Hospital Isolated Power Homerun?

[MEP_PM]

Is there a limit to the number of circuits that can be in a single conduit (Beyond standard installation requirements)? Will 2-3 circuits per homerun affect the isolation panel / ground testing? Should each circuit have a dedicated homerun? My questions are based on a situation where a headwall is served by multiple isolated power circuits; can these be combined without having future problem when the system is tested?

Any information would be appreciated.

 

[roger]

If the runs are less than 60'-70' (shorter would be better) there will probably be no problem.

I have had leakage problems combining circuits in longer runs though.

The ground testing will not be affected by this.

Roger

 

[glene77is]

I served a university hospital many years back.
The JACH had leakage test standards.
The 100 micro amp test was common on PM.
I tested for 10 micro amp sometimes
on equipment connected intravenously.
There was a single Isolation Transformer,
feeding a single panel, for ICU.
All circuits left in shared conduit.
With short runs (50') there was no leakage via insulation.
There were never any ground leakage problem.

What was amazing is just how little stray current is required
to trigger some weak patient's heart,
when the equipment is connected intravenously.