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How to override T101 with switch
Use only 600 volt wire.
Lamp cord, extension cords are not rated 600 volt.
Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.

30 amp breaker use 10 gauge /
120-240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire ... cannot be connected to 15-20-40 amp breaker.

Orange/ #10 gauge wire, with ground ... 30 amp capacity. Safe maximum: 30 x 80% = 24 amps.
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp
120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire.
... cannot be connected to 30-40 amp breaker. 1

Yellow/ #12 gauge wire, with ground ... 20 amp capacity. Safe maximum 16 amps.
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
HOOK UP Wires
White 14 gauge 15 amp
120 volt 15 amp outlet, AFCI, GFCI, timer, switch etc can be installed on 15 or 20 amp breaker. Never connect 15 gauge wire to 20-30-40 amp breaker.

White/ #14 gauge wire,  with ground ... 15 amp capacity. Safe maximum 12 amps.
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground
50-60 amp breaker use 6 gauge /
240 volt 50 outlet can be installed on 50 amp breaker only
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
240 volt 40 amp outlet can be installed on 40 or 50 amp breaker only
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
     
Copper ground wire.
Every device, load, metal enclosure etc must be grounded. Ground wire must be continuous throughout installation, never switched on-off, never used as a Neutral wire.
Generally ... use same size as other wire in circuit
Buy:
12 gauge copper ground wire
Ground wire
Green ground wire
Ground pigtails
Ground rods/ ground clamps at Amazon
armored cable
Non metallic flexible cables must carry ground wire, but do not have hazard of short circuit causing injury from shock.

Armored steel cable can be used as a grounded connection, and will protect wires from damage. Metal can be energized from an insulation failure.

All conduit ...metal, plastic ... flexible and rigid ... must be attached to structure, and attached to enclosures, boxes.
Movement, damage and deterioration are major cause of electrical failure.
Buy:
Non-metallic flexible conduit
Power whip
Armored cable
Southwire armored cable cutter
Pull boxes
Southwire armored cable cutter
Electrical tools must be insulated.
Always best to disconnect power, but insulation failure, lack of proper grounding, grounded neutral, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems still pose a risk to anyone working on electric power ... even when breaker is off.

Buy:
Electrician tools kits
KLEIN TOOLS
Tools kits
IRWIN tools
KNIPEX

Telephone cable knife
Low Voltage Mounting Bracket for Telephone
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
HOOK UP Wires

Protect wiring from damage
Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable.

-Code says: Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15
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End cutting nippers at Amazon


Electrically insulated tools
When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistance and heat on wire and creates possible weak point.
Buy tools:
KLEIN TOOLS
Wire strippers at Amazon
Electric Wire Stripping Machine
Linesman pliers
Utility knife at Amazon
multimeter
Multimeters
Voltage is tested across two separate wires. Ohms or resistance is tested across both ends of same wire. Amperage is tested along one or two points on same wire.
Buy:
Analog multimeter
Multimeters at Amazon
Klein multimeter
Electric testers at Amazon
Clampmeter for testing amp flow on line

GFCI circuit breaker
A GFCI circuit breaker will protect all boxes on circuit.

Circuit must be grounded. Ground wire must be continuous and connected to each piece of equipment.

White wire on circuit breaker must be connected to Neutral busbar inside the breaker panel.

Buy
GFCI circuit breakers
Push down
single-pole breaker
1" wide Push down breaker
Plug-in breaker
Buy single-pole:
Choose from 15 to 60 amp
Eaton CL series
Siemens 15-60 amp

Single-pole tandem breaker
Tandem breakers
Push down
double-pole breaker
2" wide Push down breaker
Plug-in breakers
Buy double-pole:
Choose from 15 to 125 amp
Choose from 15 amp to 200 amp
Eaton CL series circuit breaker
Siemens circuit breaker
Double pole GFCI
Override T100 series timer with 40 amp switch
T100 series timers are rated 40 amp, 5 HP max

Using a 40 amp motor control switch allows you to override any load that the timer successfully controls.

Watt or power consumption should appear on rating plate for each Load (motor, fan, lights, appliance etc)
Divide watts by the voltage ... in this case, the voltage for T101 is 120
... so if load consumes 3500 watts divided by 120 volt = 29 amps.
This is within the 32 watt safe maximum of any 40 watt switch (safe maximum = 40 amps x 80% = 32 amps)

Buy: 40 amp switch with 32 amp safe max
Motor switch
MS302 30 amp 2-pole switch

Buy 30 amp switch with 24 amp safe max:
30 amp motor switch
30 amp 2-pole switch
30 amp industrial grade
Leviton 3033 switch
30 amp 3-way switch
Override T101 timer Override T100 series timer with pilot light switch/ 15 amp load
Timer dial runs continuously as per normal operation
Switch turns Load ON when timer is off.
Switch cannot turn Load OFF when timer is on
Buy
T100 series timers
Cooper 277 pilot light switch
Twist on wire connectors
Southwire electric
Electricians tool kit

Resources:
How to wire pilot light switch
How to set and operate T100 series timers
Trippers and parts for T100 series timers
Match breaker and wire size with Load
Override T101 timer

Override T100 series timer with 120-240 volt spring-wound timer/ 20 amp load
Rating 2 HP at 120 volt, 1 HP at 240 volt
Timer dial runs continuously as per normal operation
Spring-wound timer turns Load ON when timer is off.
Spring-wound timer cannot turn Load OFF when timer is on
Buy
T100 series timers
Spring-wound countdown timers

Resources:
Spring-wound countdown timers and manuals
All T100 series timers and manuals
How to set and operate T100 series timers
Trippers and parts for T100 series timers
Match breaker and wire size with Load
Override T101 timer Override T100 series timer with digital countdown timer/ 15 amp load
Timer dial runs continuously as per normal operation
Digital countdown timer turns Load ON when timer is off.
Digital countdown timer cannot turn Load OFF when timer is on
Buy
T100 series timers
Leviton countdown timers
Maxxima countdown timers
Intermatic Ei200 series timer
Woods 59000 series at Amazon
Cooper countdown timers
Lutron MA-T51 series at Amazon
Tork professional SS series / 120-277 volt

Resources:
Compare countdown timers/ with manuals
How to set and operate T100 series timers
Trippers and parts for T100 series timers
Match breaker and wire size with Load
Intermatic RC939 controls timer       
Larger image             
        RC939 transmitter                               RC613 receiver                      WH40 or T104 timer    
Override T104 or WH40 timer with remote control/ Max 15 amp
Control 240Volt 3500 watt water heater using Intermatic RC 939 remote control and RC615 120Volt receiver
240Volt circuit can be turned off by turning off 1 hot wire
Do not exceed 15 amp rating of RC615, otherwise install RC613RC relay or PT1203M

Buy
RC939 3-channel radio transmitter at Amazon
RC613 receiver at Amazon

Resources:
Up to 100 feet away
RC939 transmitter manual
Remote receiver manual
Fuseholders
In home remote controls
T101 freeze thermostat Override T101 using 40 amp contactor and freeze thermostat
--A freeze thermostat or freeze switch will turn Load ON when temperature drops below 40°F, and then turn off when temperature rises again.
-Low cost way to turn on pool or irrrigation pump or heater etc when freezing temperatures are expected.
Note the contactor coil should be 120 volt, or same voltage as timer.
-When temperatur drops, then the freeze thermostat completes circuit to the contactor coil. Contactor coil pulls the switching terminals together, and overrides the timer, turning on the Load.
-Contactor is approx 2" wide, 2.3" long, and 2.6" tall.
-There is generally NOT enough space in the wiring compartment of T101 to add a contactor. The contactor must be installed inside an electrically rated enclosure.
Buy:
Freeze thermostat
Contactor 40 amp 120 Volt coil
Packard contactor
Mars 2-pole and 3-pole contactors
Terminal kit
Blue terminals for 16-14 wire
Separate enclosure
Resources:
Enclosures
Contactos and contactor wiring
T-101B clock motor 120 V
Buy:
WG1570 for 60 Hz 120 volt Amazon
T-101B change to 208-277
Change T101B timer into 240 Volt
Buy:
WG1573 for 60 Hz 208-277V
T-101B change to 480 Volts
Change clock motor to WG1573
Buy:
WG1576 for 60 Hz 480V at Amazon
Fix T101 120 volt timer with replacement clock motor ... or Change timer into different voltage by changing clock motor voltage
Intermatic clock motor >>>>> Intermatic clock motor
T-101B change to 24 Volts
CW190-10 for 24 volt 60 Hz 24V at Intermatic

T-101B change from 60Hz to 50 Hz
WG1571 motor for 50 Hz 120Volt at Intermatic

  Copper part of wire is completely covered
Twist-on wire connectors are very reliable, and withstand overamperage and severe conditions of residential electricity.
Applies to wires that are twisted together
Applies to wires that are placed sided-by-side
Applies to stranded and solid wires

Professional electricians twist size 10-12-14 gauge wires.
Larger gauge wires are not twisted together, but joined side by side.

Heavy amp wires or large gauge wires are connected side by by side... best is a lug connection.
Professional commercial wiring considerations are different than residential wiring in some ways because of higher amperage, more usage, and larger wires etc.
Resource
How to twist wire
Keep wires straight
Use solid copper wire
If wiring terminal or end of wire are covered with green, use emery board to clean terminal and sandpaper to clean wire.

Applies to timers, wifi etc/ info source Intermatic
Insdulation under screw plate
Larger image
Both wires MUST be same gauge
Straighten each wire 
If wire is corroded or overheated, clean the end with sandpaper and wipe with cloth.
If wire has been melted, cut back and reattach, or replace wire.
Tighten screw very tight against copper wire
 
Use wire connector  
Push on wire connectors
Use push-on wire connectors
3 wires/ or different gauge wires
Join wires with wire connector or push-on connector 
Run jumper to screw terminal. 
Buy:
Push on wire connectors at Amazon
Red 3P connector (shown) for 10-14 gauge wire
Connector assortment 
Resource:
How to select and install wire connector

Larger image
Fire safety/ Do not put stranded wire under screw plate
Problem1: picture shows 2 different gauge wires under screw plate
Problem2: Stranded wire will expand and contract and come loose under screw plate, even if it is the only wire under the screw plate.
Attach stranded wire and solid wire with connector, and run solid copper jumper wire to screw terminal

Resources:
Timer caught fire
Load ratings for Intermatic timers/ pdf
156T1961A tripper Trippers
Dial can have 12 sets ON-OFF trippers
Buy:
156T1978 trippers Amazon
124T1952 Insulator
Larger image

124T2411A insulator pk 25
Insulators
-Keep insulator over screw terminals to prevent accidental electrocution hazard.
Insulator pushes down over two knobs located on timer mechanism below the yellow dial.
Translucent
124T1948 single pole T101, T102, T105
124T1948 single pole T171, T172, T175
Buy:
124T1948 at Amazon

Black rigid
124T2411A  rigid
Buy:
At Amazon
2T2485GA enclosure Convert indoor timer into outdoor timer:
Buy different enclosure.
Use thumb spring located top inside timer to remove mechanism from enclosure
Buy:
2T2502GA beige plastic Outdoor box at Amazon

Resource
More enclosures
Installation tips
-Secure wire or conduit to enclosure. All wires, enclosures and conduit must be secured to structure.
-Always use solid copper wire under timer screw terminals ... stranded wire can come loose and cause fires.
-Keep enclosure door closed to prevent possible fire hazard from spreading.
-Keep insulator over screw terminals to prevent accidental electrocution hazard.
-Install enclosures away from hazards such as lawn mower or machinery.
-Install outdoor boxes in sheltered area if possible and 12" above anticipated snowfall.
-For safety, make sure Load is grounded correctly. People often forget to securely join the ground wires inside timer because wire sometimes gets a bit short. Buy extra length of wire from box store. Load must be grounded.
Resource:
Why you need ground wire
Use correct wire and breaker
Oversized is OK, undersized is hazard
Look at label on load to determined correct size wire and breaker
Watts divided by volts = amps
If Load is 120 volt, and watts is 1500 = 12.5 amps.
Next calculate 80% safe maximum. 20 amp breaker x .80 = 16 amps safe maximum
15 amp breaker x .80 = 12 amps safe maximum
The calculation shows that 4500 watt load requires 20 amp breaker and 12 gauge wire up to 150 feet.
Longer distance, use larger wire and breaker.
Buy from my affiliate links:
Southwire cable and tools
Resources:
Figure volts amps watts
Match wire and breaker size
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Contactors/ relays
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Programmable timers

Woods timers
surge protection
Anode rods anode rods
Recirculation system

Tankless recirculation
Point of use water heater
Type 1 and type 2 surge protection surge protection
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Electronic parts

Industrial supplies

Tools and home improvement

Home and garden

Hayward pool
Pentair pool

Southwire electric
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Tools

DEWALT
Black and Decker
Stanley
SKIL
Makita
Porter-Cable
Bosch

Irwin Hand tools
Klein hand tools
Fluke electrical testing
Dremel hobby tools

Campbell Hausfeld air powered
Tekton automotive

Powerbuilt automotive
Saws and saw blades
box timers Resource:
Compare box timers
DPDT timers
Intermatic
Control water heater w/ Z-wave
Intermatic control centers Resource:
Intermatic control centers: and parts
Digital control centers and parts
Tork control centers and parts
Subpanels
All control centers and parts
Enclosures
programmable timer Resource:
Programmable timers
Countdown timers
Off delay timers
On delay timers
Timer modules
Din rail
Twin & one-shot
Woods
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