Miller Electric Spectrum 1250, Owner'S Manual

Page: 35 / 48

OM-217 Page 31
7-3. Correct Installation
A. Worksite Requirements
1 Plasma Arc Cutting Source
Ground metal machine case, line disconnect
device, input supply, and workpiece (if
required).
2 Center Point Of Cutting Zone
Midpoint between high-frequency source
and cutting torch.
3 Cutting Zone
A circle 50 ft (15 m) from center point in all
directions.
4 Torch And Work Cables
Keep cables close together.
5 Conduit Joint Bonding And Grounding
Electrically join (bond) all conduit sections
using copper straps or braided wire. Ground
conduit every 50 ft (15 m).
6 Water Pipes And Fixtures
Ground water pipes every 50 ft (15 m).
7 External Power Or Telephone Lines
Locate high-frequency source at least 50 ft
(15 m) away from power and phone lines.
8 Grounding Rod
Consult the National Electrical Code for
specifications.
Metal Building Requirements
9 Metal Building Panel Bonding Methods
Bolt or weld building panels together, install
copper straps or braided wire across seams,
and ground frame.
10 Windows And Doorways
Cover all windows and doorways with
grounded copper screen of not more than
1/4 in (6.4 mm) mesh.
11 Overhead Door Track
Ground the track.
Ref. S-0755
1
2
3
50 ft
(15 m)
4
7
50 ft
(15 m)
8
8
5
6
Ground
Workpiece
If Required
By Codes
Ground All
Metal Objects
And All Wiring
In Cutting Zone
Using #12 AWG
Wire
Cutting Zone
Nonmetal Building
9
8
11
10
Metal Building
8