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Answered 2009-05-21 18:45:25

Gosh, I couldn't say...but, if you're asking because you're trying to choose which one to use I have to say DONT use polystyrene..not in the loft anyway! In the loft, the beads will attach themselves to your wiring, over time, and eat their way through them. And are a fire hazard. BUT, if it's for in your walls, I believe polybeads have a higher u-value thus insulate better. Rockwool is a very good product though, been around for decades, is inert and also used in hospitals (internal walls) to stop the spread of fire.

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Does a high rating mean lots of insulation or little insulation?

It depends what you mean by a 'high rating'!If you mean a high 'voltage rating' then, yes, you will require thicker insulation. But if you mean a high 'power rating', then, not necessarily, because the voltage can be low, while the current is high.Remember, the thickness of insulation depends on the voltage, while the type of insulation (how it withstands higher temperatures) depends on the current.

What is The amperage rating of 350 MCM copper wire?

It depends on a lot of factors. Generally speaking, if the insulation is THHN then the rating is 350 amps. If the insulation is THWN then the rating is 310 amps. The ampere rating for wire depends on the temperature of the environment it will be used in, the insulation rating and the number of circuits installed in a conduit. There are also other factors to consider... like voltage drop in long runs.

An R-value is a rating for materials used as?


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You can use an insulation rating 5000 volt to run 4160 volt supply.

How good is an insulation rating of R33?

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What is the meaning of XLPE insulation?

It is the chemical components that make up the insulation on some types of wire. Cross-Linked Polyethylene Insulation (XLPE), High Heat Resistant, 90ºC Rating, Wet and Dry Locations.

What type of conductor should be used for wiring on fixture?

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What is the difference by v-75 PVC sheathed insulation and v-90 v-75 PVC sheathed insulation?

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How many amps will 6 gauge wire carry?

A #6 AWG copper wire with 60 degree Celsius insulation rating can carry 55 amps, 75 degree Celsius insulation rating can carry 65 amps, and a 90 degree Celsius insulation rating can carry 75 amps. If it is aluminum or copper-clad aluminum the ampacity for the three temperature ratings would be 40, 50, and 60 respectively.

How many amps is a 3 gauge copper wire rated for at 115 volts?

A #3 copper wire with an insulation rating of 90 degree C has the capacity to receive 105 amps. This is the most common or standard insulation that most calculations are based on. It is the insulation that governs the rating of the voltage. House wiring cables are insulation rated at 300 volts. Most other wiring insulation is rated at 600 volts. Special wires have a insulation factor of 1000 volts. The higher the insulation temperature factor is the higher the rating of current through the wire becomes. #3 at 60C is 55 amps, at 75C 65 amps, at 90C 105 amps, at 110C 120 amps, at 125C 130 amps, and at 200C 145 amps.

What is amp rating 12 gauge wire?

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What is the amp rating on 12 gauge wire?

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Will ten gauge wire will allow more current flow than fourteen gauge wire?

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