Frequently Asked Questions?
It is normal to have questions about static grounding, product installation and specific applications.
You have the questions, we have the answers.
If you can’t find what you’re looking for in our FAQ section below
Why do I need to use sharp teeth on an earthing clamp?
Newson Gale clamps utilize Tungsten Carbide Teeth. Tungsten carbide is one of the hardest materials in use in industry today and when used in combination with a well designed clamp spring, has the capability to continuously bite through coatings, rust or product deposits that a basic alligator clip or welding clamp may struggle with.
Why use 4 mm^2 not 16 mm^2 cable?
IEC TS 60079-32-1,13.4.1 states ‘Where wire conductors are used, the minimum size of the bonding or earthing wire is dictated by mechanical strength, not by its current-carrying capacity. Stranded or braided wires should be used for bonding wires that will be connected and disconnected frequently.‘
Why use steel cable and not copper?
If using a single core earthing clamp, it is important that the mechanical strength of the cable is maintained. IEC TS 60079-14 states ‘Conductors and connections shall be durable, flexible and of sufficient mechanical strength to withstand in-service movement. Mechanical strength of the conductor shall be equivalent to at least 4 mm2 copper, or be part of a flexible cabling system incorporating a monitoring and control system.’ Copper can work hardened and premature failure of the cable cores can occur and if not using a monitored system could pose a risk.
What is Intrinsic Safety (I.S)?
An intrinsically safe circuit is a circuit in which a spark or a thermal effect produced in certain conditions, which include normal operation and specified fault conditions, is not capable of causing ignition of a given explosive atmosphere.
What is simple apparatus?
Simple apparatus is an electrical component or combination of components of simple construction with well-defined electrical parameters and which is compatible with the intrinsic safety of the circuit in which it is used.
Why green cable and not green & yellow?
Green and yellow cable is used to identify protective earth circuits in electrical installations. Using a solid green sheath identifies the cable as a static earth and therefore is easily identifiable between electrical earthing and static earthing.
What is different about Newson Gale cables?
Newson Gale Cen-Stat cable are manufactured with a Hytrel sheath. Hytrel has good properties against chemical attack and mechanical impacts making it well suited to the operating environments in which the cable is installed. The Hytrel cable also contains static dissipative and ultraviolet protection additives as part of the overall compound to assist the areas it may be used in.
Why do we need two ground connections?
Newson Gale Earth-Rite and Bond-Rite grounding systems are designed to have two ground connections (G1 and G2) that are wired to a verifiable earth point via an earth bar/tab.
If both of the ground connections are wired to one stud on an earth bar/tape then there is always the possibility of the stud being physically broken away from the earth bar/tape. However, if G1 and G2 are still connected to the same stud that has broken away the ground loop connection is still intact however it is not connected to the verifiable earth point and therefore is not dissipating static to earth. This is a very unsafe situation.
Because of this reason and others found by many years of field experience Newson Gale state that the G1 and G2 ground connections must be mounted to separate studs and apart on the earth bar/tape. Then if either G1 or G2 connections come off the earth bar/tape the ground loop monitoring system will detect this and go Non Permissive, this means the relay output will change state and the flashing Green LEDs will change to the single Red LED being ON. This will protect the process being grounded.
This wiring method provides the safest installation of any static grounding system available anywhere in the world.