|
Post by Guester on Jul 10, 2019 14:01:33 GMT -6
Asking here as without a paid NFPA membership, I don't see how I can find out this early in the game, before the new book is printed. 230.71 (draft below) is being updated to further restrict the use of the 6 switch rule for services. I am wondering if there will be updated rules in the 2020 NEC for section 225.33 that will in essence be the same as the new rules for 230.71, or is 225.33 going to continue as its own section with less stringent requirements?
Here is the text of the new 230.71 rule:
(B) Two to Six Service Disconnecting Means.
Two to six service disconnects shall be permitted for each service permitted by 230.2 or for each set of
service-entrance conductors permitted by 230.40, Exception No. 1, 3, 4, or 5. The two to six service
disconnecting means shall be permitted to consist of a combination of any of the following:
(1) Separate enclosures with a main service disconnecting means in each enclosure
(2) Panelboards with a main service disconnecting means in each panelboard
(3) A service disconnect in a switchboard where there is only one service disconnect in an enclosure
(4) A service disconnect in switchgear that is located in its own separate compartment
Informational Note: See 408.36, Exception No. 3, for service equipment in certain panelboards, and
see 430.95 for service equipment in motor control centers.
|
|
|
Post by Electrical Code Academy Staff on Oct 12, 2019 9:59:18 GMT -6
Greetings Guester,
You are correct that the rules have changed. The 6 disconnect rule changes mainly when dealing with a single enclosure but still allows up to 6 individual enclosures and so on as listed in 230.71.
Now, since the concern was the lack of ability to turn off power to the entire assembly the change above will only be for service applications. The requirement for 225.33(A) will not change:
225.33(A) General. The disconnecting means for each supply permitted by 225.30 shall consist of not more than six switches or six circuit breakers mounted in a single enclosure, in a group of separate enclosures, or in or on a switchboard or switchgear. There shall be no more than six disconnects per supply grouped in any one location.
Since the "feeder" can be shut down the same level of hazard doesn't exist so the rule change in 230.71 will only apply to services.
|
|