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whats the differance between systems in the usa than uk #133128 01/17/02 01:13 PM
Joined: Jan 2002
Posts: 7
M
MikeBriggs Offline OP
Junior Member
Im in the UK now and hope to move to the States and be a electrcian, i know the USA use higher current and lower voltage, but what other differances is there i.e earthing systems etc...

all help welcome

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Re: whats the differance between systems in the usa than uk #133129 01/17/02 03:56 PM
Joined: Dec 2001
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Texas_Ranger Offline
Member
Maybe it's worth a look to the non-US electrical systems forum.
Some other differences are for example color codes: hot is black, neutral white or gray, neutral either bare copper (NM or armored cable) or green (appliance cords).

Re: whats the differance between systems in the usa than uk #133130 01/17/02 07:20 PM
Joined: Oct 2000
Posts: 3,960
Bill Addiss Offline
Member
Texas,

Make that last one 'Ground' either bare or Green. (or 'Grounding')

Mike,

That's a big question!
You should take a look at some of the discussions that Pauluk initiated and see if they contain what you are looking for. If you have any specific questions I'm sure that someone will be happy to help you.

Bill


Bill
Re: whats the differance between systems in the usa than uk #133131 01/18/02 09:01 AM
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Texas_Ranger Offline
Member
Ouch! Just left out a part of the text. Shuold have been 'Ground'. Seems I was just too tired when I wrote that.
Sorry to everyone who was confused.

Re: whats the differance between systems in the usa than uk #133132 05/20/02 05:08 PM
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pauluk Offline
Member
Mike,

I've just come across your question while browsing in search of another thread.

Let me know if you're still reading the forum, and I'll try to give you a brief run-down from a British perspective.

Paul.
(In Norfolk).

Re: whats the differance between systems in the usa than uk #133133 05/20/02 05:17 PM
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MikeBriggs Offline OP
Junior Member
Yes i still pass past this forum now and again.

Re: whats the differance between systems in the usa than uk #133134 05/21/02 04:26 PM
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pauluk Offline
Member
O.K., Mike. There are many subtle differences, but I'll try to summarize some of the main points for a starter.

There are the obvious differences that anyone would notice upon stepping off the plane, like the different type sockets and the "upside down" light switches.

You'll find plenty of differences in terminology as well, like ground vs. earth, receptacle vs. socket and so on. You shouldn't have too much trouble adapting to the names, but there are one or two terms that might catch you out if you aren't paying attention closely enough. For example, be careful not to confuse a grounding conductor (an earth, or CPC if you prefer) and a grounded conductor (a neutral).

Cable sizes are measured using AWG (American Wire Gauge). It works in a similar way to the old British SWG in that the larger the number the smaller the wire, although there's no direct correlation between AWG and SWG. #14 is a common one for many domestic circuits, and is the nearest equivalent to our 2.5 sq mm.
And as I'm sure you will have noticed from other posts, the color (colour?) codes are somewhat different.

You mentioned the lower voltage/higher currents. Although 120V is the standard for domestic lights, portable appliances, etc., I've found that many people in this country don't realize that the majority of U.S. homes do actually have 240V available as well.

Whereas most homes in the U.K. are tapped 2-wires from a 3-ph network, the majority of U.S. homes are fed from a single-phase xfmr with a center-tapped secondary using a 3-wire system. A double-pole breaker is used to provide a 240V circuit to large appliances, such as a range (cooker), clothes dryer, central A/C unit, etc.

Domestic circuit arrangements use a dedicated branch circuit for each major appliance, including some 120V appliances such as a washing machine, dishwasher, and so on.

Homes will also normally have at least two "small appliance" circuits (120V 20A) feeding the kitchen/dining area receptacles. Other receptacles in the house and lights are fed on general-purpose 15 or 20A circuits based on a specified wattage per square foot.

Note that they don't use rings, and that on the general circuits lights and wall sockets can be mixed.

There are more recent requirements, such as provision of a 20A bathroom circuit to allow for hairdryers. (Contrast this with our Regs. which prohibit the installation of such an outlet!)

The main house earth is always bonded to the neutral at the main panel, so their earthing system most closely resembles our PME arrangement (TN-C-S in modern parlance), although there are differences.

When it comes to commercial/industrial, America has a greater variety of supply systems than we do. 3-phase is supplied at 120/208V Wye and 277/480V Wye, but they use delta systems as well, including an unusual (from our point of view) unbalanced delta.

The NEC (National Electrical Code) is the nearest equivalent to the IEE Wiring Regs., and is updated every 3 years. The other guys on here are much better qualified than I am to go into the intricacies of the NEC, however!

That's just a brief start to the differences, but probably enough for one message.


[This message has been edited by pauluk (edited 05-21-2002).]


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