I’m trying to figure out if I’m allowed to include 2 relays on the same circuit. They will both be protected by a 20A fuse in the PDB and they will include their provided 20A fuse also.
Also, would I be able to do the same thing with my proxes. Wire them together in the same circuit and protected with the required 20A fuse they will need.
no.
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<R39> All active PD Board branch circuits shall be protected from overload with an appropriate value auto resetting Snap Action circuit breaker (from the KOP or identical equivalent).
B. Each relay module branch circuit must be protected with one and only one 20-amp circuit breaker on the PD Board. No other electrical load can be connected to the breaker supplying this circuit.*
Looks like IndySam is right about <R39> and the relays. Maybe you could tell us what your need for this for this sort of configuration is?
I don’t see anything wrong with the second part.
Same rules I read last night.
It doesn’t say that you are not allowed to have them in the same circuit. They will all be under the rules regarding fuses. They will all be connected to the same fuse therefore it adheres to the rules.
From what I’m understanding every relay must be protected by 1 and only 1 20A Fuse. Therefore they will be protected under the same fuse.
The rules also say that each relay has to have the breaker, and no other electrical load may be connected. As far as I understand, another relay is another electrical load.
I guess I misread your question. I figured you were talking about spikes. If you are talking about two regular relays I guess they would be considered part of the same custom circuit.
If you could explain what you are trying to do, there are some great electrical minds (mine not included) here that can tell you if you can or even should.
The potential problem lies within the second part of the rule.
<R39>B. Each relay module branch circuit must be protected with one and only one 20-amp circuit breaker on the PD Board. No other electrical load can be connected to the breaker supplying this circuit.
Perhaps if you provided a circuit diagram or:
I was talking about Spikes.
If another relay in the same circuit as a relay already installed is considered an electrical load then I guess the rule applies to it.
Their us is to control LEDs.
We believe there is not reason to connect them separately and we are trying to save some spots for motors and additional electrical loads such as proxes. If the proxes can be wired together under the same circuit then we won’t mind about the relays.
And related to the proxes? Are they allowed to be connected in the same circuit under the same fuse?
I assume by “proxes” you mean the photosensors? Or is this another part I’m not recognizing?
Those can be connected to the same circuit because they individually draw very little power, and a 20A circuit breaker is very excessive. They also have integrated short circuit protection.
Spike relays on the other hand could be potentially switching up to 20A per relay, and multiple ones could easily overload a single 20A breaker. I understand your particular application doesn’t pose this risk, but the rules must be able to apply broadly to be effective. As such, to the best of my understanding, you can only have one Spike per breaker.
You may have better luck considering a custom circuit board option for your LEDs, a little bit of LEDs, resistors and standard transistors from RadioShack and you could be in business with a single power soure and a couple of Digital Outputs. If you need help with that idea, let us know!
Matt
If “proxes” are some type of proximity sensor or the Kit photosensors then they may be connected together to a single 20A breaker. The power wires for each device should be spliced together so only a single wire is inserted into the WAGO terminals on the Power Distribution Board.
If you check the operations manual for the Spike you will see that you can control two loads with one Spike. Other wise, only one Spike per PD output please.