Nick,
Regarding your item 1, the receptacles ratings can vary depending upon
the branch circuit (in the building) rating. The U.S. National
Electrical Code (210-21(b) supplies tables for receptacle ratings for
various size circuits, as well as the maximum load (cord & plug) that
can be connected to such receptacles. I have combined information
from two tables in the NEC, as follows:
Cord & Plug
Circuit Rating Receptacle Rating Maximum Load
Amps Amps Amps
15 Not over 15 12
20 15 12
20 20 16
30 30 24
40 40 or 50 --*
50 50 --*
* These would be industrial
type plugs and not detachable
cord sets.
Other things you might need to consider:
1. A single receptacle installed on an individual branch circuit is
required to have an ampere rating of not less than that of the
branch circuit. For example, a single receptacle on a 20-ampere
branch circuit must be rated at 20 amps; however two or more 15-ampere
receptacles are permitted on a 20-ampere general-purpose branch
circuit.
Another way of putting it, your anticipated load should not exceed 80%
of the receptacle rating.
Regarding your item 2, the NEC specifies various permissible loads and
branch circuit ratings in volt-amperes, and I do not have building
construction experience to tell you what is "typical". However, the
typical nominal supply voltage in the U.S. is 120; 120/240; 240, and
208Y/120 volts. My electrical dryer is rated at 240 volts and is
connected via a heavy duty industrial type plug (I need to go home and
check the receptacle rating!) Hope someone else can provide you with more
information.
Tania Grant, Lucent Technologies, Octel Messaging Division
[email protected]
______________________________ Reply Separator _________________________________
Subject: BOUNCE [email protected]: Non-member submission from ["N
Author: [email protected] at P_Internet_Mail
List-Post: [email protected]
Date: 12/17/97 11:50 AM
From: "Nick Evans" <[email protected]>
Subject: US supply Voltage questions
I wonder if anyone can help me with a couple of practical questions concerning
USA supply voltages.
1. Does anyone know what the normal maximum current rating is on a 110V
supply for a domestic socket outlet.
2. Are there any situations (for example in commercial installations) where a
single phase supply of greater than 110V can (would normally be supplied)? If
so what would be the normal maximum current supply for this increased voltage.
Thanks a lot for any assistance.
Best regards
Nick Evans
Managing Director
Genesys IBS Ltd
Worldwide Product Compliance & Localisation
Tel: +44 1600 710300
Fax: +44 1600 710301
Mobile: +44 385 367348 (GSM)
E-mail: [email protected] (data transfer limit: 2Mb)
Web: Http://www.gentel.co.uk/genesys
Received: from curly.eng.octel.com (148.147.200.26) by m-internet.corp.octel.com
with SMTP
(IMA Internet Exchange 2.1 Enterprise) id 0032DE28; Wed, 17 Dec 97 08:59:22
-0800
Received: from gw3.octel.com (gw3.octel.com [148.147.1.15]) by
curly.eng.octel.com (8.6.12/8.6.12) with ESMTP id JAA28004; Wed, 17 Dec 1997
09:00:49 -0800
Received: (from daemon@localhost) by gw3.octel.com (8.6.10/8.6.12) id JAA11693;
Wed, 17 Dec 1997 09:00:19 -0800
Received: from europe.std.com(199.172.62.20) by gw3.octel.com via smap (V1.3)
id sma011134; Wed Dec 17 08:59:09 1997
Received: by europe.std.com (8.7.6/BZS-8-1.0)
id LAA24528; Wed, 17 Dec 1997 11:50:33 -0500 (EST)
Received: from world.std.com by europe.std.com (8.7.6/BZS-8-1.0)
id LAA24523; Wed, 17 Dec 1997 11:50:30 -0500 (EST)
Received: from localhost by world.std.com (5.65c/Spike-2.0)
id AA11733; Wed, 17 Dec 1997 11:50:30 -0500
List-Post: [email protected]
Date: Wed, 17 Dec 1997 11:50:30 -0500 (EST)
From: Jon D Curtis <[email protected]>
To: [email protected]
Subject: BOUNCE [email protected]: Non-member submission from ["Nick Evans"
<[email protected]>] (fwd)
Message-Id: <[email protected]>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: [email protected]
Precedence: list
Reply-To: [email protected]
