All electrical wiring products in North America have to be UL or CSA approved. These are an independent testing laboratories that test products to destruction. The product is then given a range in which the product can be used. When you are looking for electrical products check for the UL or CSA approval stamps. If it is not on the product do not use it as your insurance company will use the non approved product clause if you make a claim on damage that the non approved product caused.
Electricians can be fined if caught connecting non approved products. Be aware that there is a lot of off shore counterfeit products in the marketplace.
the electrical cable become tight
Sometimes called an extension cable or power board, it "lengthens" the reach of your electrical outlet.
WIRE
Not enough information. If you mean an electrical cable, no it is not safe unless you have isolated it and verified that it is no longer "live"!
Cable Glands cover the whole spectrum of armoured and non-armoured cable and applications from general industrial through increased safety, deluge, flameproof and explosion proof. The Cable Glands are available in Brass as standard with Stainless Steel, Plastic and Aluminium, as an optional material on certain designs. Generally they are used by oil and gas units, electrical cable sealing companies and marine applications. Depending on the applications they are many type of cable gland available like indoor cable glands, outdoor cable glands and cable gland accessories like PVC shrouds, lock nuts and cable ties.
As long as the cables have the UL or CSA certification stamped on the cable both are good. The deciding factor should be the cost of one over the other. Beware of knock offs coming into the market place from off shore countries. Using these products could be a concern if you have to make a claim on your house insurance.
what should be the distance between instrument cable and electrical cable
Most industrialised countries manufacture electrical cable.
the electrical cable become tight
cable tv
Because the circle cross-section has the highest area to mass ratio. High area leads to better conductivity and low mass makes cheaper cable.
electrical
A device designed to permit the entry of a cable into an electrical equipment and which provides sealing and retension. Cable well tightened with supporting of cable holding material into an electrical equipment or panels.
Copper cable with PVC insulation
Cable
Electric.
An electrical conduit is a system for routing and protecting electrical wiring. A cable conduit can be found wherever electrical wiring is needed. This includes wiring in appliances or in the walls of a home.