ECN Forum Forums Code Related Discussion NEC & other Code issues 230.70 / 230.90

Where in the code does it say that the service disconnect and the OCPD has to be seperate? The intent of the code IMO is met. Outside of running up the cost to the owner, how would a seperate disconnect provide additional protection or safety? The NEC is only about safety, not future capacity, efficiency or convienience.

It doesn't ?



I realize that, however I am not asking if there needs to be a separate disconnecting means. There is no service disconnecting means for one service conductor? I don't see where that is permitted.

The actual soultion is really the instructions labeled on the panelboard enclosure. It clearly states that the unit is not suitable for use as service equipment unless a main breaker is installed or with 6 disconnects or less when not used as a lightning and appliance panelboard.

It is be used as a lightning and appliance panelboard therefore a main is required in order for the equipment to be used as a service.

This has been a rather interestng discussion. I have posted this question on four separate Forums and have received completely mixed answers of yes and no. All good arguements either way.

230.79(A)

230.79 identifies the required rating of the service disconnecting means. There isn't one on the service I describe.

Or I should say, not one for ALL service conductors installed.

230.79(A) is for a single circuit service. If the is not applicable to your topic, what do you have that we do not know yet?

It's not a single circuit service. It's a 3-wire service.

Let's try another example. Say this was a 120/240V delta service. It is quite possible the B phase (208V) will have no loads at all. But, a service disconnecting means and overload device is required for that conductor. Right?

Back on my original question, doesn't 230.71(B) state that single pole units aren't permitted on multiwire circuits unless 2 or more are handle-tied together?

So again, where does the code allow service conductors to be installed and terminated at a panelboard without a disconnecting means and overload protection.

I'll begin by saying I have approved many installations like this for Traffic signals etc.

To satisfy the exact Code would two 1P15 breakers with a handle tie and labeled service disconnect, and the load on only one of the breakers work ? (Waste of material)
If that is too complex just remove one of the line side conductors. (Cheapens the job)

I'm dealing with guys that want to bury MC cable.

Terminate the second phase in the meter can, don't bring it to the panel, backfeed the 15a breaker with a clip and "Service disconnect" sticker. connect the load to another 15a breaker if you are a purist. (or the MLO lug? )

The solution Greg states is the way the manufacturer wants it done and the way I believe the code is worded.

If the intent is that the service disconnect removes power from the panelboard rails (not an unreasonable interpretation) backfeeding the 15a breaker is the only way you can do it. The operative question would be, with a single connected load, could the load be directly connected to the MLO lug, protected by the "main".