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“Finger Grips”

FINGER GRIPS are flexible wire mesh devices designed in such a manner that they have an automatic holding action. We all remember the Chinese “finger grips” we played with as children. Made from strips of bamboo, you could insert your two index fingers from each and easily. As you then pulled, the finger grips tightened. The mesh grips we show below are a very sophisticated up-date to those toys. When used properly, they supported the weight of the trailing extension cord and prevent stress on the wiring device and the possible pull-out of the conductors from the wiring device.

ATTACHEMENT STYLES

SINGLE EYE-

The Single Eye is used when the cable is vertical or when it bends. The eye is quickly attached to an open hook, projection, rod, or a shackle.

DOUBLE EYE-

By using these with a shackle, the double eye can be used in place of a universal bale around a structural member of a suspended platform and has the added advantage of being suitable for use with a single eye finger grip when connecting two extension cords in tandem.

UNIVERSAL BALE–

The bales have recommended minimum diameters of the pipe to which they are to be attached ranging from ½” to 1-1/4” depending upon the bale selected. Therefore they could be attached to a suitable suspended platform structural member but would not be recommended for a single eye or double eye hook-up.

UNIVERSAL BALE – The bales have recommended minimum diameters of the pipe to which they are to be attached ranging from ½” to 1-1/4” depending upon the bale selected. Therefore they could be attached to a suitable suspended platform structural member but would not be recommended for a single eye or double eye hook-up.

MATERIALS AVAILABLE

SM- Standard Mesh: Tin coated bronze- nonmagnetic

SS-Stainless Steel: Used when higher tensile strength is required or when severe service or unusual atmospheric conditions are expected.

MESH TYPES

The close mesh is used before attaching plugs and connectors.

When the end of the cable is not available or it is determined that too much labor is required to make ends available (i.e. Plug, connectors and boots are already assembled) then the split grip is wrapped around the cable and is secured with a steel rod.

SIZES

As new raw chemical ingredients are introduced to manufacturers of electric cable, their engineering staffs decide how to balance various advantages so as to arrive at the best formula. The only constraint is the UL requirements that they must meet. There are no formulas that they must follow. For this reason, different manufacturers have different weights and different minimal ODs. We are concerned here with nominal ODs. Essex, Excel and Royal are all owned by the same company. A/W is a division of Leviton. We use these two sources.

			CLOSED MESH		SPLIT ROD
FOR WIRE SIZE		ATTACHMENT DESCRIPTION	SM CATALOG NO	SS CATALOG NO	SM CATALOG NO	SS CATALOG NO
AIW	EXCELL	ATTACHMENT DESCRIPTION	SM CATALOG NO	SS CATALOG NO	SM CATALOG NO	SS CATALOG NO
10/3SO 10/4SO 8/3SO 8/4SO	10/3SO 10/4SO 8/3SO	Single Eye Universal Bale Double Eye	41101 41103 41105	41107 41109 41111	41120 41122 41124	41126 41128 41130
.	8/4SO	Single Eye Universal Bale Double Eye	41141 41143 41145	41147 41149 41151	41160 41162 41164	41166 41168 41170
16/6 Control	.	Single Eye	41180	.	.	.

SUGGESTED HOOK-UP
• Illustrated is a hook-up that could easily be a standard for a suspended platform inventory. Shown is the detail of two extension cords in tandem.
• The top cord shows the plug, protected by a boot and furnished with a single eye finger grip.
• The bottom cord has a boot protected connector and the cord has a double eye finger grip attached.
• A shackle completes the assembly with the finger grips and shackle bearing all of the weight
• The plug and the connector do not bear any of the weight of the trailing cord.

SIMPLE INVENTORY
• If every extension cord is equipped with a single eye attachment on the plug end and a double eye attachment on the connector end, no other arrangements are necessary.
• The first cord could then be attached with the double eye finger grip attachment and a shackle to a structural member of the suspended platform.
• No finger grip is required on the molded “Y” since it bears no weight. Cords can then be continuously hooked-up in tandem up to a safe limit.

SAFETY FACTORS
The manufacturers of the cable restraints take a plus or minus 20% on their rated loads.
We will choose a conservative route and take minus 20% or multiply..x.. .8.

Allowed Load= the braking strength ..x...8..x	1
	Recommended safety ratio.

Length of Cable=	allowed load.. x ..1000
	Cable weight per 1000ft

Therefore a standard mesh with breaking strength of 790 lbs. Is computed as follows: 790..x...8.. x..¼ (4 to 1 safety margin) = Allowed load of 158 lbs.

Maximum length of cable would be:	158..x ..1000	=501 feet
	315 (lbs. Per thousand feet 10/3 SO )

Stainless Steel= additional 75% or 875 feet.