Welder Installation

[Festerfly]

I've been asked to install and American TIG welder in a workshop at a site where i do some more normal commercial works.

The Welder requires a 400v Supply (no problem as TP supply nearby) but the current DB is a Hager unit for whichi can only find max MCB's of 63A. this welder requires something closer to 80A per phase.

My thoughts we're can i split the supply feed prior to the DB (or drop extra feeds out the bottom of the DB incomer) and send a second set of feeds into a TP 100A Switch Fuse ? this would then in turn run 25mm 3 core SWA (10 metres max) and down to a another Switched Disconnect located closer to the Welder and then hardwired into this?

or have a missed something vital or even overcomplicating things?

FFYI - the welder is a Miller Syncrowave 351 and the manual can be found here 351 Manual

This needs to be done friday evening after the workshop has closed to minimise downtime.

Cheers in advance!

 

[glynnis]

Am i miss reading the manual or does it say single phase on spec sheet?
See pages 10 and 12?

 

[Festerfly]

All sorted now.


Basically it's a 2 phase welder. It requires two phases (live) at 80A rated and then an earth. The supply board has a maximum Amp of 63A per phase MCB. So it cannot handle the current. The manufacturer suggested either exchanging the welder for an Invertor 3 phase version which runs at a meagre 13a per Line or replace the DB with one which can handle higher loads.

Appreciate the help though.