3-phase: how to tell amperage/voltage?
 

Hi,

After an 8-month-long search, I may finally have found a space
on campus for a forge.

For my forge I want a hydraulic press, which = power hungry

The room is shared by a bridgeport mill, a lathe, and a metal
bandsaw, which I'm told run on 3-phase.

I'm new to this. I know that with standard household power, all
outlets are 15amp, unless one contact is turned 90 degrees, and then
you know it's 20amps.

I'll visit the shop again tomorrow or tuesday and examine it
more closely. How do I tell the voltage and amperage of this 3-phase
circuit, so I know how much I can load onto it? The press would
benefit from a 5-10 hp motor, so I need to know if it could handle that
power. How do I find out; are there specific plug types to recognize--
if you even use plugs?



thanks!
-Bernard Arnest

3-phase: how to tell amperage/voltage?
 

A three phase plug is usually a twist plug with 4 prongs.

Also look at the motor data plates on the machine tools. They will tell you
the voltage and if it is single or 3 phase.

Also if it is on campus they probably have an electrician on staff and you
could ask him. You might need a dedicated circuit.

--
Roger Shoaf

If knowledge is power, and power corrupts, what does this say about the
Congress?
"Bernard Arnest" wrote in message
oups.com...
Hi,

After an 8-month-long search, I may finally have found a space
on campus for a forge.

For my forge I want a hydraulic press, which = power hungry

The room is shared by a bridgeport mill, a lathe, and a metal
bandsaw, which I'm told run on 3-phase.

I'm new to this. I know that with standard household power, all
outlets are 15amp, unless one contact is turned 90 degrees, and then
you know it's 20amps.

I'll visit the shop again tomorrow or tuesday and examine it
more closely. How do I tell the voltage and amperage of this 3-phase
circuit, so I know how much I can load onto it? The press would
benefit from a 5-10 hp motor, so I need to know if it could handle that
power. How do I find out; are there specific plug types to recognize--
if you even use plugs?



thanks!
-Bernard Arnest

3-phase: how to tell amperage/voltage?
 

First of all you really need an electrician to look at the room wiring.
I don't want to apear insulting but if you don't know about electrics,
get a professional in.
Do the other room users know you want to put a forge in there? The
forges I've seen (which is relatively few) make lots of nasty black
dust which lathes etc don't like.

3-phase: how to tell amperage/voltage?
 

You really can't tell much from the plugs in the room, there is enough
variation that is will be misleading. This variation is a function of
both local intereptations of NEC as well as conventions used by that
building.

For a very ROUGH approximation, Bridgeports typicaly come with 2 hp 3
phase motors, ditto for a 15" lathe (less and single for smaller 10"
lathe) and 1 hp for a bandsaw (single or 3 phase. This collection of
machines totals around 5 hp of load. Room wiring could be anything
larger than that. Ask the facilities people to meet you in the room,
they can tell you in a couple of minutes what is possible. Be prepared
to need a rewiring job to run a new wire from a convient breaker panel
to your location through (hopefully) an existing conduit. On campus,
this will likely cost as much as the machine you plan to hook up. :(

Your press will not be a welcome neighbor to the machine tools. The dirt
will bother the machines, the noise will bother the users.


Bernard Arnest wrote:
Hi,

After an 8-month-long search, I may finally have found a space
on campus for a forge.

For my forge I want a hydraulic press, which = power hungry

The room is shared by a bridgeport mill, a lathe, and a metal
bandsaw, which I'm told run on 3-phase.

I'm new to this. I know that with standard household power, all
outlets are 15amp, unless one contact is turned 90 degrees, and then
you know it's 20amps.

I'll visit the shop again tomorrow or tuesday and examine it
more closely. How do I tell the voltage and amperage of this 3-phase
circuit, so I know how much I can load onto it? The press would
benefit from a 5-10 hp motor, so I need to know if it could handle that
power. How do I find out; are there specific plug types to recognize--
if you even use plugs?



thanks!
-Bernard Arnest

3-phase: how to tell amperage/voltage?
 

RoyJ wrote:
You really can't tell much from the plugs in the room, there is enough
variation that is will be misleading. This variation is a function of
both local intereptations of NEC as well as conventions used by that
building.

For a very ROUGH approximation, Bridgeports typicaly come with 2 hp 3
phase motors, ditto for a 15" lathe (less and single for smaller 10"
lathe) and 1 hp for a bandsaw (single or 3 phase. This collection of
machines totals around 5 hp of load. Room wiring could be anything
larger than that. Ask the facilities people to meet you in the room,
they can tell you in a couple of minutes what is possible. Be prepared
to need a rewiring job to run a new wire from a convient breaker panel
to your location through (hopefully) an existing conduit. On campus,
this will likely cost as much as the machine you plan to hook up. :(

Your press will not be a welcome neighbor to the machine tools. The dirt
will bother the machines, the noise will bother the users.


Bernard Arnest wrote:
Hi,

After an 8-month-long search, I may finally have found a space
on campus for a forge.

For my forge I want a hydraulic press, which = power hungry

The room is shared by a bridgeport mill, a lathe, and a metal
bandsaw, which I'm told run on 3-phase.

I'm new to this. I know that with standard household power, all
outlets are 15amp, unless one contact is turned 90 degrees, and then
you know it's 20amps.

I'll visit the shop again tomorrow or tuesday and examine it
more closely. How do I tell the voltage and amperage of this 3-phase
circuit, so I know how much I can load onto it? The press would
benefit from a 5-10 hp motor, so I need to know if it could handle that
power. How do I find out; are there specific plug types to recognize--
if you even use plugs?



thanks!
-Bernard Arnest


Your press will not be a welcome neighbor to the machine tools. The
dirt
will bother the machines, the noise will bother the users.

Most small hydraulic pumps are not much different from small mills or
lathes when it comes to noise. An air hammer now would be a different
story. Perhaps you meant a coal forge was dirtier? You could always
use a gas fired forge which, again, is not all that objectionable.

dennis
in nca

3-phase: how to tell amperage/voltage?
 

thanks for the help! I emailed facilities this morning, and await
their response.


thanks again,
-Bernard

3-phase: how to tell amperage/voltage?
 

Machines like that and yours don't plug into the wall. They get wired
directly into the power panel or into a power switch box that then goes
to the panel.

By all means contact facilities before they put you into the forge!!!

Martin

Martin Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH & Endowment Member
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member


Bernard Arnest wrote:
Hi,

After an 8-month-long search, I may finally have found a space
on campus for a forge.

For my forge I want a hydraulic press, which = power hungry

The room is shared by a bridgeport mill, a lathe, and a metal
bandsaw, which I'm told run on 3-phase.

I'm new to this. I know that with standard household power, all
outlets are 15amp, unless one contact is turned 90 degrees, and then
you know it's 20amps.

I'll visit the shop again tomorrow or tuesday and examine it
more closely. How do I tell the voltage and amperage of this 3-phase
circuit, so I know how much I can load onto it? The press would
benefit from a 5-10 hp motor, so I need to know if it could handle that
power. How do I find out; are there specific plug types to recognize--
if you even use plugs?



thanks!
-Bernard Arnest


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3-phase: how to tell amperage/voltage?
 

Bernard Arnest wrote:
Hi,

After an 8-month-long search, I may finally have found a space
on campus for a forge.

For my forge I want a hydraulic press, which = power hungry

The room is shared by a bridgeport mill, a lathe, and a metal
bandsaw, which I'm told run on 3-phase.

I'm new to this. I know that with standard household power, all
outlets are 15amp, unless one contact is turned 90 degrees, and then
you know it's 20amps.

I'll visit the shop again tomorrow or tuesday and examine it
more closely. How do I tell the voltage and amperage of this 3-phase
circuit, so I know how much I can load onto it? The press would
benefit from a 5-10 hp motor, so I need to know if it could handle that
power. How do I find out; are there specific plug types to recognize--
if you even use plugs?
If you want to know the amperage of existing circuits, find the curcuit
breaker and read the label on the handle. If they have the place wired
for plug-ins, then unplug the machine and read the voltage and current
rating that is molded into the outlet.

If you want to know the remaining available capacity in that room,
that is a lot harder, and for the most part will require a visit from
the local electrician. There may be spare breakers installed in the
panel that don't go anywhere, so adding up the existing breakers could
give you the impression it is all used up already, when there is still
capacity left over.

Jon