Incoming device as Disconnector Switch / Isolator

[NickParker]

See the picture below, Can the incoming device be a disconnector switch or a circuit breaker?
I am looking for both IEC and NEC codes that permit the use of disconnector switches as incomers.

 

[waross]

The device must be rated for the application.
For instance, if the example is ruled a service entrance by the AHJ then the device must be "Service Entrance"rated.

You may have an instance where the upper device on the transformer secondary must be "Service Entrance" rated, but the lower device need not be.
If the device may be opened under load, then the device, whatever is used, must have an adequate ASSC rating, as well as adequate voltage and current ratings.

 

[jghrist]

| don't think it is either an IEC or ANSI symbol. Looks more like a horn gap switch symbol, but that would not provide the protection needed.

 

[crshears]

Why are the reply dates on this post getting earlier and earlier in time?

 

[crshears]

And I'm posting this on 3 December 2024, not 23 March 2013 . . .

 

[jghrist]

I think the Mar 23, 2013 date is when you set up your Eng-tips account.

 

[stevenal]

Shows as Mar 22 on my screen.

The posts all show time of day in my time zone, yesterday and today in sequence.

 

[waross]

"Look up, way up"
The time elapsed since a reply was posted is given on the left end of the blue line immediately above the reply.
I am seeing this:
"Today at 10:07 AM"
for the post above this reply.

 

[Padlock01]

The switch disconnector on the MCC will not discriminate between the outgoing MCCBs if the outgoing MCCB's protection is not set properly
then you will trip the MCCB / ACB feeder on the Main LV switchboard.