×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

small XMFR

small XMFR

small XMFR

(OP)
I want 240 L-N

Can i Ground X4 tie x2 and x3 togather and use X1

wire to the device would be x4=N and x1=L

240V L-N


should work but the connection diagram is not showing it



This is your life and its ending one moment at a time.

RE: small XMFR

Whichever side you ground, X1 or X4 becomes your neutral. You can ground in the middle as well. The only thing that changes is terminology, X1-X4 becomes L-L instead of L-N. If you do ground the center tap you can use 120V rated insulation which. I don't think this will save any cost.

RE: small XMFR

AppleJaxJap, you appear to have committed what I consider to be a common sin among engineers and technicians: only looking at the graphics and not reading the text. The table to the right of the diagram tells you exactly what to connect for each side depending on the voltages, so the simple answer to your question is yes.

xnuke
"Live and act within the limit of your knowledge and keep expanding it to the limit of your life." Ayn Rand, Atlas Shrugged.
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: small XMFR

Xnuke,
But the unanswered question is: can he ground X1 (or X4)? This isn't addressed in the text. Normally, the voltage to ground of a 240 volt wire is 120 volts because it is part of a 120/240 volt circuit with the canter point (X2-X3) grounded. NESC 250.20(B) requires a system to be grounded if the system can be grounded so that the maximum voltage to ground on the ungrounded conductors does not exceed 150 V. It's not clear to me if grounding X1 or X4 is prohibited when there is no conductor connected to X2-X3. I don't think it would be prohibited for a 2-wire circuit. Consider, though, that in a 240 V delta system with one winding mid-point grounded, there is a 208 V to ground high leg that is required to be identified by an orange color by Rule 110.15.

RE: small XMFR

Quote (jghrist)

NESC 250.20(B) requires a system to be grounded if the system can be grounded so that the maximum voltage to ground on the ungrounded conductors does not exceed 150 V.
Very similar wording in the Canadian code. (Under 150 Volts to ground must be grounded.)
Consider 277/480 Volt lighting panels or in Canada, 347/600 Volt lighting panels.
You have one end of 277 Volt circuits grounded.
You need not ground one end of your circuit but you may if you wish.
I would ground X1.
If you do not ground the circuit the Canadian code requires ground detection equipment.

Quote (Canadian Code)

(2) Wiring systems supplied by an ungrounded supply shall be equipped with a suitable ground fault detection
device to indicate the presence of a ground fault.
(3) Ground fault indication activated by the ground fault detection device required by Subrule (2) shall be
clearly
(a) labelled as to its purpose; and
(b) visible to persons monitoring the status of the system.
A jumper to ground is so much cheaper and easier.

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close