Steve,

Thanks.  I see that now that look more closely at the standard.

Regards,

Phil

-----Original Message-----
From: Steve Smith [mailto:[log in to unmask]]
Sent: Thursday, July 15, 2010 9:30 AM
To: TechNet E-Mail Forum; Phil Nutting
Subject: RE: [TN] System schematic markings of assemblies

I believe IEEE 315 (was ANSI Y32.2) is the standard you are looking for.
Assemblies and sub-assemblies are both listed as "A".  When I rarely
have to mark sub-assemblies within an assemblies I use A1A1, A1A2, etc.

My regards,
Steve Smith

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Thursday, July 15, 2010 8:52 AM
To: [log in to unmask]
Subject: [TN] System schematic markings of assemblies

Good morning,

I'm looking for a standard for marking assemblies in a system schematic
or block diagram.

Typically assemblies will be A1, A2, etc., connectors will be J1, J2 or
P1, P2, transformers will be T1, T2.

So what is the standard for a PCB (PWA) within an assembly?  Does it
become A1A1, A1B1 or something else?

Having a standard to work to (I'll assume this would be an ANSI
standard) would be helpful.

Thanks in advance.

Phil Nutting

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