Yes, that’s fine. The breaker in the main panel needs to protect the wiring to the subpanel. Obviously, a 70A panel will not be damaged by 40A of power.
Can I put a 50 amp breaker in a 50 amp sub panel?
Yes you could, but if the sub-panel load is 50 amps or greater, the 50 amp breaker in the main panel will trip. Yes you can. the problem is that when a breaker opens, you will not know which one.
What size wire do I need for a 70 amp sub panel?
For 70 amp, the right wire is either a gauge 3 aluminum or a gauge 4 copper.
Can I put a 50 amp breaker in a 60 amp sub panel?
Regardless of what all the individual breakers add up to, the maximum you can draw through that subpanel is 60amps.
Can you run a 60 amp sub panel off 100 amp main?
Yep, just because the sub-panel is 100 amps, the breaker in the main panel (and probably the wire feeding it) limits you to 60 amps. If you are NOT running the other loads, then you could put a 40 amp breaker in and charge @ 32 Amps.
How many breakers can I put on a 70 amp sub panel?
You can run 100 circuits, each to a device that pulls 70 amps, but you can only run 1 of those devices at a time. You can run 70 circuits that each serve a 1 amp load and run them all at once.
How many circuits can I run off a 50 amp sub panel?
A single receptacle has a maximum power draw of 1.5-amps, so, only use 26 outlets at most for a 50-amp breaker (40-amps ÷ 1.5-amp = 26.67 outlets).
Can 6 gauge wire handle 70 amps?
In particular, a 4 AWG copper cable can hold at least 70 amps of electricity before giving up. Meanwhile, a 6 AWG copper wire can only hold up to 55 amps before it falters.
What wire do I use for 70 amps?
Wire Size and Amp Ratings
| Wire Size | 60°C (140°F) | |
|---|---|---|
| AWG | (mm²) | Copper |
| 6 | (13.3) | 55 |
| 4 | (21.2) | 70 |
| 3 | (26.7) | 85 |
What size wire do I need to run 300 feet?
for 300 feet for 100 amp rated service I would use Aluminum direct burial 1/0-1/0-1/0-1/0, the forth can be as low as #4 for the ground (but also in conduit, even if in conduit must still be rated underground wire and required by code also) Also note the size wire the breaker can handle, cannot cut strands to make fit, …
How far can I run 6 2 wire?
150 Foot Run – A 120-volt circuit on a 20 amp breaker will require 6/2 AWG wire for 150 feet.
How far can I run number 6 wire?
As an example, for a 120-volt circuit, you can run up to 50 feet of 14 AWG cable without exceeding 3 percent voltage drop.
For 240-volt circuits:
| 14 AWG | 100 feet |
|---|---|
| 10 AWG | 128 feet |
| 8 AWG | 152 feet |
| 6 AWG | 188 feet |
What wire size do I need to go 100 feet for a 60 amp service to a workshop?
What size wire should I use for a 60 amp subpanel? You can get away with 6 AWG when you have a short run of wire, however, due to voltage drop, if you ever decide you want to go more than 100 feet then a 4 AWG is the size you should choose.
Can 8 gauge wire handle 60 amps?
An 8-gauge copper wire can handle 50 amps at 167 degrees F but an 8-gauge aluminum wire at the same ambient temperature rating will only carry 40 amps. Overall, you need a 4-gauge wire or greater to handle 60 amps.
What size wire do I need to run 60 amps 200 feet?
60 amp wire size is either 6 AWG or 4 AWG wire (AWG stands for American Wire Gauge; standard wire sizing is the US) for 220V voltage. An amateur will use a 6 AWG wire size for 60 amp 220V. A professional will always use 4 AWG wire size for 60 amp 220V.
How many breakers can a 60 amp sub panel have?
The minimum amperage panel for modern homes is 100, 150, or 200-amps. The NEC does not allow installing panels rated below 100-amps as the main electrical panel for the house. Modern 60-amp electrical panels are purpose-built as sub-panels and generally only have 8 to 10 slots available for circuit breakers.
How many breakers can be in a 40 amp sub panel?
A 40A/240V panel can support as many as 10 or more 120V/15A circuits, presuming they won’t all be heavily loaded at the same time. You might even be able to upgrade the power feed later. Many panels are sold as 4 spaces/8 circuits.
Can breakers add up to more than Main?
It is very common for the sum of the branch circuit breakers to add up to more than the main circuit breaker. The engineer that originally designed the building and electrical system understood that the loads were intermittent, and very unlikely to be maxed out at the same time.
