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biswasji
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Join Date: Aug 2012
Posts: 10

Design LT Panel Switch Rating

09/16/2012 2:11 PM

how to decide incoming & out going switch rating in LT panel. How to select where to use switch fuse unit & fuse switch unit.
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lyn
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Join Date: Oct 2008
Posts: 42355
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#1

Re: design LT panel switch rating

09/16/2012 2:15 PM

It's usually in the text book.SECTION V ELECTRICAL SPECIFICATION
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
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#2

Re: design LT panel switch rating

09/16/2012 3:23 PM

Find ISxxxx that is counterpart to BS7671 or the U.S. NEC; it should tell you the acceptable options.

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Crabtree
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Location: Commissariat de Police, Nouvions, occupied France, 1942.
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#3

Re: design LT panel switch rating

09/16/2012 4:10 PM

It rather depends upon the cable sizing, and what's upstream and downstream of it, Mildred.

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kvsridhar
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#4

Re: design LT panel switch rating

09/16/2012 5:43 PM

What, in your opinion, is the difference between the two (SwitchFuse and FuseSwitch)?

If you glance at IEC 60947-3 you will see that the two terms are no longer in use. The correct term for both is Fuse-combination-unit.

So, your question is redundant. It is the same equipment both at Incoming and outgoing, only the ratings will be different obviously.

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electricalexpert65
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Join Date: Oct 2009
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#5

Re: Design LT Panel Switch Rating

09/17/2012 9:20 AM

Both SFU & FSU have become almost obsolete now. Today, the most popular is the SDF Unit or the Switch Disconnector Fuse Unit.
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Crabtree (1); electricalexpert65 (1); kvsridhar (1); lyn (1); Tornado (1)

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