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ThreePhaseEel
ThreePhaseEel
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You'll want a relay with high/low separation

Your primary problem is that you need (by Code) to separate the 24V irrigation wiring from your 240V mains wiring in a fashion that won't let some mishap put 240V on the 24V circuit, ruining your irrigation controller and potentially even starting things on fire. Furthermore, your relay needs to be fully UL listed (not just RU component recognized aka Rather Useless to us) for use at mains voltage, which leads us to one choice given the separation requirements, namely the Functional Devices RIBT24P. This provides us with a 24VAC coiled, UL listed DPDT enclosed relay capable of handling a 2HP 240V motor and fitted with an enclosure barrier to keep the 24V and 240V streams from crossing.

This relay then attaches to ayour relay box at the pressure switch location via its ½" nipple, and gets its NO contact(s) wired in parallel with the contacts on the pressure switch using some wirenuts, as the RIBT24P's high-voltage leads are brought out as pigtails in the box. The NC wires on the relay then get capped off by themselves, the low-voltage terminals get hooked up to the irrigation controller using a suitable low-voltage cable, and a 4" square blank box cover gets put on the relay enclosure itself to finish the job.

You'll want a relay with high/low separation

Your primary problem is that you need (by Code) to separate the 24V irrigation wiring from your 240V mains wiring in a fashion that won't let some mishap put 240V on the 24V circuit, ruining your irrigation controller and potentially even starting things on fire. Furthermore, your relay needs to be fully UL listed (not just RU component recognized aka Rather Useless to us) for use at mains voltage, which leads us to one choice given the separation requirements, namely the Functional Devices RIBT24P. This provides us with a 24VAC coiled, UL listed DPDT enclosed relay capable of handling a 2HP 240V motor and fitted with an enclosure barrier to keep the 24V and 240V streams from crossing.

This relay then attaches to a box at the pressure switch location via its ½" nipple, and gets its NO contact(s) wired in parallel with the contacts on the pressure switch. The NC wires on the relay then get capped off by themselves, the low-voltage terminals get hooked up to the irrigation controller using a suitable low-voltage cable, and a 4" square blank box cover gets put on the relay enclosure itself to finish the job.

You'll want a relay with high/low separation

Your primary problem is that you need (by Code) to separate the 24V irrigation wiring from your 240V mains wiring in a fashion that won't let some mishap put 240V on the 24V circuit, ruining your irrigation controller and potentially even starting things on fire. Furthermore, your relay needs to be fully UL listed (not just RU component recognized aka Rather Useless to us) for use at mains voltage, which leads us to one choice given the separation requirements, namely the Functional Devices RIBT24P. This provides us with a 24VAC coiled, UL listed DPDT enclosed relay capable of handling a 2HP 240V motor and fitted with an enclosure barrier to keep the 24V and 240V streams from crossing.

This relay then attaches to your relay box via its ½" nipple, and gets its NO contact(s) wired in parallel with the contacts on the pressure switch using some wirenuts, as the RIBT24P's high-voltage leads are brought out as pigtails in the box. The NC wires on the relay then get capped off by themselves, the low-voltage terminals get hooked up to the irrigation controller using a suitable low-voltage cable, and a 4" square blank box cover gets put on the relay enclosure itself to finish the job.

Source Link
ThreePhaseEel
ThreePhaseEel
  • 86k
  • 32
  • 143
  • 239

You'll want a relay with high/low separation

Your primary problem is that you need (by Code) to separate the 24V irrigation wiring from your 240V mains wiring in a fashion that won't let some mishap put 240V on the 24V circuit, ruining your irrigation controller and potentially even starting things on fire. Furthermore, your relay needs to be fully UL listed (not just RU component recognized aka Rather Useless to us) for use at mains voltage, which leads us to one choice given the separation requirements, namely the Functional Devices RIBT24P. This provides us with a 24VAC coiled, UL listed DPDT enclosed relay capable of handling a 2HP 240V motor and fitted with an enclosure barrier to keep the 24V and 240V streams from crossing.

This relay then attaches to a box at the pressure switch location via its ½" nipple, and gets its NO contact(s) wired in parallel with the contacts on the pressure switch. The NC wires on the relay then get capped off by themselves, the low-voltage terminals get hooked up to the irrigation controller using a suitable low-voltage cable, and a 4" square blank box cover gets put on the relay enclosure itself to finish the job.