Ontario solar label kits
Engraved in Burlington, twenty minutes from most of the GTA. Built to ESA Bulletin 64-5-4 and ESA-SPEC-004 — including the two utility plates that generic kits leave out and inspectors ask for.
Grid-tied, string inverter, no storage. Microinverters bring it to 16.
Per plate plus engraved area, shown in full on the last screen before you send anything.
From approved artwork. Same-week across Burlington, Oakville, Hamilton, Milton, Mississauga and Toronto.
Three layers, not one
1 · The CEC base set
Section 64 and Section 84 of C22.1:24 — the 64-200 photovoltaic warning sign (white on red, capitals at least 9.5 mm under 64-200(3)), the terminals-energized warnings, disconnect identification, the 84-030(2) single-line diagram plate and the 64-218(7) first-responder placard.
2 · ESA’s own set
ESA-SPEC-004 R1 brings the two-power-source warnings and the DG source disconnect identification. ESA Bulletin 64-7-2 adds the UL 9540 evaluation label where a multi-part ESS is stacked, and ESA-SPEC-008 covers field-evaluated installations.
3 · Your LDC
This is where kits fail. Ontario has dozens of local distribution companies and two of the big ones publish their own plate requirements.
Hydro One (DP-12-003 R0, s.2.4.2(j)) wants a MicroDER disconnect switch tag and a derated-capacity plate.
Toronto Hydro (Conditions of Service Ref. 3 Rev. 8, January 2026) wants two lamicoids at the DG disconnect — “MAIN DG DISCONNECT” and “WARNING / TWO POWER SOURCE / PARALLEL SYSTEM” — and sets no colour or size. The white-on-black 75 × 19 mm “GENERATOR METER” plates come from its legacy FIT/microFIT two-meter standard (DCS 17-9610, 2013), which only applies to those older sites. They are extras in the builder, cut white on black at 75 × 19 mm, for anyone still working on one.
Tell us the LDC and it’s handled. Leave it off and you get the base Ontario set without the utility plates.
ESA does not require lamacoids. Bulletin 64-5-4 Q7/A7 says labels must withstand the elements and be permanent and legible — “for example: lamacoid, engraved metal plate, or equivalent.” Q6/A6 adds that Rules 2-100 and 84-024 require the labels but don’t specify wording. Lamacoid is an accepted example in Ontario, not a mandate.
The two plates Ontario adds
Beyond the national base set. Both come out of ESA's own material rather than from C22.1 — one is the distributed-generation source disconnect, the other covers fuse holders that have no integral disconnecting means.
| Plate & rule | Where it goes |
|---|---|
| Fuse replacement warning 14-402 & 64-060(3)(c) (ESA 64-5-4 A3; ESA 64-1-5 s.3) | Where a disconnecting means for fuses is not integral with the combiner box - installed within sight and within 9 m of the fuse holder. |
| DG source disconnect / utility interconnected 2-100 & 84-024 (ESA 64-5-4 A6: rules require labels, not wording) | At the distributed-generation source disconnecting means. |
| Alectra distributed generation disconnect Alectra Micro DER Information Package s.8.2 and s.8.5.2(h) | On the DG disconnect switch, mounted with the meter on the exterior wall 1.7-2.1 m above grade. |
| Alectra numbered DG disconnect (three-phase) Alectra Non-Micro DER Information Package s.12.2 | DG2 on the distributed generation disconnect; DG1 at the main service disconnect switch where applicable. |
| Alectra main service disconnect Alectra Non-Micro DER Information Package s.12.2 | On the main service disconnect switch. |
| Alectra metering cabinet lock-out warning Alectra Non-Micro DER Information Package s.12.2 | On the main service metering cabinet. |
| Alectra meter base - net metered generation Alectra Micro DER Information Package s.8.2 (OESC 84-030(1)) | On the meter base (Alectra also requires the lamacoid single-line diagram there). |
| Field-derated inverter capacity OEB DERCP s.5.1 conditions 1-2; ESA 64-1-5 Answer 2 item 2 (Rules 64-112, 8-104, 14-100) | On the inverter, adjacent to its nameplate (DERCP s.5.1: 'clearly indicated on the equipment, adjacent to the nameplate'). |
| DG system disconnect - two power sources (ESA-SPEC-004) OESC 84-024 & 2-100 (ESA 64-5-4 A6: wording is guidance) | On the DG system (utility) disconnecting means, recommended adjacent to the utility meter(s). |
| Danger - high voltage boundary notice (over 750 V dc) ESA 64-3-5 Answer 2 (condition for exemption from 36-006, 36-100, 36-110; with 64-202(5)) | Boundary fence: beside the lock on every access gate, at every outside corner, and at intervals not over 15 m. Rooftop: on every door giving access to the array area. |
| London Hydro DER lock-out notice (DER over 20 kW) London Hydro EI-27 R0 (12/24) s.3.4.5.2 | At the point of disconnection and the DER feeder cell. |
| London Hydro multiple power sources sign (DER over 20 kW) London Hydro EI-27 R0 (12/24) s.3.4.5.1 | At the point of disconnection, the DER feeder cell and electrical room / fence door(s). |
| Maximum fuse size at the DG disconnect Alectra Micro/Non-Micro DER packages s.8.2 / s.12.2; Hydro Ottawa MCS0102 Note H | On the fused DG / DER disconnect switch. |
| Hydro One MicroDER disconnect switch Hydro One DP-12-003 R0 s.2.4.2(j) (OESC 84-024) | On the utility-accessible external disconnect switch (EDS) of a micro-embedded (12 kW or less) facility in Hydro One territory. |
| Warning - power fed from more than one source (Hydro Ottawa) Hydro Ottawa MCS0083 R5 Note E / MCS0085 R4 Note Q (C22.2 No. 107.1 cl. 15.4.1.3 wording) | Three per job: meter socket base, customer-owned service panel, DER (DG system fused) disconnect switch. Hydro Ottawa's own labels are white on red (MCS0102 Note A). |
| Toronto Hydro legacy DG system disconnect (black) Toronto Hydro DCS 17-9610 Rev 1 note 4 (legacy) | Fastened permanently to the isolating device. Size 75 x 19 mm (3 x 3/4 in). |
| Toronto Hydro legacy generator meter (black) Toronto Hydro DCS 17-9610 Rev 1 note 6 (legacy) | On the respective meter base (load / generator). Size 75 x 19 mm (3 x 3/4 in). |
| Toronto Hydro legacy load meter (black) Toronto Hydro DCS 17-9610 Rev 1 note 6 (legacy) | On the respective meter base (load / generator). Size 75 x 19 mm (3 x 3/4 in). |
| Toronto Hydro legacy two power source system (black) Toronto Hydro DCS 17-9610 Rev 1 note 5 (legacy) | Fastened permanently to the meter base. Size 75 x 19 mm (3 x 3/4 in). |
| Toronto Hydro main DG disconnect Toronto Hydro Conditions of Service Ref. 3 Rev 8, App. 1(i) s.1.1.2 (OESC 84-026 referenced) | On the DER main disconnect (within 2 m of the revenue meter for single residential micro-embedded; exterior-wall disconnect in series if the meter is in the basement). |
| Toronto Hydro two power source warning Toronto Hydro Ref. 3 Rev 8, App. 1(i) s.1.1.2 and s.3 | On the DER main disconnect; s.3 also requires it on the point of disconnection, the DER feeder cell and the switch-room door. |
| Warning - two power sources OESC 84-030(1) / 84-024 (utility wording) | Alectra: on the distributed generation disconnect switch. ESA-SPEC-004 LDCs: on the main breaker of the distribution panel, any sub-panel/switch where feedback is possible, and adjacent to the revenue meter(s). |
| Warning - two power sources parallel system Alectra Non-Micro DER Information Package s.12.2 | On the main service disconnect switch and on the main service metering cabinet. |
Which LDC is the whole question
Ontario has more local distribution companies than the rest of the country combined, and the two largest publish plate requirements that nothing else in Canada asks for. Tell us the LDC on the order and it is handled; leave it off and you get the base Ontario set.
Section 2.4.2(j): a MicroDER disconnect switch tag and a derated-capacity plate. Rural and small-town Ontario, which is most of the province by area.
“MAIN DG DISCONNECT” and “WARNING / TWO POWER SOURCE / PARALLEL SYSTEM” at the DG disconnect, no colour or size set. White-on-black meter plates are legacy FIT/microFIT only, and in the builder as extras.
Alectra, Elexicon, Hydro Ottawa, London Hydro and the rest publish no plate wording. The CEC set plus ESA's two, and the inspector settles the rest.
Ontario kits
| Ontario job | Plates |
|---|---|
| House — microinverters | 16 |
| House — string inverter | 21 |
| House — with battery storage | 24 |
| Commercial rooftop | 29 |
Other provinces: British Columbia · Alberta · Saskatchewan · Manitoba · Nova Scotia · the job checklist