Miller Electric HF-251-2, HF-251D-1 manual Correct Installation, Metal Building Requirements

7-3. Correct Installation

	Weld Zone	7
3	50 ft
	(15 m)	50 ft
		(15 m)
		5

6

8

1

2

8

4

Ground all metal ob- jects and all wiring in welding zone using #12 AWG wire.

Nonmetal

Building

Ground workpiece if required by codes.

9

1High-Frequency Source (welding power source with built-in HF or separate HF unit)

Ground metal machine case, work output terminal, line disconnect device, input supply, and worktable.

2 Center Point of Welding Zone

Midpoint between high-frequency source and welding torch.

3 Welding Zone

A circle 50 ft (15 m) from center point in all directions.

4 Weld Output Cables

Keep cables short and close together.

Metal Building

8

11	8
10
	Ref. S-0695 / Ref. S-0695
5 Conduit Joint Bonding and Grounding	Metal Building Requirements
Electrically join (bond) all conduit sections	9 Metal Building Panel Bonding
using copper straps or braided wire.	Methods
Ground conduit every 50 ft (15 m).	Bolt or weld building panels together, install
6 Water Pipes and Fixtures	copper straps or braided wire across
	seams, and ground frame.

Ground water pipes every 50 ft (15 m).

10 Windows and Doorways

7	External Power or Telephone Lines	Cover all windows and doorways with
Locate high-frequency source at least 50 ft		grounded copper screen of not more than
(15 m) away from power and phone lines.		1/4 in (6.4 mm) mesh.
8	Grounding Rod	11 Overhead Door Track

Consult the National Electrical Code for	Ground the track.
specifications.

Return To Table Of Contents OM-611 Page 23