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DC safety switches

DC safety switch Non-fusable
DC safety switch 250 Volt
DC safety switch outdoor

Buy: $135
3-pole / outdoor/ 30 amp DC/ non-fuse
30 amp DC 240 volt outdoor
Grounding lugs at Amazon

Difference between AC and DC safety switch wiring

How to wire safety switch
DC safety switch Fusable
DC safety switch 250 Volt
DC safety switch indoor

Buy: $335
3-pole / outdoor/ 30 amp DC/ fuseable
30 amp DC safety switch

30 amp DC safety switch/ fusable/ outdoor

Heavy Duty 250 V Dc Voltage; 30 Ampere
Use 10 gauge wire
Do not use fuses larger than amp rating of wire
Buy:
Square D 30 amp DC HU361RB
30 amp DC 240 volt 600 Volt

Resource:
Generic: How to wire safety switch
Convert AC water heater to DC water heater
DC relays for solar power
DC safety switch wiring/ pdf
Schneider safety switch wiring for DC/ pdf
Schneider safety switches/ pdf
30 amp DC safety switch

60 amp DC safety switch/ fusable/ outdoor

Heavy Duty 250 V Dc Voltage; 60 Ampere
Use 10 gauge wire with 30 amp fuse
Use 6 gauge wire with 60 amp fuse
Buy:
Square D 60 amp DC H222AWK


Resource:
Generic: How to wire safety switch
Convert AC water heater to DC water heater
DC relays for solar power
DC safety switch wiring/ pdf
Schneider safety switch wiring for DC/ pdf
Schneider safety switches/ pdf
Class R fuses

Bussman

Buy
60 amp DC cartridge fuse
50 amp DC cartridge fuse
40 amp DC cartridge fuse
35 amp DC cartridge fuse
30 amp DC cartridge fuse
25 amp DC cartridge fuse
20 amp DC cartridge fuse

70 amp DC cartridge fuse
90 amp DC cartridge fuse
80 amp DC cartridge fuse
125 amp DC cartridge fuse
150 amp DC cartridge fuse
175 amp DC cartridge fuse
200 amp DC cartridge fuse
225 amp DC cartridge fuse
250 amp DC cartridge fuse
300 amp DC cartridge fuse
350 amp DC cartridge fuse
600 amp DC cartridge fuse
Buy
Class R fuses at Amazon
30 amp Cartridge fuse
60 amp Cartridge fuse
Busman fuses at Amazon

Resource:
Busman fuses/ pdf
600 volt AC @ 30 amp fuse/ 300 volt DC @ 15 amp
600 volt AC  @ 600 amp/ 120 volt DC @ 60 amp
6000 volt AC @ 6000 amp/ 300 volt DC 2000 amp
Time delay fuse passes surge currents without sacrafice short circuit limitation
AC rating for 200 kA is reduced to 20 kA for DC
kA is max surge capability... if too much surge is on the fuse, the fuse will not trip and fuse can melt onto the contacts, feeding high voltage into the wire causing possible fire

How to wire safety switch
PV safety switch

Example DC safety switch for solar array

Use fused or non-fused

This is one way to use safety switch

Purpose of safety switch is to ensure all power is OFF
The handle is clearly visible and can be latched in place
Locate safety switch in plain sight so people can clearly identigy when power is OFF
Remember, a solar panel will produce electricity each time it is exposed to light.
You can get shock from solar panel when panel is exposed to sun.
The array and safety switch must be wired at night

The strings can be combined before connecting to safety switch... match total volts and amps with safety switch rating and with fuse rating

When three panels are wired together, the positive wire connects to negative wire to make a string.
Solar panels are like batteries.
When three panels are connected in series, or in a string, then voltage increases with each additional panel, but amperage stays the same.
Illustration shows 3 strings with 3 panels in each string.
If the strings are combined together in parallel, then the voltage stays the same but amperage increases.
Maximum voltage for wire and safety switch is 600 volts AC/ 300 volt DC

Resources:

Calculate volts and amps for array/ How to set up array
DC safety switch wiring/ pdf
DC safety switch

100 amp Non-fusable/ outdoor

250 VDC 30 amp
Buy:
100 amp non-fusable/ outdoor/ at Amazon

Resource:
Generic: How to wire safety switch
Convert AC water heater to DC water heater
DC relays for solar power
How to wire safety switch
DC to DC relay   DC power relay
250VDC    25 amp                        400VDC  200 amp

These are the big boys
Connect big volts and amps to the contacts
Operate the coil using 12-24 Volt DC

DC to DC relay/ mechanical type

240 Volt DC power relay /26 amp to 200 amp DC

Full on-off contacts/ 12 or 24 volt DC coil
250 volt / 25 amp DC load
250V x 25 amp = 6250 watt
Connect 12 or 24 volt DC to terminals 3-4;
Connect load to terminals 1-2

Buy:
Electromechanical DC-DC G9EB-1 relay
G9EB-1-B-DC24
24 VDC coil and 400 VDC/ 200 amp contacts
Omron relay at online
Fuseholder

Resources:
Omron-DC-DC-relay-Datasheet
Omron DC-DC pdf
DC power relay spec sheet
Convert AC water heater to DC water heater
DC relays for solar power


Multimeter

Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
Buy:
Multimeters at Amazon
Electric testers at Amazon 
Resource:
How to test and replace element
How to test thermocouple
Element tests for 120 volts
How to test wire
Safety when testing wires:
Never touch wet or previously flooded appliance.
Never stand on wet surface when working on electric.
Never stand on bare soil, put down dry boards.
Tape tester leads to wood sticks to keep hands away from power.
Use non-contact voltage tester before touching wires.
Never touch or lean into any made of metal.
Remove metal objects from pockets.
Do not use oxygen or fuel accelerants in same room as electrcial repairs

Resource:
Basic house wiring

Non-contact voltage tester

Test for power without touching connectorss
NEVER assume power is OFF
Buy:

Non-contact voltage tester Amazon
Electric testers at Amazon
 
Resource:
How to test electric power is off

Resource:
How to install terminals
Treminals

Terminals

Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Read about terminals
wire connector assortment

Twist-on wire connector assortments

Do not reuse old connectors 
Buy

Connector assortment at Amazon
Connector assortment at Amazon

Resource
How to select and install twist-on wire connectors
Weatherproof wire connector

Weatherproof wire connector

Connector cavity is full of silicone
Built-in cover keeps silicone in place
Protect from water, dust etc
Buy from my affiliate links
Weatherproof size 14 to 6 Amazon
Weatherproof size 22 to 8 Amazon

Resource
How to select and install twist-on wire connectors
Wire connector wrench

Wrench to apply wire connectors

Tighten connector 
Buy

Wire connector blaster
Twist connector wrenches at Amazon

Resources:
How to twist wire
How to select and install twist-on wire connectors
Push on wire connectors

Push-on wire connectors in place of twist-on connectors

Buy:
Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
add solder to stranded wire

Turn stranded wire into solid wire

Add solder to 1" length of tightly twisted stranded wire to make into solid wire
Heat wire. Touch solder to wire. Let cool. File away over-solder.
Buy:
soldering guns
Resource

Timer caught fire

linesman pliers
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
End cutting nippers at Amazon

Fire inside timer caused by stranded wire
Keep enclosure door closed at all times

Fire caused by stranded wire

Do not use stranded wire under screw plate

Applies to timers, switches, outlets, pumps etc.
Small devices, with small loads, such as lamp socket, stranded wire is fine
Add solder to 1" length of tightly twisted stranded wire to make into solid wire
Heat wire. Touch solder to wire. Let cool. File away over-solder.
Buy:
soldering guns
Resource

Timer caught fire

Orange 10 gauge 30 amp


Orange/ #10 gauge for for 30 amp circuits including water heater
with ground
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp

NMB is house wiring
UF is underground

Yellow 12 gauge 20 amp


Yellow/ #12 gauge wire for 20 amp
with ground
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

Rolls of stranded wire

NMB is house wiring
UF is underground
White 14 gauge 15 amp


White/ #14 gauge wire for 15 amp
with ground
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground

Copper ground wire
Use same size as other wire in circuit

Buy
Spools of ground wire
Ground rods at Amazon

Basic household wiring
Basic water heater circuit

Figure volts amps watts for electric water heater
Test elements
Replace elements
How to wire tankless electric
How to change water heater temperature using timer
Change water heater from 240Volt to 120Volt
Replace thermostats
How to wire thermostats
How to wire water heater for off peak operation

How to twist wire
How to wire Cooper 277 pilot light switch
How to wire combo switch-outlet
How to replace 3-speed fan switch
 

How to wire dimmer
How to wire 3-way dimmer
How to wire occupancy switch
How to wire motion detector
How to wire TM811 and TM8111 switches
How to wire wall timers
How to wire box timers
How to wire off-delay timer
Wire off-delay timer
How to wire pin timers

How to wire and troubleshoot photo eyes
Reverse photoeye so it turns on in day
24 Volt photoeye
24 volt programmable timer

How to wire switches
How to add switch
How to add 3-way switch


Timer for 3-way switch
Timer for 4-way switch

How to add outlet 
How to wire 3-way switches
How to wire 4-way switches


Troubleshoot Malibu outdoor lights
Terminals 
Select and install wire connectors
Select wire size

Electrical formulas
Electricians forum
 

Electrical pages


How to wire arc fault breaker
How to wire GFCI
How to wire GFCI combo

Basic water heater circuit
How to wire water heater for 120Volt
Install old work box

How to drop wire from attic
Wire connector

How to wire 240volt outlets
How to install 3-phase timer
How to wire 3-phase outlets
How to wire 3-phase surge protector
What is 3-phase

How to wire whole house surge protector
How to wire under-counter water heater
 

See inside main breaker box
Replace breaker
Install subpanel

Fuseholder
Contactors
How to solder wires
Whole house surge protector
3-phase surge protection
Circuit breakers

Difference between 120 volt and 240 Volt
Difference between 50Hz and 60Hz
How to install electric meter on water heater
How to wire water heater thermostat
How to wire water heater with switches and timers

6x6x4 Enclosures
Intermatic timer enclosures

Convert AC water heater to DC
How to wire DC solar water heater
DC relays for solar water heater
How to add another thermostat to water heater

How many Kwh to heat water
Chart for figuring heating time for electric heater
Gas and electric water heaters Industrial electric at Amazon

Industrial supplies at Amazon

Industrial and scientific Amazon
Intermatic control centers Intermatic control centers:
+ manuals and parts


Including Z-wave
box timers Compare box timers

Control with Z-wave
programmable timer Compare programmable timers

Control water heater with programmable wall timer
Countdown timers Compare countdown timers

Control water heater with countdown timer
Compare power packs

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