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elect-ok
Power-User

Join Date: Sep 2008
Location: Jakarta, Indonesia
Posts: 104

Earthing Switch Symbol

11/03/2008 5:31 AM

could any body send me earthing switch symbol of MV SWGR of NEMA standart.

because i all of my time as electrical engineer only design with IEC standart.

thank you
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#1

Re: earthing switch

11/03/2008 11:33 AM

There is no equivalent to an IEC "Earthing Switch" in NEMA gear. We do not do that with a separate switch. In Air Break Load Interrupter Switches, there is a grounding bar that the switch makes contact with in the Open position, but there is no specific symbol for it, we just show a ground symbol on the open switch symbol.

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elect-ok
Power-User

Join Date: Sep 2008
Location: Jakarta, Indonesia
Posts: 104
#2
In reply to #1

Re: earthing switch

11/06/2008 7:58 PM

Why in NEMA schematics symbol, if we want to show CB, for example 4.16 KV VCB for incoming, we just show 52 symbol ?.

why in that schematics diagram, doesnt show earthing switch that interlock with VCB ?

thank you
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