Electrical Insulation Resistance

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The insulation material pass the current flow for direct voltage is called as resistance. It is denoted in terms of ohm. The material insulation is used to separate the conductors with electrical resistance. The electrical insulator resistance is also use the insulation material for high power result. The electrical insulation in resistance is wire or any material.

Explanation for electrical resistance with insulation material

Definition of ohm:

If voltage is 1 volt and flow of current is 1 ampere means the electrical insulation resistance is 1. Thus when we get the electrical resistance of the insulation conductor as 1 ohm resistance, the value of flow current is1 ampere and 1 volt potential difference in conductor.

We can convert the big resistance values into small resistance value that is kilo-ohm, mega ohm are represented as in terms of ten powers and also the small resistance milli ohm, micro ohm is used.

1 kilo-ohm (kΩ) = 103 ohm

1 mega ohm (MΩ) = 106 ohm

1 milli ohm (mΩ) = 10-3 ohm

1 micro ohm (μΩ) = 10-6 ohm

Derived unit and dimensional ...
... formula of resistance:

Resistance, R = Potential difference (V) / Current (I)

Dimensional formula for potential difference, V = [M L2 T-3 A-1]

Dimensional formula for current, I = [A]

Therefore,Dimensional formula for resistance, [R] = [M L2 T-3 A-1] / [A]

= [ M L2 T-3 A-2]

More about electrical resistance

Insulation conductor offers resistance:

In physics, the current flow through insulation conductor offers barrier.The free electrons are collided with positive ions in conductor. So these collisions are basis for electrical resistance.The material, length and cross-sectional area of conductor is basis for electrical resistance of conductor. The insulation conductor should have good atom arrangement. Resistance is inversely related with conductivity and if temperature increase, the electrical resistance also increase.

Insulation Materials and their Uses
Traditional fiberglass, cellulose and and mineral wool are traditional and cheap insulation materials. Modern plastic foams are the other big type of insulation. These few insulation materials are presented in many forms (loose-fill, batts, blanket, sprays...) which have different uses (walls, ceilings, floors...) and different degrees of effectiveness.

Traditional insulation materials
Traditional and inexpensive insulation materials include:
- Cellulose (made from recycled paper)
- Fiberglass (the most common type of insulation, made from molten glass)
- Mineral wool (namely rock wool, made from some molten rocks).

These products come in the form of batts and rolls, or as loose-fill products (rock-wool and cellulose) or spray-applicable materials (cellulose).

See, for more details:
Fiberglass, mineral wool & Home insulation
Cellulose insulation
Synthetics
More recent insulation materials include some highly efficient synthetics, namely rigid insulators as Extruded Polystyrene Foam (XPS), Expanded Polystyrene Foam (EPS or bead board), Polyisocyanurate Foam and, specially, Polyurethane Foam.

Polyurethane Foam is experiencing a growing popularity, due to its effectiveness (polyurethane foam has a R-value of 6.7 to 7 - 1 inch thickness-, approximately the double of common insulating materials).

See, for more details: Spray-on foam insulation

Insulation Materials Forms
Blankets - Batts or Rolls:
Rock wool and fiberglass.

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Loose-Fill (blown-in) or Spray-applied materials:
Rock wool, fiberglass, cellulose, and polyurethane foam...

Rigid Insulators:
Extruded polystyrene foam (XPS)
Expanded polystyrene foam (EPS or bead board)
Polyurethane foam
Polyisocyanurate foam

Reflective Materials:
Foil-faced paper
Foil-faced polyethylene bubbles
Foil-faced plastic film
Foil-faced cardboard
Insulation Materials Forms
Blankets - Batts or Rolls:
Rock wool and fiberglass.

Loose-Fill (blown-in) or Spray-applied materials:
Rock wool, fiberglass, cellulose, and polyurethane foam...

Rigid Insulators:
Extruded polystyrene foam (XPS)
Expanded polystyrene foam (EPS or bead board)
Polyurethane foam
Polyisocyanurate foam

Reflective Materials:
Foil-faced paper
Foil-faced polyethylene bubbles
Foil-faced plastic film
Foil-faced cardboard

Uses of batts or rolls
(Fiberglass and rock wool)
They are suitable for:

- Timber floors;
- Ceilings: flat ceilings (pitched roofs) and cathedral or raked ceilings;
- Suspended slabs.

Their application is often a do-it-yourself work. Batts are mainly used in standard spaces free of obstructions (they should be particularly well fitted between beams and joists).

Uses of Loose-Fill, Spray-applied materials
Rock wool, Fiberglass, Cellulose and Polyurethane foam
These materials are particularly suited for irregular areas and around obstructions, or for adding insulation to existing buildings. They are also a good option to unfinished attic floors.

They are blown into place or applied by spray (they demand special equipment). In the case of walls, they are applied in existing or new cavities.

They are very used in:
- Flat ceilings / Pitched roofs
- Cathedral / Raked ceilings
- Walls

Uses of Rigid Insulation: Foams
Main foams - Extruded polystyrene foam, Expanded polystyrene foam, Polyurethane foam and Polyisocyanurate foam -offer a high insulating performance and are largely used in:

- Flat ceilings / Pitched roof;
- Cathedrals or raked ceilings;
- Timber floors;
- Suspended slabs;
- Slab Edges;
- Brick and Full masonry walls;
- Framed walls;

Uses of radiant barriers
Foil-faced paper, polyethylene bubbles, plastic films and cardboard
Reflective materials (frequently known as radiant barriers and reflective foil laminates or RFL) are in most cases a shiny aluminum foil laminated onto paper or plastic. RFL sheets (sarking), RFL concertina-type and RFL bubble-form are very common. Their goal is to prevent the sun's heat, and are mainly used in hotter climates.

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