RE: LSOH v PVC [Hevacomp Forum]

Question

Duncan

many thanks for the prompt response.

I've read that section but unfortunately it still doesn't answer my query and it may well be that i'm not understanding what the Hevacomp takes into account with an LSF cable versus a PVC cable, but perhaps if I explain an example as follows

if I have a 25A MCB protecting a 2.5mm LSF single cable installed in trunking / conduit, then that cable is capable of carrying 31A (90deg thermosetting insulation)

if I have a 25A MCB protection a 2.5mm PVC cable installed in trunking / conduit, then that cable is capable of carrying 24A (70deg PVC insulation), therefore non-compliant

so the LSF cable has (for the same copper conductor) has a better current carrying capacity due to the temperature rating of it's insulation.

if the LSF cable is sourced from and/or connected to a protective device and/or accessories which does not share that enhanced operating temperature, how can we then benefit from that cable

Regards,

Tony

Tony Hutchison

Electrical Engineer

City Development - Design & Property Division

Floors 5/6 Dundee House

50 North Lindsay Street

Dundee DD1 1LS

Tel, 01382 433264

e-mail: tony.hutchison@dundeecity.gov.uk

-----"Duncan Brown" <bounce-83D79C23-3DDB-497D-B2E2-B5CB87B1BC6C@communities.bentley.com> wrote: -----

To: <HevacompForum@communities.bentley.com>
From: "Duncan Brown" <bounce-83D79C23-3DDB-497D-B2E2-B5CB87B1BC6C@communities.bentley.com>
Date: 19/07/2017 09:05AM
Subject: RE: LSOH v PVC [Hevacomp Forum]

Message from Bentley Communities

Duncan Brown

Hi Tony - The software doesn't force you to do anything. if the cable fails the checks you will get a report of the failures. It would be up to yourself to decide whether to use a different cable.

I would strongly recommend considering section 4.6 in the manual for details on how operting temperature are implemented. This is quite a detailed section and should be of help.

The manual can be accessed by running the Connect program, clicking on the file menu and selecting "manual" - the section that should interest you would be "17th Edition Calculations"

Regards,

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