The OSG talks about cable passing through thermal insulation and its
effect on cable size.

On the latest project I am going I have to put acoustic insulation in
the stud walls and floors.

Is acoustic insulation regarded as the same as thermal insulation in
this case?

Cheers

Martin
--
Martin Carroll

"Martin Carroll" wrote in message
news
The OSG talks about cable passing through thermal insulation and its
effect on cable size.

On the latest project I am going I have to put acoustic insulation in
the stud walls and floors.

Is acoustic insulation regarded as the same as thermal insulation in
this case?

Cheers

Martin


Personally I'd say yes, because both types of insulation hold still air in a
trap. Therefore, derate the cable by around 1.5 - 2 % per 10 mtr length
within the insulation. If the length through the stud is only a couple of
metres or so, then ignore the derating.

In article , BigWallop
writes

"Martin Carroll" wrote in message
news
The OSG talks about cable passing through thermal insulation and its
effect on cable size.

On the latest project I am going I have to put acoustic insulation in
the stud walls and floors.

Is acoustic insulation regarded as the same as thermal insulation in
this case?

Cheers

Martin


Personally I'd say yes, because both types of insulation hold still air in a
trap. Therefore, derate the cable by around 1.5 - 2 % per 10 mtr length
within the insulation. If the length through the stud is only a couple of
metres or so, then ignore the derating.

Thanks for that.

As regards the length of cable going through the insulation, presumably
I just need to look at the longest run through any insulation not the
total in all parts of the cable.

Cheers

Martin
--
Martin Carroll

"Martin Carroll" wrote in message
...
In article , BigWallop
writes

"Martin Carroll" wrote in message
news
The OSG talks about cable passing through thermal insulation and its
effect on cable size.

On the latest project I am going I have to put acoustic insulation in
the stud walls and floors.

Is acoustic insulation regarded as the same as thermal insulation in
this case?

Cheers

Martin


Personally I'd say yes, because both types of insulation hold still air
in a
trap. Therefore, derate the cable by around 1.5 - 2 % per 10 mtr length
within the insulation. If the length through the stud is only a couple
of
metres or so, then ignore the derating.

Thanks for that.

As regards the length of cable going through the insulation, presumably
I just need to look at the longest run through any insulation not the
total in all parts of the cable.

Cheers

Martin


Yes. If the cable is passing through anything less than 3 mtrs of
insulation, forget the rule. But only if it's one run of up to 3 mtrs of
insulation. Any more insulation on the same run of cable, the whole run of
cable needs to be derated.

An example. If the total cable run is 12 mtrs, of which 2 mtrs are buried
in the insulation. Forget the derating.
If the total run of cable is 15 mtrs, of which 10 mtrs are buried in the
insulation. You have to derate the whole cable run.