Bigjabe
Member
- Location
- Vancouver BC
Hi all,
I've read countless threads on this topic, but they all have to do with NEC, not CEC. Here's my application:
500kVA 13.8-0.6V, delta wye, with primary overcurrent protection at 125%. I want to feed this over to an 800A splitter (5m cable length between them) with a bunch of 60A fused disconnects connected to it. Now, I know in the NEC it says that if the transformer is wye secondary you need secondary protection, but I don't see any such rule in the CEC. There are many clauses about not requiring primary protection if secondary is installed, but I don't see anything requiring secondary protection at all. Just wondering if any fellow Canadians have any experience with inspectors on this issue.
While we're on the subject, I think 14-100 b) allows the conductors from the splitter to the 60A fused disconnect to be sized for 60A, but I'd like to confirm that as well. Disconnects will be wired from the splitter through rigid conduit, about a foot distance.
14-100
Each ungrounded conductor shall be protected by an overcurrent device at the point where it receives its supply
of current and at each point where the size of conductor is decreased, except that such protection shall be
permitted to be omitted in each of the following cases:
(b) where the smaller conductor
(i) has an ampacity not less than the combined computed loads of the circuits supplied by the smaller
conductor and not less than the ampere rating of the switchboard, panelboard, or control device
supplied by the smaller conductor;
(ii) is not over 3 m long;
(iii) does not extend beyond the switchboard, panelboard, or control device that it supplies; and
(iv) is enclosed in non-ventilated raceways, armoured cable, or metal-sheathed cable when not part of the wiring in the switchboard, panelboard, or other control devices;
Thanks!
I've read countless threads on this topic, but they all have to do with NEC, not CEC. Here's my application:
500kVA 13.8-0.6V, delta wye, with primary overcurrent protection at 125%. I want to feed this over to an 800A splitter (5m cable length between them) with a bunch of 60A fused disconnects connected to it. Now, I know in the NEC it says that if the transformer is wye secondary you need secondary protection, but I don't see any such rule in the CEC. There are many clauses about not requiring primary protection if secondary is installed, but I don't see anything requiring secondary protection at all. Just wondering if any fellow Canadians have any experience with inspectors on this issue.
While we're on the subject, I think 14-100 b) allows the conductors from the splitter to the 60A fused disconnect to be sized for 60A, but I'd like to confirm that as well. Disconnects will be wired from the splitter through rigid conduit, about a foot distance.
14-100
Each ungrounded conductor shall be protected by an overcurrent device at the point where it receives its supply
of current and at each point where the size of conductor is decreased, except that such protection shall be
permitted to be omitted in each of the following cases:
(b) where the smaller conductor
(i) has an ampacity not less than the combined computed loads of the circuits supplied by the smaller
conductor and not less than the ampere rating of the switchboard, panelboard, or control device
supplied by the smaller conductor;
(ii) is not over 3 m long;
(iii) does not extend beyond the switchboard, panelboard, or control device that it supplies; and
(iv) is enclosed in non-ventilated raceways, armoured cable, or metal-sheathed cable when not part of the wiring in the switchboard, panelboard, or other control devices;
Thanks!
