6.1.2 It is also recognized that, in practice, a system may be an admixture of type for the purposes of this code, earthing systems are designated as follows: a) TN-S System (for 240 V single phase domestic/ commercial supply) — Systems where there are separate neutral and protective conductors throughout the system. A system where the metallic path between the installation and the source of energy is the sheath and armouring of the supply cable (see Fig. 2). b) Indian TN-S System (for 415 V three-phase domestic commercial supply) — An independent earth electrode within the consumer's premises is necessary (See Fig. 3 ) . c) Indian TN C-System — The neutral and protective functions are combined in a single d) Couductor throughout the system ( f o r example earthed concentric wiring (see Fig. 4). TN-C-S System — The neutral and protec- tive functions are combined in a single conductor but only in part of the system (see Fig 5). e) T-TN-S System (for 6•6/11 kV three-phase bulk supply) — T h e consumers installation, a TN-S system receiving power at a captive substation through a delta connected transformer primary (see Fig. 6 ) . f) TT System (for 415V three-phase industrial supply) — Same as 6.1.1 (b) (see Fig 7.). g) IT System — Same as 6.1.1 (c) ( see Fig. 8 ). We, at Atul Casting and Metal Works manufactures all earthing related products such as G.I Strips, G.I plates, G.I Rods, G.I Pipes, C.I covers, Cable Trays, G.I Wire, Manhole Covers and Route Markers for past 50 + Years in heart of New Delhi. Call us at +91 9873361672 for best deals.