Help, please. I have another of those is it Code or what. I seem to remember there is a maximum number of receptacles that can be downstream fed by a single GFI. Just can't remember if it was in the installation paperwork or the NEC. I have gone blind looking for it in the NEC. Thanks.
Even though it is not a code requirement, I feel multiple receptacles off of one GFCI is a bad design. Especially when fed to different rooms or locations at an occupancy. There is nothing worse than loosing power at several locations from one nuisance trip. I only feed additional receptacles off of a single GFCI device that are in the immediate vicinity and limit it to two additional receptacles at most. Just my opinion.
Bryan P. Holland, ECO. Secretary - IAEI Florida Chapter
Re: Number of GFI's on ckt#84744 05/01/0308:59 AM05/01/0308:59 AM
Some GFI manufacturer's installation instruction have a listed number of receptacles that can be feed from one GFI. I remember 6 on a 15A ckt. It been a while since I read thru those instructions. Except for bathrooms, any feed thru recepticles, that I install, are in sight of the GFI. JMHO.
Re: Number of GFI's on ckt#84745 05/01/0310:31 AM05/01/0310:31 AM
There is in fact a limit on the number of appliances you can connect. Unfortunately, it varies from time to time. The background is that a GFCI is extremely sensitive, tripping at a unbalance of just 5mA. Each appliance, or at least those with a equipment ground, "leak" from hot to ground. For example, computers leak about a milliamp on 240V. (I don't know how much it leaks on 120V.) I would not be surprised if some GFCI manufacturers for this reason cite a maximum number of receptacles to bed fed from a single GFCI.
Re: Number of GFI's on ckt#84747 05/01/0308:25 PM05/01/0308:25 PM
For what it's worth... Spoke to a few "engineers" at a mfg about a similar situation. First comment was "180 va each" Second comment was "6 on a 15"; "8 on a 20". Third was "read the enclosed literature".
I wasn't thrilled at any of the above answers and handed the instructions to the guy who asked the question. Personally, we keep it "in sight" and no more than two downstream duplexes. John
Re: Number of GFI's on ckt#84748 05/01/0309:11 PM05/01/0309:11 PM
I've seen tract houses where a single GFI was installed and used to protect receptacles in the bathrooms and the front and back exterior outlets! With maybe 80 feet of cable on the load side of the GFI, with some over-driven plain steel cable staples, the GFI started to nuisance trip as it aged. Even with nothing plugged into any of the protected receptacles.
I think the too-tight staples caused some capacitive coupling from hot to neutral, enough to trip the GFI.
My solution was to install a GFI at each outlet. Wish I'd had a megger then, it would've been interesting to see the extent to which the insulation was compromised.