditions may require derating an insulator.
Outdoor Use
Glastic Insulators are primarily intended to be used indoors or inside a suitable enclosure. Insulators 1642 and 2450 should not be used upside down if there is a possibility of the centre hole filling with water.
Short Time Electrical Strength
For most insulator designs, this is the external flashover voltage in air. A few insulators will puncture instead. The value given is an average of 15 parts tested.
Cantilever Strength
One end of the insulator is bolted to a flat plate and force is applied to the insert on the other end in a direction parallel to the end at a distance from the plate equal to the insulator height.
Torque Strength
One end of the insulator is bolted to a flat plate and a normal steel bolt is tightened into the insert on the other end with a torque wrench. The bolt will fail before the insulator and the values published are approximately the values at which bolts fail. If you use tensile steel bolts, the insert threads will strip before the bolts fail, but at higher torque values than we publish. 5KV and 15kV insulators are tested differently.
UL Recognition
All Glastic Insulators are molded from UL Recognized molding materials (UL File E23525). When submitting your equipment to UL, you may need to furnish the molding material grade number used for a particular insulator. This information is available from Glastic Corporation. All of the molding materials used in Glastic Insulators have a generic relative Thermal Index of 130� C electrical/130� C mechanical. Glastic 1603, 2015, 1461,1892,1642 and 2450 Insulators are UL Recognized according to UL standard for Safety 891 (UL File E81713).

**Table 2 - Glastic Stand-off Insulator Dimensions.**
PART NO.	HEIGHT	THREAD SIZE	SUGGESTED INDOOR VOLTAGE RATING	SHORT TIME ELECTRICAL STRENGTH kV	WEIGHT POUND
1603-2D	1-3/8''	3/8'' X 16 X 3/8'' DEEP	600	10.0	0.19
1642-10E	3-1/2''	3/8'' X 16 X 9/16'' DEEP 2'' BOLT CIRCLE	5000	----	1.78
1872-1A	2-1/2''	3/8'' X 16 X 9/16'' DEEP	3200	51.4	0.44
1872-1C	3''	3/8'' X 16 X 9/16'' DEEP	4100	----	0.59
2015-3A	1-1/2''	3/8'' X 16 X 3/8'' DEEP	1500	33.4	0.20
2015-3B	1-3/4''	3/8'' X 16 X 3/8'' DEEP	2000	----	0.25
2015-3C	2''	3/8'' X 16 X 9/16'' DEEP	2300	43.1	0.31
2015-3D	2-1/4''	3/8'' X 16 X 9/16'' DEEP	2700	----	0.36
2165-1A	1''	1/4'' X 20 X 5/16'' DEEP	600	18.6	0.06
2165-1B	1-1/4''	1/4'' X 20 X 5/16'' DEEP	600	----	0.06

**Table 3 - Glastic Stand-off Insulator Physical and Electrical Properties.**
VALUES	2165	1603-2D	2015	1872	1642-10E
Tensile Strength (lbs.)	1000	2500	2,000	2,500	3,000
Cantilever Strength (inch lbs.)	400	1,800	1,750	3,000	6,000
Compression Strength (lbs.)	8000	20,000	20,000	25,000	20,000
Torque Strength (ft. lbs.)	12	30	50	50	200
Arc Resistance (sec.)	180	180	180	180	180
UL Subject 94 Flame Resistance	94 V-O	94 V-O	94 V-O	94 V-O	94 V-O
Height Tolerance (in.)	� .015	� .015	� .015	� .015	� .010
Creep Distance (in.)	Insulator Height	1-5/8	1/4 Plus Insulator Height	5/16 Plus Insulator Height	3-11/16
Dry Hi-Pot (volts) NEMA Specs.	----	----	----	----	19,000
Dew Hi-Pot (volts) NEMA Specs.	----	----	----	----	15,000
Impulse (volts, 1.5 x 40 wave)	----	----	----	----	60,000
Track Resistance (minutes)	600	600	600	600	600

RNC Series

RNC Series stand-off insulators are cast from epoxy resin and include a metric thread brass insert each end.

**Table 4 - RNC Stand-off Insulator** **Properties.**
Part Number	Rated Volts kV	Height mm	Thread
RNC660-35-M08	660	35	M8
RNC660-50-M08	660	50	M8
RNC660-50-M10	660	50	M10
RNC660-50-M12	660	50	M12

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Last modified: June 29, 2001