Questions tagged [gfci]

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Extension cord from grid through GFCI outlet to off grid inverter. Does the extension cord ground need connected?

I have an off grid system: PV, charge controllers, inverters, and batteries. I want to add a 120V grid input from a GFCI outlet through an extension cord directly into the inverter AC input. However, ...
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132 views

Does this circcuit pose a safety risk that could be avoided?

I was looking over the circuit design for OpenEVSE. I was specifically interested in the GFCI portion of the circuit: This circuit measures the current difference between Line and Neutral on a 120/...
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52 views

Should I expect the heating element in new cartridge heaters to be electrically isolated from the stainless steel exterior sheath?

I have two five-year-old 16 mm x 428 mm, 115 VAC, 1000 W cartridge heaters that have approximately 200 kΩ from the heater leads to the exterior stainless steel sheath. Is this normal or should I ...
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What are the implied peak current ratings of GFCI's?

Using GFCIs with transformer or other high-inrush current loads is problematic, because in some designs the differential transformer core can locally saturate and produce an invalid output in the ...
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Sensing Ground Faults on a High Voltage Pulser - Coupled Inductor Issue in LTSpice

I am building a ground-fault protected High Voltage Pulser. The pulses may be as high as 500V and as narrow as 50us (20kHz). The question of how to create GFCI protection is proving to be a ...
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62 views

Off-Grid Inverter causing a GFCI trip when charging EV

I have a transformer-less, 48VDC to 120/240VAC inverter that is off-grid. I have a 120VAC GFCI outlet wired to the inverter. When I plug my 120VAC EV charger into the outlet, the GFCI trips. It does ...
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47 views

Sanity check for current transformer burden resistor calculations

I'm hoping to use this(CR8420-1000-G) current transformer to detect ground faults of 20mA. Using the formulae in the datasheet: Here are my calculations: They say For best linearity, choose R ...