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Craig & Derricott
Grabwire Switches

Grabwire Switches

Product catalog summary

General Description
Grabwire switches offer continuous safety protection over long distances, suitable for machinery like conveyors. They replace multiple emergency stops with a single system, covering up to 2km with the Live-Wire system. Craig & Derricott provide two systems: the 'GW' range for up to 100m and the 'LW' range for up to 2km, both adhering to international safety standards.

Specifications
The switches are available in various models with different materials and spans, featuring die-cast aluminum or stainless steel enclosures, IP65 ingress protection, and rope tensioners. Electrical contacts vary by model, with ratings up to 16A/600V.

Connection Kits
These kits include all necessary components for installation, such as multi-strand steel cables, eyebolts, thimbles, shackles, and clamps, available for installation lengths up to 100m.

Installation Recommendations
Ensure maximum accessibility and place supports at 2m intervals. Avoid excessive bends and ensure the pull wire runs freely. For lengths over 100m, use the 'LW' system. Opt for stainless steel in wet environments.

Anchor Boxes
Anchor boxes eliminate the need for electrical cabling between switch units by using a mechanical latch system, requiring manual resetting after activation.

Accessories
Available accessories include indicator lamps, mounting kits, pull wires, eyebolts, pulleys, thimbles, shackles, and cable clamps.

Live Wire Grabwire System
This system is designed for long-distance protection, using a low voltage circuit that trips under various fault conditions. It requires manual resetting and is suitable for heavy-duty environments, including a control station and multiple Grab-Line switches.

Installation Parameters
The total circuit length must not exceed 2000m or 50 ohms resistance. The distance between switches should not exceed 150m, with supports every 2m. The control station requires a 110V or 240V AC supply.

Technical Specifications

Internal Components: Half wave rectified low voltage source from 110V or 240V a.c. supply, control circuit relay, fuse protection, terminal blocks for external connections.
Lid Mounted Components: On/Off switch, 'Supply On' indicator lamp (Blue), 'Reset' pushbutton, 'Reset System' indicator lamp (White), 'System Tripped' indicator lamp (Red).

CS1 Control Station Interior

Includes LG1 Grab-Line Switches available in LH, RH, and Mid versions housed in heavy-duty die-cast aluminum enclosures.
Internal Components: Chassis plate mounted safety rotary switch, terminal blocks, diode (LH & RH units only), bellows protected stainless steel 'pull shafts', M20 glands, thimbles, shackles, and clamps.
Lid Mounted Components: Manual 'Reset/Condition Indicator' knob, 'Signal to Reset' pushbutton.

Grab-Line Cable

Available in four lengths: 75M, 100M, 125M, 150M with a 2M allowance for 'making off'.
Features a thick outer sheath of red PVC, flexible steel wire armor, and three 1 sq mm flexible cores with Red, Green & Blue sheaths.

System Technical Data

Input Voltage: 110V (15W max.), 240V (15W max).
System Voltage: 24V a.c. - 1/2 wave rectified.
Control Circuit Relay: Positively operated contact, rated load 3A at 240V a.c., 3A (Resistive) at 24V d.c., max. switching current 6A, max. switching voltage 250V a.c. & 24V d.c., minimum permissible load 5V d.c. - 10mA, mechanical/electrical life 10 x 10⁶/10 x 10³, contact resistance 100 mΩ.
Power Protection Fuse: 2A.
Safety Circuit Fuse: 200mA.
Max. Grab-Line Circuit Resistance: 50 Ohms.
Pull Force to Operate: Approx 5kg.

Ordering Codes

Control Station Assembly: CS1
LH Grab-Line switch: LG1/L
RH Grab-Line switch: LG1/R
Mid Grab-Line switch: LG1/M
Grab-Line cable (75M): GWC 0038A
Grab-Line cable (100M): GWC 0038B
Grab-Line cable (125M): GWC 0038C
Grab-Line cable (150M): GWC 0038D
St St Eyebolt with fixing nuts: GWA 0070
Grab-Line Thimble: GWC 0031
Grab-Line Clamp: GWC 0032
Grab-Line ‘D’ shackle: GWC 0033
Cable gland: GWC 0039

Applications

Designed for flexibility in rolling stock repair pits.
For unusual or complicated applications, contact the technical sales team for advice.

Catalog excerpts

Apart from the Grabwire switch, the only other item required in a simple set-up, is the connection kit. In the kit you will fi nd all the parts necessary to install the system. Each kit includes:- Multi strand steel catenary cable with red PVC covering * Օ Stainless steel eyebolt supports. Suffi cient to support the cable at 2M intervals. Supplied complete with two fi xing nuts.* 2 x Stainless steel thimbles. Օ 2 x Stainless steel Dђ shackles. 2 x Stainless steel clamps. DescriptionCatalogue Ref.DescriptionCatalogue Ref. Basic connection kit *Catenary wire and eyebolts not included GK0010M Connection...

Open the catalog to page 2

Technical Data Sheet > Grabwire Switches > Dimensions GWDE Double Ended Grabwire Switch Page 4 Craig & Derricott Ltd Hall Lane, Walsall Wood, Walsall, West Midlands WS9 9DPt: +44(0)1543 375541 f: +44(0)1543 361619 e: [email protected]

Open the catalog to page 4

Designed specifi cally for long distance protection, where a tensioned wire installation (GW series) becomes expensive or impractical.Complying with the latest standards for safety installations, the Live Wire system incorporates the following safety features:- The trip switch interior to each grabwire assembly contains positive push-off contacts Օ The system will trip in the event of - (a) a Grab-Line being pulled in any direction. (b) a Grab-Line being broken or the Grab-Line circuit interrupted. (c) a short circuit condition occurring in the Grab-Line circuit. (d) a loss of power to the Control...

Open the catalog to page 5

The installed system must fall within the following parameters:-1 The total length of Grab-Line safety circuit will consist of - The feed from the CS1 Control Station to the fi rst Grab-Live switch Օ The Grab-Line run If connected, the two wire connection for conveyor interlock control The total of the above must not exceed 2000M or a total circuit resistance of 50 ohms.2 The distance between Grab-Line switches must not exceed 150M.3 The interconnections between Grab-Line switches is by the Grab-Line cable which must be secured to each of the Grab-Line switches by the attachments provided.4 The...

Open the catalog to page 6

Input Voltage 110V (15W max.), 240V (15W max) Control Station Assembly CS1 System Voltage 24V a.c. - 1/2 wave rectifi ed. LH Grab-Line switch LG1/L Control circuit relay Contact operation Positively operated Rated load 3A at 240V a.c. 3A (Resistive) at 24V d.c. Max. switching current 6A Max. switching Voltage 250V a.c. & 24V d.c. Minimum permissible load 5V d.c. - 10mA Mechanical/Electrical life 10 x 10 RH Grab-Line switch LG1/R Mid Grab-Line switch LG1/M Grab-Line cable (75M) GWC 0038A Grab-Line cable (100M) GWC 0038B Grab-Line cable (125M) GWC 0038C Grab-Line cable (150M) GWC 0038D St St Eyebolt...

Open the catalog to page 7

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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