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A qualified Coast Guard-approved marine drill instructor, Fred Mattera of Point Judith, RI is the owner\/president of North East Safety Training Co. (NESTCo), which conducts fishing vessel drills and inspections and basic safety training workshops. A commercial fisherman for 40 years, Mattera is a member of the Commercial Fishing Safety Advisory Committee to the Coast Guard, and, since 1998, has been president of the Point Club, a fishing vessel mutual insurance group. He also has served on the board of directors for Sunderland Marine Mutual Insurance Co., the principal underwriter for the Point Club and more than 2,000 US fishing vessels, since 1998.<\/p><\/div>\n
The downside, of course, is lost time and money.<\/p>\n
\nWhat can we learn? \u00a0<\/b><\/p>\n
This, unfortunately, is an often overlooked fire hazard that is always an overriding concern on boats.<\/p>\n
The use of portable electric heaters is very common in our fishing fleets and admittedly problems caused by them are rare \u2013 largely due to improvements in these heaters and the education of users.<\/p>\n
In this article, I will try to enhance and educate you further:\u00a0 It is my contention that electric heaters and extension cords can<\/i> be used safely, but only with proper precautions.<\/p>\n
\nHeater choices \u00a0<\/b><\/p>\n
The safest type of portable electric heater is the oil-filled radiator.\u00a0 The oil diffuses the heat across the entire surface so nothing gets hot enough to present a fire hazard.<\/p>\n
But these are the largest and most bulky of commonly found heaters and they depend upon convection for heat distribution.<\/p>\n
Ceramic heaters operate at lower internal temperatures than heaters that use wire grids.\u00a0 As such, they present less fire hazard than conventional heaters if tipped or if something accidentally comes in contact with the heater.<\/p>\n
All portable heaters should be equipped with an over-temperature switch and some also have a tip-over switch for additional safety.<\/p>\n
As a heat source with a small footprint, the ceramic heater is your best choice.\u00a0 Most have a fan to distribute the heat.<\/p>\n
The glowing infrared radiant heaters provide a warm fireplace-like glow and are inexpensive, but they are also the most dangerous.\u00a0 Any contact with flammable material will cause a fire.<\/p>\n
The quartz heater is basically one of the wire-wound radiant heaters with the element inside a quartz envelope, just one step above the old-fashioned type.<\/p>\n
I would refrain from using any radiant heater on a boat.<\/p>\n
\nHeater use \u00a0<\/b><\/p>\n
Operate electrical heaters away from combustible materials and do not use a heater to dry wearing apparel or boots (gloves, clothing) that could fall on the heater and trigger a fire.<\/p>\n
Never place electrical heaters on a table, bench, cabinet, or the like.<\/p>\n
Electric space heaters typically have a rating of 1500 watts, and a low setting of 750 watts, with a few having three settings.<\/p>\n
But those settings are based on the power used by the heater and do not tell you how much heat each unit makes for the power consumed.\u00a0 That is rated in BTU\u2019s and only a few give that information.<\/p>\n
When purchasing a heater, if it does list the BTU\u2019s produced, you want one that has the highest output for the 1500\/750 watts being used.<\/p>\n
The two designs that supply the most heat for the watts used are the oil-filled and the ceramic.<\/p>\n
\nPowering the heater<\/b><\/p>\n
Any electric heater will be drawing nearly the maximum rated load of a duplex outlet \u2013 possibly for an extended period \u2013 and be aware that boat sockets are not always of the highest quality.<\/p>\n
A heater should always be the only thing plugged into an outlet leaving the other half vacant.<\/p>\n
A slight warming of the plug while the heater is operating is normal, but if you notice any heating of the outlet itself, or if the plug gets hot enough to deform the plastic around the prongs, you have a wiring problem that must be addressed.<\/p>\n
If you replace an outlet, buy one in the mid to upper price range and from a known manufacturer, as they vary in quality.<\/p>\n
The same rules apply to your shore power plug.<\/p>\n
Safe use of the full capacity of your shore power is dependent upon all equipment being in good condition, which isn\u2019t always the case.\u00a0 You should examine the plug to be sure that it doesn\u2019t show signs of damage.<\/p>\n
If the outlet is not in good condition it isn\u2019t safe to use, especially when using heaters.\u00a0 It should not show signs of overheating, cracking, or weathering.<\/p>\n
One way to improve electric connections is by applying a small amount of dielectric grease (available at most home supply stores) to each pin of your power plug.<\/p>\n
A 30-amp circuit will be running at close to maximum capacity with two 1500 watt heaters.\u00a0 Add the other miscellaneous loads \u2013 like lights and appliances \u2013 and you are probably at or exceeding that limit.<\/p>\n
It is wiser to use only one heater, or use two in different locations, but with each set to the low settings.<\/p>\n
If you have a 50-amp power cord you can use two heaters safely at the same time.\u00a0 If you do, make sure that each one is on a different electric circuit.<\/p>\n
With 50-amp service, it is a good idea to install a separate circuit for each heater used.<\/p>\n
Install a 15-amp breaker into the distribution box for each, using 12\/2 wire, and install a single socket outlet for dedicated use on each heater.\u00a0 These dedicated outlets are usually orange in color to indicate that they are on a separate circuit.<\/p>\n
\nExtension cords, power strips<\/b><\/p>\n
When there is no place to plug in the electric heater, what do you do?<\/p>\n
You probably are tempted to use one or more extension cords to reach the nearest outlet, or add a power strip to get more outlets.<\/p>\n
Most of us don\u2019t think of this as dangerous, but the US Consumer Product Safety Commission declares extension cords among the most dangerous of electrical appliances.<\/p>\n
What\u2019s wrong with using an extension cord or power strip to run an electric heater and more electrical equipment?<\/p>\n
If too many pieces of electrical equipment are plugged into the same outlet and they are all on at the same time, more current may be running through the outlet than it can handle \u2013 creating an electric fire hazard.<\/p>\n
\nTips for safe use<\/b><\/p>\n
Here are several commonly experienced problems, and remedies, toward making onboard use of heaters and cords a safer proposition for vessel owners.<\/p>\n
\nOverloaded circuits and what to look for:<\/i><\/b>\u00a0 The outlet or wall is warm to the touch, the outlet is discolored, the circuit breaker frequently trips, and\/or a burnt smell of insulation is noticeable.<\/p>\n
Remedy:<\/i><\/b>\u00a0 An extension cord or power strip should only be plugged directly into an outlet (not into another extension cord or power strip, and not strung together in a series or \u201cdaisy-chaining\u201d).\u00a0 Extension cords without surge protectors are not recommended.<\/p>\n
Extension cords and cords from power strips (or surge protectors) being used for heaters and electrical equipment should not be run under rugs or carpet.\u00a0 The heat build-up is a potential fire hazard.<\/p>\n
\nOverloaded extension cords can cause an electrical fire and what to look<\/i><\/b> <\/i>for:<\/i><\/b>\u00a0 <\/i>Extension cord is warm to the touch, discolored, or has a burnt smell.<\/p>\n
Remedy:<\/i><\/b>\u00a0 Make certain the extension cord ratings are at least as high as the heater or appliance they power.\u00a0 Best to use an extension cord with the same or larger wire size as the heater\/appliance cord.<\/p>\n
Consider the load \u2013 remember an electric heater draws more than a light bulb \u2013 and consider the distance from the outlet.\u00a0 Use the shortest length of extension cord possible to minimize current loss or heat build-up.<\/p>\n
Per the American Wire Gauge (AWG) system, the smaller the wire gauge number the more current the cord can safely handle.\u00a0 For example and extension cord made from 12-gauge wire can safely handle more current than an extension cord made from 16-gauge wire.<\/p>\n
Unwind\/uncoil the extension cord fully before use to prevent heat build-up.\u00a0 Also, since an extension cord is designed for temporary use (90 days or less) it is best to run a dedicated circuit and\/or install well-located three-wire grounded outlets to minimize the need for extension cords.<\/p>\n
\nElectrical shock from a short circuit due to ungrounded outlets and what to look for:<\/i><\/b>\u00a0 An electric heater or equipment cord has a three-prong plug, but the nearest outlet only has two slots for the plug.<\/p>\n
Remedy:<\/i><\/b>\u00a0 Never remove the ground (third) prong of a three-pronged extension cord or attempt to insert it into an ungrounded (two-pronged) outlet.<\/p>\n
Grounding is a method to protect individuals from electrical shock by providing an intentional low-resistance path from the electrical system to the earth with sufficient current-carrying capacity to prevent the buildup of hazardous voltage.<\/p>\n
Cord and plug-connected equipment must be grounded if located in a hazardous wet environment, or if operated at more than 50 volts.<\/p>\n
Only use electrical extension cords listed by Underwriters Laboratories (UL).<\/p>\n
\nElectrical shock from damaged extension cords and what to look for:<\/i><\/b>\u00a0 Watch for damaged extension cords that have been knotted or kinked (causing the wire to break internally) frayed, cut, or burned.<\/p>\n
Also, be observant of extension cords running through walls, under carpet or furnishings, through doorways, across walking paths, or that are draped over electrical equipment.\u00a0 These all can become easily damaged.<\/p>\n
Remedy:<\/i><\/b>\u00a0 Inspect extension cords for wear and damage before use.\u00a0 Remove extension cords by pulling on the plug instead of the cord.\u00a0 And damaged extension cords should be destroyed and discarded.\u00a0 Avoid repaired cords \u2013 these are a weak link.<\/p>\n
\nElectrical shock from extension cord contact with water and what to look for:\u00a0 <\/i><\/b>Watch for electrical outlets within 3\u2019 of sinks or other water sources; and that are outside, across a wet deck.<\/p>\n
Remedy:<\/i><\/b> \u00a0 Extension cord use near sinks or wet environments should be plugged into an outlet with Ground Fault Circuit Interruption (GFCI) or you should use a supplemental GFCI to prevent an electrical shock.<\/p>\n
Ensure that the only extension cords you use outdoors are rated for outdoor use with a built-in or supplemental GFCI.<\/p>\n
\nIn conclusion \u00a0<\/b><\/p>\n
Hopefully, these safety tips on electrical heaters and extension cord use will heighten your awareness \u2013 and prevent a fire hazard on your vessel \u2013 as this year\u2019s cold weather season winds down.\u00a0 File them away for next winter \u2013 it will be here before we know it.<\/p>\n
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