Rick,
We were developing the power supply for the Lexmark MarkNet Pro External Print
Servers. The power supply has a "Y-cable" with:
* A shrouded male IEC-320 sheet C14 connector on one end.
* A female IEC-320 sheet C13 plug.
* Soldered connections to the power supply card in the middle.
This was to be a cost reduction from the scheme we used on the Lexmark MarkNet
XLe, where we used an IEC-320 appliance inlet/outlet on the power supply card
with a jumper cable having IEC-320 C14 and IEC-320 C13 connectors. In both
cases the power supplies had worldwide approvals (UL, CSA, TUV, SAA, MITI, and
various Nordic approvals) and the idea was to "steal" a printer's linecord to
make connection to the wall outlet. This way each model only had one top
bill-of-material for worldwide use, versus over nine top bills-of-material per
model for the IBM 4033 where we shipped separate linecords for:
* US/Canada (NEMA WD-1 5-15P plug).
* Australia/New Zealand (AS 3112 plug).
* Continental Europe (CEE 7 VII, or "Schuko" plug).
* Denmark (Afsnit 107 plug).
* Africa (GG 164 plug).
* United Kingdom (BS 1363 plug).
* Switzerland (1011-S24507 plug).
* Italy (CEI 23-16 plug).
* Israel (SI 32 plug).
To the safety agencies, we now had a weird hybrid of a regular power supply and
an extension cord to the printer. Our original intent was to rate the auxiliary
output at just under 12A for 100-120VAC and just under 10A for 220-240VAC, by
using:
* 13A cordage.
* IEC-320 connectors rated for 15A by UL and CSA, and for 10A by other
(220-240VAC country) safety agencies.
With UL's interpretation of "attachment plug" as including the cordage, we
needed to find >= 15A cordage or back off our input-current rating to under
10.4A. We wound up doing the latter because we could not find cordage that:
* Had UL, CSA, and Harmonized approvals.
* Was rated >= 15A by UL and CSA.
* Was rated >= 10A by other safety agencies.
AND
* Would fit into IEC-320 sheet C13 and C14 connectors that had all these
ratings/approvals.
John Barnes Advisory Engineer
Lexmark International
-------------------------------------------
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
To cancel your subscription, send mail to:
[email protected]
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Jim Bacher: [email protected]
Michael Garretson: [email protected]
For policy questions, send mail to:
Richard Nute: [email protected]
