Grinder Pump Float Signal wire type and gauge

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Jons

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Have to wire a Meyer grinder located in an outdoor holding tank located 125 feet from panel/alarm inside the residence.

I'll be feeding the signal wires through 3/4" T&B Smurf conduit. Just wondering the type and gauge wire I need to source for to carry the signals the 125 foot distance from the outdoor grinder to the indoor panel/alarm station. As far as the grinder power, the 2 HP grinder will be fed off a subpanel appropriately fed from the house's main panel. No question(s) regarding that part of the install.
 
All I've ever seen are float switches that can be either LV or 120v. Really no current involved so I see no reason you can't use THWN of a size determined by whatever the OCP is for the control circuit, if any.

-Hal
 
do you have any info on the control panel? mfg/model/pn etc
most I have seen are 120 but only drive a relay (which drives the contactor)
 
If the floats are intrinsically safe you might need a shielded wire. Been a while since I have done one.
 
Grinder pump signal wire gauge

Grinder pump signal wire gauge

It is a Simplex panel. Will get the model # tomorrow as it's 300 miles north of my location today. I'm still concerned about "crosstalk" between the single phase 220 and the signal wires (9 of them I believe), in a 1" PVC conduit over a distance of 125'. Grinder is a 2 HP Meyers. I will have 3 floats and the thermal wires and one other signal wire and perhaps a spare. Was thinking if high voltage, then #12 would suffice for signal wires. Power will be tapped off subpanel 35 feet away, so I believe #12 would suffice to power grinder pump.
 
If he is, he will need explosion proof seals so methane gas doesn’t travel up conduits. Nobody mentioned so I wasn’t assuming.

Put the thermal wiring with pump wiring and all the float switches in another raceway.
 
Jons said:
It is a Simplex panel. Will get the model # tomorrow as it's 300 miles north of my location today. I'm still concerned about "crosstalk" between the single phase 220 and the signal wires (9 of them I believe), in a 1" PVC conduit over a distance of 125'. Grinder is a 2 HP Meyers. I will have 3 floats and the thermal wires and one other signal wire and perhaps a spare. Was thinking if high voltage, then #12 would suffice for signal wires. Power will be tapped off subpanel 35 feet away, so I believe #12 would suffice to power grinder pump.
Click to expand...

Why do you think they are "signal" wires? Thermal wires? You mean power for heat tape?

-Hal
 
Grinder Control info - Meyers Simplex

Grinder Control info - Meyers Simplex

Here's the info on the controls...
Guy before me installed one 1 1/4" conduit...I'm hoping this will suffice for housing the power to the grinder and signal wires to the panel without having to worry about "crosstalk". Distance between grinder and panel is about 80 feet. Grinder is Meyers VS 20-21 2 horse grander/pump. Figuring 14 gauge copper THHN should suffice for signal wiring.
 

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Most installers in my area use Tray Cable, its direct burial rated, shielded and pairs are twisted, no issues with cross talk
 
Grinder Pump wiring

Grinder Pump wiring

tom baker said:
Most installers in my area use Tray Cable, its direct burial rated, shielded and pairs are twisted, no issues with cross talk
Click to expand...

Thanks Tom...here's what I have:

First 100 feet with power wire and signal wires segregated by distance of 2" between wire sheaths. Signal wire is #14 THHN, non twisted in jacket rated for direct burial, sunlight resistant cable.

Last 25 feet is 1 1/4" PVC conduit with both the signal and power conductors fed through conduit to the grinder.

Is crosstalk a serious enough issue in this configuration, or should I remove the signal wires from the conduit and trench a separate feed? All conductors will terminate in the j-box rated for this purpose, inside the tank. Or if crosstalk in this application is a serious concern, then I guess I should get some tray cable and install that as you mentioned previous. In a perfect world, I would like to leave things the way they are. To be honest, I'm not too spun up on the level of crosstalk one may expect while having the power and signal wires in the same 1 1/4 conduit. there's plenty of room for 9 #14s and 4 #12s in a 1 1/4" conduit, but I do realize crosstalk is related to radiated energy and distance (we all know for a fact these signal and power conductors are co-mingling and touching each other in the 25' conduit run to the tank).
 
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Jons said:
Thanks Tom...here's what I have:
Last 25 feet is 1 1/4" PVC conduit with both the signal and power conductors fed through conduit to the grinder.
.
Click to expand...

There are restrictions on power and signal in the same raceway, depending on the type of signal circuit. If the signal circuit is Class 2 wiring, it can't be in the same raceway as separate wires, but you could use tray cable and run that inside your raceway depending on fill.
 
the floats are 120 vac
2 drive/break the mtr contactor
1 a hi alm relay

interference won't be an issue
I thought cntl wire could share a conduit with mtr power if they controlled the mtr?
 
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Ingenieur said:
the floats are 120 vac
2 drive/break the mtr contactor
1 a hi alm relay

interference won't be an issue
I thought cntl wire could share a conduit with mtr power if they controlled the mtr?
Click to expand...
Only if the control circuit is treated as Class 1 and wired usung chapter 3 methods.

Sent from my XT1585 using Tapatalk
 
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