The metallic sheath prevents the ingress of moisture, while the armour protects the cable from damage from foreign objects.
Minimum coverage for non vehicular areas; for conductors or cable not having a metal sheath or armour, under 750 volts, the required depth is 600 mm. For conductors or cable having a metal sheath or armour, under 750 volts, the required depth is 450 mm. Minimum coverage for vehicular areas; for conductors or cable not having a metal sheath or armour, under 750 volts, the required depth is 900 mm. For conductors or cable having a metal sheath or armour, under 750 volts, the required depth is 600 mm.
The cleft between the internodes of the myelin sheath is called the node of Ranvier. This region is important for the propagation of action potentials along the axon.
The most common type of wiring found in houses is non-metallic sheathed cable, known as NM or Romex. It consists of a plastic-coated sheath enclosing insulated wires that carry electrical current throughout the building. NM cable is easy to install and provides a safe and reliable means of wiring a house.
Surrounding the myelin sheath, there is a thin membrane called neurilemmal sheath. This is also called neurilemma or sheath of Schwann. This contains Schwann cells, which have flattened and elongated nuclei. The cytoplasm is thin and modified to form the thin sheath of neurilemma enclosing the myelin sheath. One nucleus is present in each internode of the axon. The nucleus is situated between myelin sheath adn neurilemma. At the node of Ranvier (where myelin sheath is absent), the neurilemma invaginates and runs up to axolemma in the form of a finger like process. In nonmyelinated nerve fiber, the neurilemma continuously surrounds axolemma. Neurilemma is absent in central nervous system. Neurilemma is necessary for the formation of myelin sheath (myelinogeneis).
Wires have to be insulated from each other to confine the current inside the wire. Most wires are insulated with a pvc sheath surrounding the copper wire.
The NM represents the type of sheath on the cable. NM stands for Non Metallic sheath cable..
Aluminium conductor. XLPE. Nonmagnetic armour, PVC outer sheath
Minimum coverage for non vehicular areas; for conductors or cable not having a metal sheath or armour, under 750 volts, the required depth is 600 mm. For conductors or cable having a metal sheath or armour, under 750 volts, the required depth is 450 mm. Minimum coverage for vehicular areas; for conductors or cable not having a metal sheath or armour, under 750 volts, the required depth is 900 mm. For conductors or cable having a metal sheath or armour, under 750 volts, the required depth is 600 mm.
'A' - Aluminum '2X' - XLPE Insulation 'F' - Steel Strip Armour 'y' - PVC Insulation 'W' - Steel Round Wire Armour 'y' - PVC Outer Sheath 'ww' - Steel Double round wire Armour 'yy' - Steel Double Strip Armour 'Wa' - Non Magnetic round wire Armour 'Fa' - Non Magnetic flat strip Armour AYFY Means Aluminum PVC Insulated Flat strip Armour and PVC outer sheath cable
Cable sheath current is a current induced in the sheath by radio, magnetic or other interference, or a fault condition. The cable sheath should be grounded at one end so that this current flows to ground safely.
You could say:"His sword made a clanking sound as he withdrew it from his sheath."Or:"His sword made a metallic sound as he withdrew it from its sheath.""The painful zing of steel upon steel."Wolfgang Schwartzschild'the quiet but menacing whisper of the sword was heard as it was drawn from its sheath' because it sounds kind of like 'sssssshhh'
'A' - Alluminium '2X' - XLPE Insulation 'F' - Steel Strip Armour 'y' - PVC Insulation Now As per A2XWY - This describes that it is Aluminum cable, XLPE insulated, With Steel round wire armour and having PVC outer Sheath.
In the fatty myelin sheath there are gaps between the axons. The myelin sheath gaps are referred to as the nodes of Ranvier.
The cleft between the internodes of the myelin sheath is called the node of Ranvier. This region is important for the propagation of action potentials along the axon.
The most common type of wiring found in houses is non-metallic sheathed cable, known as NM or Romex. It consists of a plastic-coated sheath enclosing insulated wires that carry electrical current throughout the building. NM cable is easy to install and provides a safe and reliable means of wiring a house.
There are 2 definitions of "sheath". I have one sentence with one definition of "sheath". Put the sheath back on the knife!
The material surrounding the axon that increases the speed of the nerve impulse is the myelin sheath. It is made of fatty substances and acts as an insulator, allowing for faster conduction of the electrical signal along the axon. Nodes of Ranvier are the gaps in the myelin sheath where the signal jumps between to speed up transmission.