House Wiring Cable size

House Wire

Single Core PVC Insulated Multistrand Copper Conductor (unsheathed) heavy duty cables for house wiring voltage grade 650/1100 V (Conforming to NS:344/2052).

Size	Numbers and Diameters of Wires (mm)	Nominal Thickness of Insulation (mm)	Conductor Resistance at 20 C/km (max)	Current Rating (Amps)
1/18	1/1.12	0.70	17.58	12
3/22	3/0.737	0.70	13.76	12
3/20	3/0.914	0.70	8.927	16
7/22	7/0.737	0.80	5.879	22
7/20	7/0.914	0.80	3.815	29
7/18	7/1.12	0.80	2.555	37
7/16	7/1.63	1.00	1.207	68

Single Core PVC Insulated Multistrand Copper Conductor (unsheathed) heavy duty cables for house wiring voltage grade 650/1100 V (Conforming to NS:344/2052).

Nomial CS area of conductor (sq mm)	Number and dia of wires (mm)	Nomial thickness of Insulation (mm)	Conductor resistance ohm/km (max) at 20 C	Current carrying capacity in conduit/trunking (amps)	2 cables single 0 enclosed clipped directly to a surface or on cable trays (amps)
1.0	14/0.3	0.7	18.1	11	12
1.5	21/0.3	0.7	12.1	13	16
2.5	36/0.3	0.8	7.41	18	22
4.0	56/0.3	0.8	4.96	24	29
6.0	85/0.3	0.8	3.3	31	37
10	80/0.4	1.0	1.91	42	51
16	126/0.4	1.0	1.21	57	68
25	196/0.4	1.2	0.78	71	86
35	276/0.4	1.2	0.554	91	110
50	396/0.4	1.4	0.386	120	145

Analogies between magnetic circuits and electrical circuits

Analogies between magnetic circuits and electrical circuits are easy to be made by comparing electric circuit and magnetic circuit.

• The magnetic flux Φ which flows( not actually flow but sets up) through a magnetic circuit, corresponds to the electrical current / which flows through an electrical circuit;

EMF Equation of Transformer

Figure 1 shows the representation of alternating flux, varying sinusoidally, which increases from its zero value to maximum value (F_m) in one-quarter of the cycle, that is in one-fourth of a second where f is the frequency of AC input in hertz.

Power and Power Factor

  The component of current  which is in phase with the applied voltage () and contributes to active or true power of the circuit is known as active or watt-ful or in phase component of alternating current

and the component of current which is perpendicular to applied voltage () and contributes to reactive power of the circuit is known as reactive or watt-less component of alternating current.

Generation of Alternating emf

Consider a rectangular coil of N turns rotating in a uniform magnetic field with an angular velocity ω radian/second about X-axis in its own plain as shown in fig.3.6. Let ф_m be the maximum flux perpendicular to the axis of rotation, when the plain of the coil coincides with the X-axis.