Quattro output RCCD / GFCI protection always needed?

DIY
, , , , ,
1

Hi!

The manual for 120V Quattro says, at the top of page 12, a “UL 943 compliant residual current circuit breaker (RCCD) and fuse or circuit breaker rated to support the expected load must be included in series with the output.”

Is this really always needed? Why?

Does this requirement have to do with marine applications?

We are planning to use 120V Quattros in the USA as a UPS for a few buildings, including a home and a commercial building. In the home, we may use two Quattros in a “split phase” configuration, and the commercial building will be three-phase, with multiple Quattros in parallel on each phase.

These will be stationary systems in buildings that are compliant with the US electrical code. There are GFCI breakers on various load circuits as needed.

100A or larger GFCI breakers appear to be relatively exotic and expensive in the US. A special purpose device may cost more than a Quattro. I am having trouble understanding why this requirement exists.

Thank you

Brian

2

I have no idea why that is in the manual either, other than for Marine applications, as you point out.
None of my house systems have GFCI/RCCD on the output.

I do have main breaker panels with individual GFCI circuits, as well as GFCI outlets where required by code.

3

Thank you Rick. It sounds like it is probably safe to ignore this requirement.

Is there any reason why it would be a problem?

4

For professional installation compliant with local codes, then this requirement can be ignored.
RCCD’s should be used on circuits where accidental contact with a live wire is a possibility, like service power outlets (wall sockets or GPO’s). Lighting circuits don’t usually fall into this category.
For non professional installations, a GFI would be mandatory in the manual, so the supplier is covered.

5

Thank you very much for the responses.